hybridfree/eevblog-posts huggingface dataset:
Identifying LED driver for replacement - Page 1
Forum section: electronics / repair

author: Shaky
author_rank: Newbie
timestamp: March 18, 2024, 12:37:39 pm
content: Hi. I wonder if someone could assist with suggesting a replacement driver for one of my Screwfix brand LAP LED battens please ?I've looked online, typing the PCB No's into Google but haven't been able to find a manufacturer unfortunately. I've stripped the one of the other batten's down and there appears to be a total of 320 smd LED's inside (I'm guessing 3528's judging by their size) which are grouped in 8 parallel units of 40 LED's each.I checked the voltage across the strip terminals of the working unit and I got 120v thereabouts if that helps ?It just seems daft to me that there doesn't seem to be an option from LAP to replace the driver, just throw the old unit into landfill !I have seen some drivers for sale that quote 50W and round-about the same voltage for around £10-£15 but I don't want to commit to buying until I'm certain it'll be OK, so any assistance would be gratefully received - thanks. I've attached a couple of pics.

author: Shaky
author_rank: Newbie
timestamp: March 20, 2024, 07:41:20 pm
content: Do I take it from the lack of any reply that a new Batten is the only way re: this ?

author: BrokenYugo
author_rank: Super Contributor
timestamp: March 20, 2024, 07:58:10 pm
content: Match wattage and make sure operating voltage is in range, avoid no name import stuff for safety and reliability, make sure you get the polarity right connecting the new one, pretty sure that's all there is to it.

author: fzabkar
author_rank: Super Contributor
timestamp: March 20, 2024, 08:53:28 pm
content: I would try to identify IC1 (I can't read the markings). Hopefully the circuit is based on an application diagram in the IC's datasheet. That should tell you what the circuit is doing, and might help you find an appropriate replacement.

author: Shaky
author_rank: Newbie
timestamp: March 21, 2024, 06:08:23 pm
content: Quote from: BrokenYugo on March 20, 2024, 07:58:10 pmThanks for thatI've managed to source a unit from a manufacturer called Helvar which seems to fit the bill OK. 350mA drive current and can provide up to 200VDC so hopefully it should be fine.Quote from: fzabkar on March 20, 2024, 08:53:28 pmI'll see if I can get a better pic off one of the other units's driver that hasn't been burnt out.

author: Shaky
author_rank: Newbie
timestamp: March 27, 2024, 02:49:02 am
content: Just thought I'd post back with an update. Found a guy on eBay selling some 2nd hand Helvar LL1x70-E-CC Adjustable Constant Current Drivers, four of them for £15 so I thought I'd take a punt. Set them up for 350mA & 120V, the result is I now have a working LED Batten again & 3 spare working drivers if I ever need 'em for 'owtI did have to swap-out a couple of LED's that'd blown that I noticed once I tested it with the new driver but no biggy and I've saved £25 for the sake of about an hour and half of my time."I'm sorry sir, these units have no user replaceable parts".............PAH
Identifying LEDs on this swimming pool light - Page 1
Forum section: electronics / repair

author: aroby
author_rank: Regular Contributor
timestamp: September 26, 2023, 06:06:48 pm
content: One of my Pentair MicroBrite pool lights has failed LEDs and drivers. I'm not sure how best to go about identifying the LEDs. They are roughly 3mm square and are very bright. Does anyone by chance recognize these or can suggest how I figure out what they are?ThanksAnthony

author: u666sa
author_rank: Frequent Contributor
timestamp: September 26, 2023, 10:42:59 pm
content: Just search ali for led --https://aliexpress.ru/item/1005004835997844.htmlYou first need to identify voltage, use some needle nose multimeter probes with your power supply, give it 3 volts, if not working then 5 volts, etc.. Buy proper voltage, high power.

author: aroby
author_rank: Regular Contributor
timestamp: September 27, 2023, 08:55:48 pm
content: Quote from: u666sa on September 26, 2023, 10:42:59 pmI can't get any connection with probes, plus it's impossible to see when the LEDs light up, they are so bright!

author: u666sa
author_rank: Frequent Contributor
timestamp: September 27, 2023, 09:02:15 pm
content: Assume they are 3.5 volts then. You can fix them right now without ordering anything. Use any old none light diode instead of your burned light diodes and get the circuit working. Though, you should identify which iodes are burned, either with microscope or needle nose probes and PSU.

author: tunk
author_rank: Super Contributor
timestamp: September 27, 2023, 09:26:17 pm
content: Depending on the input voltage each "LED" could have 1, 2, 3 ... LEDs in series.It could be this chip:https://www.farnell.com/datasheets/1904411.pdf

author: aroby
author_rank: Regular Contributor
timestamp: September 27, 2023, 09:37:22 pm
content: Quote from: tunk on September 27, 2023, 09:26:17 pmYes, that's the driver. I need to order a few, since at least one appears to be bad. Each driver drives 3 LEDs. I also need to figure out the type / value of the diode with the CA marking. 3 of them show 0.14v when tested with a meter, the 4th is open. Unfortunately the 1362 datasheet doesn't make any mention on values for that!
Identifying QFN16 3x3 mm buck DC-DC Li-ion charger - Page 1
Forum section: electronics / repair

author: martonmiklos
author_rank: Contributor
timestamp: September 19, 2023, 08:49:13 pm
content: Hi folks,I am trying to repair a Braun Silk Epil 9 series motherboard.The on board single cell Li-ion DCDC charger IC looks to be defective.It runs from 12V, and when it starts charging it brings my bench PSU CC.I have drawn a reverse engineered symbol for it, does anyone could identify it?I used up all my google fu with qfn16 li ion and dcdc keywords, but I have not found any pinout compatible one.The markings on the IC:4561190932144

author: fzabkar
author_rank: Super Contributor
timestamp: September 20, 2023, 11:17:47 pm
content: Perhaps if we could identify the other ICs, this may help us to determine the manufacturer, or at least the country of manufacture.BTW, the second line appears to be a YYWW (year/week) date code. I have confirmed this by examining other PCBs.

author: thm_w
author_rank: Super Contributor
timestamp: September 21, 2023, 12:08:27 am
content: Does the output go directly to a single lithium cell? Or does it pass via another IC.If there is space bodge in a TP5100 or similar charging module. Or convert to USB and use TP4056.

author: martonmiklos
author_rank: Contributor
timestamp: September 25, 2023, 08:11:40 pm
content: There are not much identifiable parts on the board other than the MCU (made by Cypress).There are two BC847BS on the board the rest of the IC-s/transistors are not identifiable.

author: martonmiklos
author_rank: Contributor
timestamp: September 25, 2023, 08:16:01 pm
content: The output is connected to the li-ion cell through a fuse.There are some status reporting wired to the MCU which needs to be reverse engineered.Before the IC removal the device indicated charging (with a LED blink code) without charger connected (the device cannot be operated during charging). When I shorted out the charging input pins it got functional. After the IC removal I cannot turn it on.

author: fzabkar
author_rank: Super Contributor
timestamp: September 25, 2023, 08:19:59 pm
content: Try asking at ...https://www.badcaps.net/forum/forumdisplay.php?f=29
Identifying smd part of Korg Taktile PSU - Page 1
Forum section: electronics / repair

author: base
author_rank: Newbie
timestamp: July 16, 2025, 10:05:26 am
content: Hi, I am trying to repair a Korg Taktile, but unfortunately have no schematic of it. Usually I do not have much trouble identifying parts but this one is unclear to me.We have a USB to 3.3V PSU here and what seems to be a LED driver (5121R). In between is a 6 pin sot-23 (or similar) cased part marked F1 on the silk and TR on the casing. When USB is connected IC1 generates a nice 3.3V but I did not measure anything beyond F1.Attached are 2 photo's from each side of the PCB regionDoes anyone have a clue what device this can be?

author: coromonadalix
author_rank: Super Contributor
timestamp: July 16, 2025, 10:10:50 am
content: does it look like that ? mostly for the F1 part ?https://syntherjack.net/korg-microkorg-repair/mocrokorg-schematic-psu-syntherjack/https://fixingelectronics.blogspot.com/2014/04/korg-triton-le-power-supply-issues.html

author: base
author_rank: Newbie
timestamp: July 16, 2025, 10:30:39 am
content: @coromonadalix yes pin 1,2,5,6 are connected, gate seems to go to the cpu, so going to check it and IC3 (marked CM5), thanks!(board is a KLM-3210 btw)

author: coromonadalix
author_rank: Super Contributor
timestamp: July 16, 2025, 10:47:12 am
content: the hard part is following voltagesF1 act as a switch

author: base
author_rank: Newbie
timestamp: July 16, 2025, 10:54:42 am
content: Well the GS voltage is 0V so it's definitely not switching onCPU does seem to get 3.3V and gate seems to be driven by a CPU pin. Wil have to do some more checks to find out why it's not turning on.
Identifying SMD part - Page 1
Forum section: electronics / repair

author: Red_Micro
author_rank: Regular Contributor
timestamp: February 23, 2020, 06:26:12 pm
content: I can't find anything related to this part. The SMD marking is D8H9A and the package is SOT23. It looks like a MOSFET to me, but not 100% sure without the datasheet. It's shorted and I have other boards with the same part burned.

author: WattsThat
author_rank: Frequent Contributor
timestamp: February 26, 2020, 02:28:22 am
content: Not sure, maybe IRLML5103. Can you determine if it is a P channel device on good board?https://www.infineon.com/dgdl/irlml5103pbf.pdf

author: PA0PBZ
author_rank: Super Contributor
timestamp: February 26, 2020, 02:01:53 pm
content: Maybe this one?https://www.vishay.com/docs/71796/si2328ds.pdf

author: testpoint1
author_rank: Frequent Contributor
timestamp: February 26, 2020, 02:04:47 pm
content: yes, it is a MOS FET,Si2328DS N-Channel 100 V (DS) MOSFET - Vishay
Identifying SOT-23-3 with 351A= markings - Page 1
Forum section: electronics / repair

author: pcwrangler
author_rank: Regular Contributor
timestamp: October 12, 2023, 05:59:00 pm
content: Can anyone help me identify this smd part? I tried an N channel Mosfet with no luck. Can't find it in any of the typical databases.

author: fzabkar
author_rank: Super Contributor
timestamp: October 12, 2023, 06:34:55 pm
content: NDS351AN, Onsemi, N-Channel, Logic Level, PowerTrench MOSFET, 1.4A, 30V, SOT-23:https://www.onsemi.com/pdf/datasheet/nds351an-d.pdfhttps://www.aliexpress.com/item/1005004473885435.html(photo)
identifying the element - Page 1
Forum section: electronics / repair

author: mich4d09
author_rank: Newbie
timestamp: December 03, 2024, 07:24:26 pm
content: Hello guys, I have a problem that I wanted to solder a 5-pin USB-C connector to this board, but I accidentally desoldered other elements. The missing elements are pointed with blue and red selection. I know what the elements marked in blue are, and they both have 3 legs, I wrote their names above. but the elements marked in red have 2 legs and I don't know what they are. The element in the white circle is burned down and i want to replace it, but I don't know what this is and it says M05 on it, can someone identify this element? Coming back to the red markings, all I can say is that the board comes from an vape and after inserting the battery, it turns on but shows 0% all the time. Can someone help me? I will be very grateful. If you need different or better quality photos, I can send them.

author: fzabkar
author_rank: Super Contributor
timestamp: December 03, 2024, 07:58:16 pm
content: http://markingcodes.com/search/c/m05http://markingcodes.com/search/c/24
Identifying the value / type of a diode - Page 1
Forum section: electronics / repair

author: aroby
author_rank: Regular Contributor
timestamp: September 27, 2023, 09:14:53 pm
content: How can I go about identifying the value of the diode with the CA marking in this photo? There are 4 of them on the board, testing with a meter shows 0.14v across 3 of them and the 4th has failed. They are tiny - I think an 0802 size.Their use is in the circuit with the 1362 LED driver. I'm not sure if this is a zener or a Schottky diode, the datasheet for the 1362 makes no mention of it, it just shows it on the circuit diagram!

author: Kim Christensen
author_rank: Super Contributor
timestamp: September 27, 2023, 09:54:47 pm
content: The symbol on the datasheet diagram is for a Schottky diode. Maybe it's aPMEG6010CEHor similar.From page 20 of the datasheet:Quote

author: fzabkar
author_rank: Super Contributor
timestamp: September 27, 2023, 10:01:08 pm
content: From the same page in the datasheet ...Quotehttps://www.diodes.com/assets/Datasheets/ds30487.pdf

author: aroby
author_rank: Regular Contributor
timestamp: September 28, 2023, 02:28:16 pm
content: Thanks all, I completely missed the paragraph in the datasheet! The suggested diode isn't the one (wrong form factor), but I did find a candidate - Nexperia PMEG2020EJ - that seems to have suitable parameters, is available in the SOD323F form factor and has the CA marking. Hopefully this gets me back in action!Thanks again.
Identifying this switch on a Bluetooth headset - Page 1
Forum section: electronics / repair

author: ishyesh
author_rank: Newbie
timestamp: January 05, 2024, 06:17:23 pm
content: Hey y'all, I'm trying to replace a switch but am having a hard time finding what it is. Google Lens search got me closest but no part number. This is an Alpatronix HX200.This switch is one that can be pushed in, or rotated forward or backward. It seems surface mounted.

author: tooki
author_rank: Super Contributor
timestamp: January 05, 2024, 07:48:47 pm
content: It’s probably a no-name Chinese clone, but I think Alps, Omron, and Panasonic make (or used to make) those things.

author: wasedadoc
author_rank: Super Contributor
timestamp: January 05, 2024, 07:54:23 pm
content: Perhapshttps://www.aliexpress.com/item/4000946822824.html

author: ishyesh
author_rank: Newbie
timestamp: January 05, 2024, 10:08:15 pm
content: Thank you both! It's just the hint I need to find a suitable replacement!
Identifying TO-220 device - Page 1
Forum section: electronics / repair

author: Red_Micro
author_rank: Regular Contributor
timestamp: February 27, 2020, 01:56:47 pm
content: Hi,I don't find info regarding the device with this marking: 368-02. See the images attached. For me it's either a transistor or SCR for the way it's used in the circuit. Any ideas?
Identity help with a Motorola transistor - Page 1
Forum section: electronics / repair

author: xwarp
author_rank: Frequent Contributor
timestamp: May 15, 2021, 08:11:42 pm
content: My google-fu seems to be broken and I'm having a hard time finding any info about this Motorola transistor in an old audio power amplifier that schematics are not available for.Any help would be appreciated.

author: floobydust
author_rank: Super Contributor
timestamp: May 15, 2021, 08:14:31 pm
content: Looks like good oldMJE2955T

author: andy3055
author_rank: Super Contributor
timestamp: May 15, 2021, 08:53:22 pm
content: Here is the data:

author: xwarp
author_rank: Frequent Contributor
timestamp: May 15, 2021, 09:30:34 pm
content: Thanks!
IEC 60320 C13/C14 (PC power cord) live, neutral, earth? - Page 1
Forum section: electronics / repair

author: mcovington
author_rank: Regular Contributor
timestamp: November 21, 2022, 08:23:39 pm
content: Is there a standard that says which pins of an IEC 60320 C13/14 (PC power cord) are live and neutral? Earth is obvious, but I haven't been able to find the spec for the other two.

author: alm
author_rank: Super Contributor
timestamp: November 21, 2022, 08:28:15 pm
content: Given the plug at the other end of the cord is not guaranteed to be polarized, I think the only sensible way to design a device with an IEC power input is to work with either polarity.

author: mcovington
author_rank: Regular Contributor
timestamp: November 21, 2022, 08:33:58 pm
content: So I saw, in this thread:https://www.eevblog.com/forum/beginners/iec-plugsocket-live-vs-neutral/My approach to safety might be provincially North American. We have polarized outlets here.I am also going to investigate the rumor that the polarization of IEC power cords varies randomly.

author: Andy Watson
author_rank: Super Contributor
timestamp: November 21, 2022, 09:11:21 pm
content: They are not randomly polarised. Some have single pole switches and/or fuses which should correspond to the live connection. Re-wireable connectors are usually labelled. Here's one that was to-hand:

author: mcovington
author_rank: Regular Contributor
timestamp: November 21, 2022, 09:52:40 pm
content: Thanks. That agrees with 3 cords that I just tested with a continuity tester (I added a red dot marking live):

author: coromonadalix
author_rank: Super Contributor
timestamp: November 23, 2022, 11:58:37 am
content: Good testing, we had some china crap wires who where phases inverted, they dont care about north america polarized outletsCreated some stange problems for an non isolated power supply (Pwm based) ??
IET Labs / GenRad 1689M - missing schematics - Page 1
Forum section: electronics / repair

author: abaumgaertner
author_rank: Newbie
timestamp: October 17, 2016, 09:04:41 am
content: looking forward to repair a GenRad 1689MDoes anyone have the schematics?User and Service Manual is available from IET LABS but they left out the last 20 pages containing the schematics.Last Page is 6-6, should be 6-26 accoring to the index.I contacted ietlabs already - no response ...Links:User and Service Manualhttp://www.ietlabs.com/pdf/Manuals/1689_im.pdfDatasheethttp://www.ietlabs.com/pdf/Datasheets/1689.pdfThanks!

author: Vgkid
author_rank: Super Contributor
timestamp: October 17, 2016, 05:39:01 pm
content: http://exodus.poly.edu/~kurt/manuals/manuals/Other/Look at the 2manuals for the 1659/1689. Circuits are the same.

author: abaumgaertner
author_rank: Newbie
timestamp: October 18, 2016, 12:47:56 am
content: Thanks a lot ... really appreciate it.Man - this is quite a collection

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 06, 2023, 12:05:54 am
content: Any help?These have programming data for the custom PALs and PROMs in them as well!Chris Williams
IF adjustment special screw driver HP/Agilent/Keysight  8710-0772 - Page 1
Forum section: electronics / repair

author: tchiwam
author_rank: Regular Contributor
timestamp: June 14, 2023, 12:19:18 pm
content: Can someone give me the dimensions for this ? Pictures or where to get one maybe superseded number ? Is it isolated or just a metal shaft etc ?I'll try to resin print one... Right now my best bet are sewing needles ..

author: Jwillis
author_rank: Super Contributor
timestamp: June 16, 2023, 03:53:38 am
content: Have you got a picture of the screw that needs adjusting? There are Alignment Trimmer Tool Set kits available. Made from nylon I think.
If this isn't heatsink paste, then what is it? - Page 1
Forum section: electronics / repair

author: paul8f
author_rank: Regular Contributor
timestamp: May 28, 2019, 09:33:21 pm
content: Hoping somebody might know what this substance is needed for (please see photos).Just repaired an old DELL laptop power supply adapter (high ESR 'Ltec' electrolytics...)To do the work I had to use a scalpel to cut away some of this flexible white material. At first I thought it was simply thermal paste, but there was so much of it used, together with the fact that it was not still wet (or gone dried & crusty over time) like regular silicon heatsink compound.The main bulk of it was used near the small chopper transformer. Could it be possible that this white material was to "bulk out" some of the internal space to make the power adapter more resilient to bumps and vibration (it is used with a portable device after all...!)? Thanks.

author: paul8f
author_rank: Regular Contributor
timestamp: May 29, 2019, 05:27:45 am
content: Quote from: blueskull on May 28, 2019, 09:42:58 pm- I'd never heard of this stuff. So it's like a PCB-safe silicone sealant that hold components in place during the manufacturing process? I'm guessing its thermal transfer properties are nowhere near as good as heatsink paste?

author: Berni
author_rank: Super Contributor
timestamp: May 29, 2019, 05:49:07 am
content: Yep its essentially silicone safe for electronics useIt doesn't really provide much of a thermal advantage and its usually put on after the board has been manufactured and cleaned. The main purpose of the stuff is to glue together tall bulky components to make them resistant to vibration and impact.Its very commonly used in power supplies, most often on large electrolytic capacitors because those tend to be the bulkiest components on a board that sit only on two pins. This gives them a tenancy to wiggle cross axis to those pins and you can actually remove a capacitor from a board by simply grabbing it and wiggling it back and forth a few dozen timed until the pins break. The glue keeps the capacitors from wiggling like that.

author: paul8f
author_rank: Regular Contributor
timestamp: May 29, 2019, 08:33:58 pm
content: Thanks for all the help. I went to the Farnell website and did a quick comparison between a Silastic product and a Servisol product:SILASTIC® 9161 RTV - Silicone Elastomer. Thermal conductivity =0.25 W/mk.200001000 - Heat Sink Compound, Highly Conductive, Silicone tube. Thermal conductivity =0.77W/mK

author: paul8f
author_rank: Regular Contributor
timestamp: May 29, 2019, 08:44:18 pm
content: I didn't remove much of this Silastic stuff during the repair. Most of it is still in place.It's a 90 watt power supply, so gets fairly warm during normal operation. Would the integrity of the unit, or the lifetime of components be reduced by not re-applying the Silastic that got cut out?

author: David_AVD
author_rank: Super Contributor
timestamp: May 29, 2019, 09:30:27 pm
content: As others have said, the silicone is there as a purely mechanical function.
if unplug the parallel wire of front panel, will the machine fail on self test - Page 1
Forum section: electronics / repair

author: youxiaojie
author_rank: Newbie
timestamp: June 03, 2020, 05:10:41 am
content: dear friend,if we unplug the parallel, will machine stop at test failed step? I don't know it is my mother board damaged or front panel damaged. machine has problem of round reboot when I plug front panel, unplug keyboard, the machine can boot to diagnosis ui and show fail ++ front panel .how can I decide mother board broken or keyboard damaged. thanks. my oscilloscope is 754D.
If you've got a Mastech MS8050.... - Page 1
Forum section: electronics / repair

author: PureZX
author_rank: Newbie
timestamp: September 13, 2017, 11:26:20 pm
content: ...then hello,Could you please open it up and tell me what value the fried resistor is in the attached photo....I got this meter off eBay. It was sold as working but wasn't, obviously. Didn't pay a lot for it and I'm not sure if I want to return it for a refund or keep it and repair it.Thanks

author: ModemHead
author_rank: Frequent Contributor
timestamp: September 14, 2017, 02:43:46 am
content: Quite a dilemma. Help someone in need, or never admit in public that I have one of these things. Oh well. It did take 15 minutes just to recover it from underneath the rubble.In this unit, the smaller ones are all 470 ohms, the two larger ones are both 18K.

author: PureZX
author_rank: Newbie
timestamp: September 14, 2017, 03:06:11 am
content: Thank you.There can be no shame in helping others but let me distract the masses by letting everyone know that I also have a Maplin function generator. I can't resist a cheapie. If the price is low enough, I'll have it. I may not use it, but I'll have it.

author: ModemHead
author_rank: Frequent Contributor
timestamp: September 14, 2017, 03:29:38 am
content: Sorry, no offense intended to you for having one.I just never liked mine, it was too "drifty", never the same reading twice. Then I grew to dislike Mastech products in general.

author: retiredcaps
author_rank: Super Contributor
timestamp: September 14, 2017, 03:58:23 am
content: Does RF silk screened onto pcb imply Resistor Fusible?

author: ModemHead
author_rank: Frequent Contributor
timestamp: September 14, 2017, 01:40:50 pm
content: Quote from: retiredcaps on September 14, 2017, 03:58:23 amThey all look like plain old 1% metal-film resistors to me, although their position in front of the spark gaps seems like a good location for fail-safe parts. The meter is labeled CAT II 1000V. The blown-up resistor is in series with a 0.047 cap, so it might be some sort of frequency compensation. The specs say 20kHz bandwidth. Maybe it was subjected to some high-powered RF signal for the fireworks.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 13, 2020, 11:25:24 pm
content: Reviving this thread ...Just found thisIt's a rebranded PeakTech 4000 meter and a service manual is availableyou'll be / should be able to repair the input resistors when they blow ??

author: coromonadalix
author_rank: Super Contributor
timestamp: August 14, 2020, 11:18:00 am
content: Calibration manual PeakTech 4000 same as the Mastech Ms8050Not sure if all meter based on the FS970X chipset can be calibrated the same way ??will be pushed to Ko4bb website
IFI M5300 Wideband Amplifier - Page 1
Forum section: electronics / repair

author: comsec22
author_rank: Contributor
timestamp: May 16, 2023, 08:58:12 am
content: I bought the original manual from USA.. very poor contents and no cheap (almost 100 $).I am looking for the value for the final stages transistors (Q4 and Q6) .. in the manual, there is not a part list,no descriptions for the alignments..Issues are related, to some burned resistor across the base and collector of Q4 e Q6... and bandwidth is limited to 1.5 Mhz only !Any tips ?
IFR (Marconi/Aeroflex) FM/AM/1500 - Page 1
Forum section: electronics / repair

author: TheMG
author_rank: Frequent Contributor
timestamp: December 18, 2022, 08:40:06 pm
content: Was using it normally today and suddenly it just shut off and unable to turn it back on. Found the DC fuse had blown (was powering it from AC at the time, the AC fuse did not blow, but the DC fuse which is in-line with the built-in power supply is the one that did).Put another fuse in, the unit powered up for a few seconds (LEDs coming on and relays clicking as it would during its normal power-on process), then the fuse blew again.So I connected a bench power supply to the DC input jack, put a new fuse in and briefly powered on the unit to measure the current - 12A!!! The fuse (verified it's the correct rating) is a 7.5A fuse so no wonder it was blowing.Something, somewhere, inside this device is drawing an abnormally high amount of current, or a power supply voltage has risen to higher than normal.Problem is, I have been unable to find suitable troubleshooting information or schematics. The only copies of the maintenance manual I could find online (that aren't behind a paywall) seem to have the troubleshooting and schematics sections missing.Pretty hard to figure anything out without at least schematics, I don't even know what all the power supply voltages are supposed to be or anything, and it is not silkscreened onto the PCB anywhere.Anyone have a copy of the full maintenance manual or a link to where I could get one (no paywalls!)?

author: Andy Watson
author_rank: Super Contributor
timestamp: December 18, 2022, 09:07:47 pm
content: Have you tried:https://elektrotanya.comSearch for "ifr 1500". The version that has 669 pages appears to have schematics in it plus the sections that are missing from the 237 page version.

author: TheMG
author_rank: Frequent Contributor
timestamp: December 19, 2022, 12:41:49 am
content: Keep forgetting about that site for some reason. Thanks!Looks like the power supply has gone open-loop.5V is sitting at 6.7V, 12V is sitting at 16.5V. Unloaded the 5V skyrockets to 14V!Come to think of it, the fan did seem louder than usual during the few minutes that it was on before the first time the fuse popped. I really hope nothing got fried especially in the 5V digital logic.Step 1: repair power supply.

author: George Edmonds
author_rank: Frequent Contributor
timestamp: December 19, 2022, 01:50:58 am
content: HiUser group at.https://groups.io/g/IFR-MonitorsThis is the place to ask for help.G Edmonds

author: TheMG
author_rank: Frequent Contributor
timestamp: December 19, 2022, 03:27:37 am
content: R53, 4.75k resistor in the feedback loop, completely open. No signs of physical damage or overheating (which is virtually impossible as this resistor would never see anywhere near to its 1/4W rating).Replaced the resistor and now the power supply behaves as it should and outputs proper voltages.Luckily, so far everything seems to work, so I think I got lucky and nothing got fried by the over-voltage.
IFR 2023A hack to 2.4 Ghz - Page 1
Forum section: electronics / repair

author: AlcidePiR2
author_rank: Regular Contributor
timestamp: July 03, 2020, 08:29:48 pm
content: As I just repaired my IFR2023A,https://www.eevblog.com/forum/repair/marconiifraeroflex-2023-2024-2025-repair-advice-error-502-fractional-n-loop/I read in the doc that the 1.2 Ghz limit is only software limited.Is there a way to hack the IFR2023A to 2.4 Ghz ?Thanks
IFR 2392A 2390A 2393A lost callibration - Page 1
Forum section: electronics / repair

author: sako
author_rank: Newbie
timestamp: September 11, 2024, 07:30:18 pm
content: Hello,Could someone post pictures of their calibration values. The magic number that is needed to go into calibration menu is: 111846 or 020546 or 040166Story:I recently bought IFR 2390A that should work. Unfortunately it was broken.After some playing with it, and going into wrong rabbit hole: I thought that DAC is broken, because signal going into ADC board was out of range (-10V), and even embedded oscilloscope was not working. Disconnecting cable form DAC board going into ADC board was causing to plot straight line on 0V in oscilloscope mode like it should. But after confirming that DAC was working correctly (I reversed communication protocol between CPU board and DAC board. So I could control DACs independently). I found another problem.Currently I measured batteries that are on CPU board (should done this earlier) and one of them have 0V.Before replacing battery i looked into calibration parameters and they were random numbers. After replacing battery and configuring DAC values in SCOPE mode I have functional oscilloscope but there is so many parameters and I don't have starting point. Could someone post pictures from RAW CAL menu.
IFR 2394A Spectrum Analyzer - Page 1
Forum section: electronics / repair

author: 2e0vpx
author_rank: Newbie
timestamp: September 04, 2023, 02:28:06 pm
content: Does anyone have, or know how I might obtain, the password or code into the operating system for this analyzer in order to perform a factory reset? This machine had some electrical faults which have now been repaired but a factory reset is now required and for that, a password/code is required. The serial number is 110023004 (I think that may be required). I have been trawling just about every where I can find for this but have thus far drawn a blank.

author: Swake
author_rank: Frequent Contributor
timestamp: September 05, 2023, 06:43:46 pm
content: I know nothing about that thing but ran a small search on the web and it returned the following. you've nothing to loose trying these.CSMATE1234123456239401539172722379082732978085856767If you think it is serial number based then it must be somehow stored on that machine. You could read the (E)EPROM and search from there ?Have you tried contacting the manufacturer, maybe they are willing to help?
IFR 2975 NO DISPLAY/VIDEO - Page 1
Forum section: electronics / repair

author: wiredwrx
author_rank: Contributor
timestamp: February 14, 2023, 10:26:54 pm
content: Hello,Just bought a 2975 knowing there was a display issue. When powered on, the backlight comes on, but nothing is displayed and nothing beeps, but the leds inside the unit light up, and it looks like the PS leds are all on. I can't tell if it's booting, or attempting to boot, though based on the lack of beeping, I don't think it is actually booting. I connected the unit to an external VGA monitor, and while the monitor acts like it is getting a signal, nothing is displayed on the external monitor either. Can anyone suggest some first steps to figure out what is going on and to diagnose this thing? Any help is greatly appreciated.TIAMichael

author: George Edmonds
author_rank: Frequent Contributor
timestamp: February 14, 2023, 10:52:00 pm
content: HiThe service manual can be found on the internet as a free downloadThere is a dedicated user group at,https://groups.io/g/IFR-MonitorsG Edmonds
IFR 8000 Spectrum Analyzer - Page 1
Forum section: electronics / repair

author: maurit
author_rank: Contributor
timestamp: April 05, 2024, 09:26:36 am
content: Hi, I need help with my IFR 8000 Spectrum Analyzer.Symptom: The keyboard does not respond to any commands,1) I checked the power supplies and they are OK2) I disassembled the keyboard, cleaned the keys and they are OK3) I checked the flat cable and it is OK4) I changed the C-Mos Battery on the CPU boardonly the encoder that acts on the frequency setting works.Some advice ?Thanks in advance.Maurizio

author: CaptDon
author_rank: Super Contributor
timestamp: April 05, 2024, 03:50:44 pm
content: If any PLL is unlocked the keyboard will appear dead. Are any of the Red LED PLL fault lights lit?

author: maurit
author_rank: Contributor
timestamp: April 10, 2024, 10:15:04 am
content: Hi,I don't know where the red LEDs of the PLLs are located,I haven't found any documentation for this analyzer.Can you give me some suggestions?They tell me there is a procedure to follow when changing the backup battery.I do not know her.maurizio

author: korlatos
author_rank: Regular Contributor
timestamp: April 11, 2024, 08:57:35 pm
content: I am not sure about the A-8000, but on A-7550, which is almost identical, you need to perform a reset procedure after the battery replacement. The procedure is explained in the attached image.

author: maurit
author_rank: Contributor
timestamp: April 13, 2024, 03:08:26 pm
content: There is an LED flashing after boot. Is this normal ?

author: maurit
author_rank: Contributor
timestamp: April 13, 2024, 03:15:21 pm
content: Hi Korlatos,unfortunately, the procedure you indicated for restoring Boot doesn't work.
IFR COM 120B Functions missing, who can forward the macro file? - Page 1
Forum section: electronics / repair

author: sebwia
author_rank: Newbie
timestamp: February 03, 2024, 02:46:23 pm
content: Hello,I have an IFR 120B Com 120B. I downloaded teh evaluation guide and wnated to strat to get familiar with the item. In the guide is mentioned that below lists thre is an function list. Unfortunately the memory is empty. And also the menu item 12 setup to defaults is not available. Can someone send me the setups app macros file that i can reinstall over the pcmcia card? Or any other trick to recover?Thank you to all Sebastian
IFR1200s and super s Files Needed - Page 1
Forum section: electronics / repair

author: try2fix
author_rank: Contributor
timestamp: June 27, 2019, 12:18:00 am
content: My eproms have gotten corrupted on my IFR1200s. Looking for v6.1 , 7.1.and 1.12. Any help on locating would be great. I have called in and they are not sold any more, I was informed long time discontinued.

author: Simon
author_rank: Unknown
timestamp: June 27, 2019, 04:35:56 pm
content: Please do not post duplicate topics it just annoys everyone.
IGBT module of Sinvert siemens inverter - Page 1
Forum section: electronics / repair

author: Dark_Evil_69
author_rank: Newbie
timestamp: September 02, 2024, 01:20:42 pm
content: Hello, my name is Diego, I am writing in this forum because I am having problems finding the data sheet for a Siemens SINVERT inverter (which later became a refusol inverter), the issue is that my part number appears as REFU 0030457 DP 50Y1200 101953, however, I have not been able to find the data sheet, I don't know if anyone has it or could give me directions on how to find it, thank you very much.
IGBT module replacement questions - Page 1
Forum section: electronics / repair

author: Cgmaster1
author_rank: Newbie
timestamp: June 07, 2019, 03:45:12 am
content: First let me say I am not an electronics technician by any means. I do have the equipment to test and make repairs and know just enough to be dangerous.Posted in another section as well.I have a YAsakawa VFD that has a bad IGBT module.The old IGBT is 2MBI200N-060-10. I Know what everything means except for the -10 at the end.After reading It looks like this is an old model and there are several newer modules. I have found Fuji 2mbi200u2a-060-50 new for about the same price. Supposedly the ones I have in my VFD are like 2nd generation and the fuji 2mbi200u2a is a 5th generation. Can I use this as a replacement? IF I do do I need to replace all 6 modules? I am fairly new to working on electronics but am a fast learner. I have been reading through Fuji's information but could not find a definite answer. In addition the -50 at the end I could not find what it means.I plan to replace all 6 but want to know if I keep the old ones for backups if one goes bad in the future.

author: duak
author_rank: Super Contributor
timestamp: June 07, 2019, 05:36:53 am
content: One would have to go over the data sheets and compare the specs for any differences. I would bet the new parts are faster and perhaps more efficient and may require some adjustment in gate drive characteristics. The -10 vs -50 might mean packaging or pinout variations.I recently repaired a Yaskawa spindle drive with a dead output six pack. The first replacement lasted a month. It took a while to find, but one of the Mitsubishi hybrid drivers on the PCB was out of spec and was giving an anomalous drive signal to the output devices. I don't have any schematics or repair info from Yaskawa but I managed to simulate the drive signals to the output stage and then used an oscilloscope to find the blinky driver. I then tested the drive at low voltage before putting it back in the machine and firing it up for real. Does your VFD's PCB have 6 or 12 black rectangular parts about an inch square?I would save all the parts. Do you know how to check for a shorted IGBT with an ohmmeter? Also, you mentioned six modules but they are different - have some been replaced already or are they as they left the factory? Many Yaskawa VFDs are regenerative and have one set of modules for the converter and another for the inverter and perhaps they used different types.I got the replacement parts from some place in New York state thru ebay. They seem to have a bunch of parts for repairing Yaskawa drives.
IGBT SGL160N60UFD replacement - Page 1
Forum section: electronics / repair

author: Piet Hein
author_rank: Newbie
timestamp: October 15, 2021, 07:22:17 pm
content: I've got a SMPS with the two IGBT's shorted. A loose transistor mounting clip caused a short in the device which blew the IGBT's. They are the OnSemi SGL160N60UFD, the problem i have is that this part is obsolete. I'm having a hard time finding a equivalent part, what could be a drop in replacement for this part?

author: fzabkar
author_rank: Super Contributor
timestamp: October 16, 2021, 11:32:35 pm
content: Digikey suggests 4 substitutes:https://www.digikey.com/en/products/detail/on-semiconductor/SGL160N60UFDTU/1058056#product-details-substitutesFarnell carries stock of this IGBT globally:https://au.element14.com/on-semiconductor/sgl160n60ufdtu/igbt-ultrafast-600v-160a-to-264/dp/2101399?ost=sgl160n60ufdAlso ...https://www.futureelectronics.com/p/semiconductors--discretes--transistors--igbts/sgl160n60ufdtu-onsemi-7833700https://octopart.com/sgl160n60ufdtu-onsemi-84331405
Ignitor AS-16040 / AS-40045 IREM for Xenon short-arc lamp UXW-15KD USHIO - Page 1
Forum section: electronics / repair

author: BUAROD
author_rank: Contributor
timestamp: February 06, 2022, 09:52:46 am
content: A decommissioned xenon lamp has been lying in my basement for a number of years, waiting to be put into operation again.It is a 15kW Ushio UXW-15KD short arc lamp (picture 1) of the type formerly used in IMAX cinemas. With a burning voltageof 37.5 volts, a nominal current of 400 amps and approx. 45 kV ignition voltage. In continuous operation it requires watercooling!In order to generate the ignition voltage, a special ignition device is required that is connected in series between the powersupply and the lamp (picture 2). It generates the high voltage before the lamp is ignited and must be designed for an operatingcurrent of 400 amps (!) if operation at max. power is intended.For example, the AS-40045 ignition device from IREM (Italy) is suitable. Despite an intensive search in recent months, I havenot found such a device in used condition on the known platforms. In contrast, the AS16040 ( (picture 3,4) is offered quitefrequently.But this unit can only carry 160A continuous current and the ignition voltage is 40kV (picture 5). This voltage will not besufficient for this type of xenon lamp, specially at the end of its service life. So I was not very surprised that he unit wasnot able to ignite my old lamp.After analyzing the circuit and searching the network, the functional principle became clear to me (picture 1): a mainstransformer TA converts the 230 volts into approx. 15kV. This voltage reaches the primary side of the high-voltage transformervia a 4-stage spark gap. When the half-wave of the 15kV reaches the breakdown voltage, an oscillating circuit is created(3xC + HT) with extremely high current peaks, which generates high voltage pulses on the secondary side of transformer HT.Despite special materials on the spark gap surfaces, burn-off and contamination had occurred over the (apparently) longservice life. After dismantling and cleaning the spark gaps (picture 6,7), the idea was to consciously set the gaps a littlelarger than found. The intention was to increase the breakdown voltage and thus also to increase the voltage and energyin the resonant circuit.This not only successfully ignited the lamp (still without connection of a DC power supply), but also destroyed severalLED indication lamps in my control panel! I had connected the lamp with approx. 1m long cables and they obviously workedvery well as antennas! The LED-lamps without any EMC capacitors in the small E10-socket could not withstand theradiated energy. I then realized that I must have continued Marconi's experiments...
iiyama PL2888UH no backlight (blown fuse) - Page 1
Forum section: electronics / repair

author: loordgek
author_rank: Contributor
timestamp: May 08, 2019, 02:07:14 pm
content: i have a monitor that has no backlight (blown fuse)the problem is that i cant find a schematic for the powerboardthe backlight takes 24v @ 1.2 amps from the powerboard when i bypass the fuse.between 24v rail and ground is 10Mohmthe main questing is: what for rating needs the fuse to be
I'm having a ground loop issue with my interface (I think). - Page 1
Forum section: electronics / repair

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: January 12, 2020, 04:17:52 am
content: so I have a ESI ESP 1010 interface connected to my pc, and when I use AmpliTube I have this static noise, sounds like a ground loop issue. but I don't get where it's comming from, I have the interface just connected to my pc, I'm using headphones, my guitar is not grounded in any way except to the interface trough the cable, my pc is grounded (I think it is, maybe the chord is damaged idk. imma go check that)and the only thing that connects to my pc and has a connection to ground is my monitor but I checked and unpluging it doesn't change the noise.I am thinking of connecting my pc's ground to earth but this seems a really supid idea cause it will not be insulated from the mains then...but I don't even think it will help.note: I don't have a DI box between the guitar and interface but I shorted the input and it's still having static noise so it's not the problem.
I’m inquiring about an SMD component used in a Philips coffee machine. - Page 1
Forum section: electronics / repair

author: Rocky
author_rank: Newbie
timestamp: October 12, 2025, 01:15:15 pm
content: I’m trying to replace a burnt component labeled “U2” on the touch-panel PCB of a Philips EP series coffee machine.From searching online, I found a chip marking that looks similar, but I still can’t locate the exact same part anywhere.Out of the 6 pins, pin 2 appears to be connected to GND, and pin 5 seems to be tied to 5V.If anyone can suggest what the component might be, I’d really appreciate it.

author: temperance
author_rank: Super Contributor
timestamp: October 12, 2025, 02:12:23 pm
content: QuoteThen it is probably an op amp or comparator. Just trace the circuit and find a suitable replacement.

author: voltsandjolts
author_rank: Unknown
timestamp: October 12, 2025, 02:22:40 pm
content: I think I see marking MX.Chipsourcetekhave some stuff starting with MX.But could be many other things too.

author: gamalot
author_rank: Super Contributor
timestamp: October 15, 2025, 06:37:11 pm
content: NL27WZ17DFT2Ghttps://www.onsemi.com/download/data-sheet/pdf/nl27wz17-d.pdfhttps://www.lcsc.com/product-detail/C152467.html
iMac G3 slot loader speaker replacement  - Page 1
Forum section: electronics / repair

author: agent_power
author_rank: Regular Contributor
timestamp: March 30, 2023, 07:46:31 am
content: Hey allI've got an old iMac G3 (the transparent blue all in one) and it couldn't handle my 90s techno music at full volume... the rotting foam around the speakers fell apart.Has anyone replaced the speakers or the foam around it? What's the recommendation?From a quick search it looks like 28mm / 1 inch drivers at 3W? There's so many variants I would like to find one that I can fit with the least amount of hacking (or just the foam rings if that's easier)Thanks!

author: agent_power
author_rank: Regular Contributor
timestamp: April 30, 2023, 08:40:10 pm
content: I followed this guidehttps://medium.com/@bram.beirens/replace-imac-g3-speakers-suffering-from-foam-rot-71a7bd42dbdfand managed to replace the speakers. I used speaker glue and packing peanuts to secure the new (thinner) speakers in place.The new speakers don't sound as good as the old ones, but still decent for 10 bucks shipping included Aliexpress speakers and better than broken ones anyway.
Imax B6 AC V2 (or mini) wrong voltage reading in main battery port - Page 1
Forum section: electronics / repair

author: nnannos
author_rank: Contributor
timestamp: July 29, 2020, 05:27:45 pm
content: After replacing mcu(Megawin) on imax B6 the main battery port measures a 8.32volt battery as 17.30volt, but if balance is connected each cell is measured correctly. Something must have burn in the circuit but cannot find. Can anyone help me, i attach the Imax B6 mini(same for ACV2) schematic to see. If any one sees what component would be faulty please help.

author: dvd4me
author_rank: Regular Contributor
timestamp: December 29, 2022, 05:52:06 am
content: Hello,It's because is missing the calibration data. I cannot enter or boot the original FW also.
IMax B6 Burned parts - Page 1
Forum section: electronics / repair

author: kadolism
author_rank: Newbie
timestamp: January 19, 2022, 02:57:31 pm
content: I know this is a old charger but it serves its purpose for me.I mainly use it for discharging or charging my drone batteries to "Storage mode".Here are the images. I got the value of the resistors but not the transistors.Anyone can help please.

author: benj38
author_rank: Frequent Contributor
timestamp: January 19, 2022, 10:11:55 pm
content: If i am not mistaken, judging by the leftover visible markings on the burnt units, your image shows two other visually intact units that are with high probability the same.The burnt left unit looks identical to the top intact unit in the picture, and the burnt right unit looks identical to the intact unit at the bottom.Take a DMM to the intact units and try to figure out what they are (probably BJT transistors, but this is not guaranteed). With this information you can probably do a search on the Internet that would allow you to pinpoint the exact items by their markings.