hybridfree/eevblog-posts huggingface dataset:
Please help ID this Rubicon and NTC - Page 1
Forum section: electronics / repair

author: cybermaus
author_rank: Frequent Contributor
timestamp: June 02, 2022, 06:35:22 pm
content: This VFD was hooked to 3-phase 400V instead of its intended 230V and blew some stuffNow, I am quite aware it may have blown more then just the visible damage, and that it is likely never going to live again.But I am intrigued by the fact these obvious electrolytic buffer capacitors have no proper markings on them.No voltage, not capacity, no temperature.They show as Rubicons, and the brand and quality and source of the VFD is such that I have no reason to doubt it.Searching the net only shows Rubicons with normal specs.Is this sort of labelling by Rubicon normal?Does it mean these are build to spec for this VFD maker specifically?So the numbers are CB1286 H01 and D29344 and 151882 (the latter is probably some production run or datestamp)See imagesAlso, while I am posting: This obvious inrush limiting NTC is labeled TH3.Anyone has any idea on those specs?Thanksedit reorder attachment

author: free_electron
author_rank: Super Contributor
timestamp: June 02, 2022, 06:53:29 pm
content: those are custom designs for that particular device manufacturer.
Please, help identify a connector (Laptop Battery) - Page 1
Forum section: electronics / repair

author: pplaninsky
author_rank: Regular Contributor
timestamp: June 03, 2020, 05:24:07 pm
content: Hi,I am trying to repair an old laptop. Partly as an exercise, partly for sentimental reasons.In the picture, you can see a bladde connector for the battery.I found many similar connectors from TE Connectivity - but non of them is exactly the same.This connector is vintage year 2009.Check the logo printed on it. Do you know which company is that?Thank you in advance!

author: wraper
author_rank: Unknown
timestamp: June 03, 2020, 05:32:24 pm
content: Laptop batteries usually have custom connector.

author: Krotow
author_rank: Regular Contributor
timestamp: June 03, 2020, 08:28:51 pm
content: Search for battery for your old laptop model in eBay. Then you will be able at least purchase a new battery or get connector itself from some junk yard. Connectors itself are very often proprietary ones made for particular laptop model line.If you don't need a battery, use AC PSU from that laptop. Also laptop power connectors are particularly easy to find.

author: pplaninsky
author_rank: Regular Contributor
timestamp: June 04, 2020, 07:01:30 am
content: Hello,thanks for the ideas - I would look for a junk laptop on eBay, hopefully will find something.However, still out of curiosity, the logo on the connector should be some pretty famous company.I remember I have seen that elewhere, just can't remember which is that compnay.Thanks!
Please help identify electrical connector (power plug for electrical instrument) - Page 1
Forum section: electronics / repair

author: stetato
author_rank: Newbie
timestamp: March 28, 2024, 06:47:54 pm
content: Howdy Ya'll,I'm searching for manufacturer + part number details for a power plug for my electrical instrument.I have sifted through a large part of Digikey's inventory, but I cannot find the connector listed. Would be super happy if anyone recognises it.Please see attached drawing and photos.Connector pitch: ~6mmBest regards,

author: factory
author_rank: Super Contributor
timestamp: March 28, 2024, 07:28:24 pm
content: The USB cable in your picture kind of looks like those used by some shavers, question is how many variants are there and are they made in the correct polarity & size for your CA6133 Installation tester? That I don't know.Or just buy the proper cable from Chauvin-Arnoux "CHARGEUR USB-TYPE R P01102186" ;https://catalog.chauvin-arnoux.co.uk/uk_en/c-a-6133.html#RS sell it;https://fr.rs-online.com/web/p/accessoires-pour-testeurs-multifonctions/2296160David

author: stetato
author_rank: Newbie
timestamp: March 28, 2024, 08:27:02 pm
content: Hi and thanks for the reply,Sorry I should have stated that I am aware of that I can purchase the original cable, but thank you for helping.I was mostly curious since it seems to be a great power connector and would come in handy for other projects.Thank you for the comment regarding shaver power connectors. It seems to be as correct
Please help identify rotary switch - Page 1
Forum section: electronics / repair

author: pizm83
author_rank: Newbie
timestamp: November 12, 2020, 09:59:33 am
content: I have a sony DSC-HX50 camera.The rotary switch on the back of the camera is failing. The up-down-left-right and center buttons work fine, but the rotary part does mostly random stuff when I rotate the switch. This is irritating and does interfere with normal camera usage.This switch does not have any part number on it, just "3871" written on the side.From the service manual from sony this switch seems to have a part number 1-789-417-11The service manual is to large to upload here (exceeds the 4MB limit per file). But can be downloaded from elektroTanya:https://elektrotanya.com/sony_dsc-hx50_sm.rar/download.htmlThe part of interest is the S807 from the L3 pdf file from the archive.So far I have found the whole board as a replacement part, but that is rather pricey if from some reputable source OR is from aliexpress, I have ordered already two from aliexpress, one was not send at all, the second one got cancelled few days after the alleged shipment.If someone has access to some other documentation from sony and is able to provide a part number that can be used to buy this switch somewhere it would be great.

author: bob91343
author_rank: Super Contributor
timestamp: November 12, 2020, 10:14:08 pm
content: Did you contact Sony?

author: pizm83
author_rank: Newbie
timestamp: November 13, 2020, 06:12:58 pm
content: Quote from: bob91343 on November 12, 2020, 10:14:08 pmNo, I figured this is to low-level hardware stuff and they would not share such information. Do You think they would tell me where to but this rotary encoder?

author: bob91343
author_rank: Super Contributor
timestamp: November 13, 2020, 07:14:00 pm
content: Never rule out the possibility that the manufacturer might be able to supply the part or at least give you some advice.

author: pizm83
author_rank: Newbie
timestamp: November 14, 2020, 10:04:47 am
content: Quote from: bob91343 on November 13, 2020, 07:14:00 pmTrue that. I will contact them
Please help identify smd parts Rohde Schwarz SMIQ02B IQ modulator - Page 1
Forum section: electronics / repair

author: phlegeton
author_rank: Contributor
timestamp: April 16, 2021, 03:56:33 pm
content: Hello,I try to repair a IQ modulator from a R&S SMIQ02. At a first look at the components, I can't identify some smd parts. Hope their is someone we came across these parts, and can help me out. I can read the markings on the parts: The first part seems to have the marking "RP11G N580-4" the second part is under a metal part, but reads "N4".If a search on this "N4" part I only can find the 'NBB-400' and this is a MMIC amplifier DC to 8Ghz. Which I'm not sure if this is right. I can't find anything on the "RP11G N580-4" part.

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: April 16, 2021, 07:05:23 pm
content: That's an FP1189 Power FET.EDIT:https://www.qorvo.com/products/p/FP1189-G#overview

author: Storm
author_rank: Contributor
timestamp: April 16, 2021, 08:42:07 pm
content: N4 refers to Sirenza/Stanford Microdevices NGA-486.

author: phlegeton
author_rank: Contributor
timestamp: April 16, 2021, 11:13:39 pm
content: Thank you all! With this I can investigate further. I searched high and low. What is the trick to identify these smd parts ?

author: fzabkar
author_rank: Super Contributor
timestamp: April 17, 2021, 01:00:26 am
content: http://www.smdmark.com/en-US/search/code?id=fp11ghttps://www.google.com/search?q=filetype:pdf+fp11g

author: phlegeton
author_rank: Contributor
timestamp: April 17, 2021, 03:34:26 pm
content: ah I see where I got it wrong: I read the first character as "R" not as a "F". Again thanks. Now I now the part numbers it's so much easier to find the right datasheets.

author: zmetzing
author_rank: Contributor
timestamp: June 08, 2021, 02:36:14 am
content: Make sure you trace the signal path through those RF switches (white squares marked "4227T") before replacing the active devices. I replaced the amplifiers only to find out that the real problem was a bad switch.https://www.eevblog.com/forum/repair/rohde-schwarz-smiq03b-with-error-110-output-unleveled-iqmod-alc-failure/msg3189932/#msg3189932
Please help identify this ic - Page 1
Forum section: electronics / repair

author: C9u11
author_rank: Newbie
timestamp: June 17, 2022, 09:14:53 pm
content: Hi everyone,I have a water-damaged fuel gauge here that has a dead buck converter. I can’t for the life of me identify this chip, though. Any help would be greatly appreciated!

author: C9u11
author_rank: Newbie
timestamp: June 17, 2022, 09:30:25 pm
content: Spoke too soon!https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/44000000MCKn/3e48v2lP4vpbRsfOboAxhxdut0jxr3IIftfBJdJulOE
Please help me find a connector - Page 1
Forum section: electronics / repair

author: hward
author_rank: Newbie
timestamp: June 15, 2025, 03:49:13 am
content: Hi! I have a borken flex cable socket on an NEC P525UL projector. I've been looking on aliexpress for 92pin FFC connectors, but haven't been able to find one that fits. Is there hope to find a suitable part somewhere or what should I search for?

author: Psi
author_rank: Super Contributor
timestamp: June 15, 2025, 04:27:00 am
content: Have you counted pins to make sure the connector is actually 92pin or are you going on the silkscreen numbering?Sometimes they leave end pins NC and the connector has more pins than what's written on the silk.Or they count double ground pins separately but the connector datasheet counts them as one ground connection etc..Or they don't count the power connections, or other weirdness. It's not all that common, but happens and can ruin your day trying to find replacements.

author: hward
author_rank: Newbie
timestamp: June 15, 2025, 04:38:38 am
content: I counted them, and it's 46 per side for a total of 92. If anyone feels like recounting, both sides are visible in the picture with the measuring tape

author: Psi
author_rank: Super Contributor
timestamp: June 15, 2025, 06:15:13 am
content: This might be useful. It's DS for LCX202 which i think is what you have. Or close to it (92pos and looks the same). Has FFC diagram and sizes.https://www.sony-semicon.com/files/62/pdf/p-26_Product_Summary_LCX202_EN.pdfCould try email Sony and ask what connector part number is suitable for LCX202. Might work.
Please help me find polarizer filter for old display (HP 320LX) - Page 1
Forum section: electronics / repair

author: wmundstock
author_rank: Contributor
timestamp: January 25, 2023, 06:35:34 pm
content: Hi!I am trying to repair the screen of this old HP 320LX. The problem is that the screen is very dim, barely readable. I took it apart and realized someone else messed it up before me. It had a "removable" polarizer film over the main screen. I can tell it was not factory made because it was really poorly cut - apparently the technician did not know how to cut square angles.So I don't know much about LCD displays, but this one, even though it does have a light, is not backlit. The light source come from the side and does not affect the display too much.I purchased 2 different "types" of polarizer filters. One with adhesive and one without, tired both and failed. They all yield the same dim-almost-unreadable screen.I think it has to do with the type of polarizer filter. It feels like the one I have (and the one was there) is too dark like a sunglass. That blocks the light and it gets greenish tone and dark.I searched all the internet and did not find a different type of polarizer. I see those designed to repair motorcycle panel displays which are composed by 2 films, one reflective to go in the back of the display and one that goes in front of it. Even for those I have seen only examples of applications for backlit displays, so I guess that won't work either.Any of the experienced fellows could have some piece of advice for me? It breaks my heart to see this device like this. It is in near perfect condition, except for that "little" problem.Here is a picture to illustrate

author: DavidKo
author_rank: Frequent Contributor
timestamp: January 26, 2023, 06:18:38 am
content: You can try to remove one from some old LCD screen (there are 2). I have found out, that HP Compaq LA2405wg (probably the whole range) have the filters which are not glued and are easy to remove. In case that the filter is glued than you can help with heat during removal.
Please Help me Identify Another Component SOT-23 - Page 1
Forum section: electronics / repair

author: CrazyTiger
author_rank: Regular Contributor
timestamp: August 28, 2019, 12:09:24 am
content: Hi,I am having this SMD component that is measuring low (6 Ohms) at one of the junction.The Marking is SFs 0D. Attached is the picture for the part.PS: The picture was taken with me holding the board below my Microscope lens on one hand and my other hand was holding my camera steadily. Finally the picture was snapped by poking my tongue on the phone screen.My Guess is : This might be BSS169 which has a marking of SFs, but I am not sure about 0D, maybe production code?

author: fzabkar
author_rank: Super Contributor
timestamp: August 28, 2019, 12:31:07 am
content: Two possibilities?http://www.smdmark.com/en-US/search/code?id=SFshttps://www.infineon.com/dgdl/Infineon-BSS169-DS-v01_08-en.pdf?fileId=db3a304330f68606013108f39406004chttps://datasheet4u.com/datasheet-pdf-file/493594/SiemensGroup/BB804/1

author: narkeleptk
author_rank: Contributor
timestamp: August 28, 2019, 04:24:29 pm
content: Almost always the sideways code like that 0D will be date/batch code and not important when trying to replace.

author: CrazyTiger
author_rank: Regular Contributor
timestamp: August 30, 2019, 11:21:07 am
content: I went with BSS169, now waiting for the component to arrive.Thanks for the help
Please help me locate the fuses for an X570 Aorus Master computer motherboard? - Page 1
Forum section: electronics / repair

author: lightnb
author_rank: Newbie
timestamp: August 15, 2021, 04:19:09 pm
content: I have an X570 AORUS MASTER motherboard that worked for a while, but then one day when I shut down the computer, all the motherboard lights went out and it now has no standby power. I have already determined that it is the motherboard (not the PSU, etc) that is bad.I think it might just be a blown fuse on the motherboard.Could somebody help me locate where the fuses are on this board? In the attached image, are these the fuses circled in red, labeledPCK andPC2?If so, how do I determine their value?

author: wraper
author_rank: Unknown
timestamp: August 15, 2021, 04:32:43 pm
content: QuoteWell, dream about it. Fuses rarely fail just by themselves in low voltage electronic devices. And why didn't you just measure their resistance? Not to say those on the photo are resettable fuses. So they don't blow.QuoteWhy and how? What do you mean by standby power?

author: wraper
author_rank: Unknown
timestamp: August 15, 2021, 04:39:19 pm
content: BTW this motherboard should have 3 year warranty and since this model was released in July 2019 it should be well within it.

author: TheMG
author_rank: Frequent Contributor
timestamp: August 15, 2021, 05:10:31 pm
content: Those are self-resetting (polyfuse) fuses, and I doubt even if they were defective that they have anything to do with the motherboard not working. Such fuses are normally used on motherboards to protect from overload or short circuit on peripheral and accessory connectors, such as USB ports, fan headers, LED connectors, etc.

author: Simon
author_rank: Unknown
timestamp: August 15, 2021, 06:53:25 pm
content: Oh Aorus, I won't be buying one of those again, utter junk and presumably the rest of Gigabyte with them. My last gigabyte motherboard failed after 2 years but only by failing to boot drives not a total shutdown.Why do you not think the PSU has failed?

author: Mr Evil
author_rank: Regular Contributor
timestamp: August 16, 2021, 10:02:19 pm
content: There is a known problem with that board where it won't boot, which can be fixed by removing the battery. Seehttps://hardforum.com/threads/gigabyte-x570-aorus-master-wont-power-on-temporary-solution.1993194/That might not be the problem here, but it's an easy thing to try.

author: Ranayna
author_rank: Super Contributor
timestamp: August 17, 2021, 11:41:53 am
content: The position of those two fuses makes me assume that they are related to the RGB pinheaders directly next to them. That would make sense, because who knows what can get connected to those.I have had some issues with an apparently dead AsRock Mainboard in the past. Removal of the BIOS Battery, setting the clear jumper, and waiting for at least half an hour revived the board again. I suspect some part of the initial power up circuitry went bonkers.
please help me repair andonstar adsm302 - Page 1
Forum section: electronics / repair

author: RAPER
author_rank: Contributor
timestamp: March 10, 2022, 02:58:07 am
content: I have a problem with the andonstar adsm302 microscope. I haven't turned it on for half a year, and it turns out that after turning it on, it stops at the welcome screen. I copied the contents of the winbond 25q32 but nowhere is able to get another one. Is anyone able to copy from his ?? you don't even need to desolder it, all you need is a clip and ch341a. Please help, because I feel sorry for the equipment. Unless there is any possibility to use it with a hdmi monitor ?? greetings

author: RAPER
author_rank: Contributor
timestamp: March 10, 2022, 05:02:33 pm
content: Thank you very much, I will check in the evening

author: RAPER
author_rank: Contributor
timestamp: March 16, 2022, 12:22:24 am
content: Hello again, PeDre, I am sending you photos from the logs in PuTTy, from what I can see, the main processor probably has a problem. I used CH341A for the logs. I have no idea how to deal with it. It can use only the telescope and the matrix from the camera, or some webcams.

author: RAPER
author_rank: Contributor
timestamp: March 16, 2022, 06:56:11 pm
content: Wow you were right: o in the com port system settings, I had 9600 and no xor etc.

author: RAPER
author_rank: Contributor
timestamp: March 16, 2022, 08:23:20 pm
content: You can turn on your microscope without the tape from the telescope matrix attached?

author: RAPER
author_rank: Contributor
timestamp: March 16, 2022, 08:40:01 pm
content: Are you able to try ?? I could then rule out, soft etc.

author: RAPER
author_rank: Contributor
timestamp: March 16, 2022, 09:04:48 pm
content: Thank you very much, I am sure that I had to break the cmos cable somewhere. I will have great fun locating: D

author: SSaimor
author_rank: Newbie
timestamp: March 14, 2023, 07:26:52 pm
content: Hello. You did it? I am also in need.Quote from: RAPER on March 10, 2022, 02:58:07 am
Please help repair Fluke Ti27 thermal camera - Page 1
Forum section: electronics / repair

author: f14
author_rank: Regular Contributor
timestamp: April 23, 2023, 11:42:37 am
content: Hi all,I have problem with my Fluke Ti27 . it stuck in 60-100oC level ( manual/ auto mode are same)and poor accurateexample 300oC soldering iron it show ~90oC ( it raise up to 90oC and stuck in this temp even soldering iron is hotter)anything below 100oC can not get a imageSo have any Idea?. inside the camera is clean, no burn/blowup something. the FPGA Cylone IV is hottest component~60oC. DRS U3510 sensor is ~45oC (after power on 15min )thank you!
please help. Speaker amp is detected in my PC but somehow there's no power - Page 1
Forum section: electronics / repair

author: nightx8x
author_rank: Newbie
timestamp: February 06, 2021, 04:58:43 pm
content: Hello everybodyCan somebody please help? I have an SMSL Q5 pro and it suddenly stopped working. The thing is that windows 10 still see it. I mean there's a usb signal between the device and my PC. I can see it being detected when I change the sound devices but there is no sound and no light coming from the SMSL q5. I think it might be the external power brick but I'm not sure.I have no idea how to check and I have 0 experience with electronics. Is it safe if I try another external power power brick with the same specs?Thank you all.

author: techneut
author_rank: Regular Contributor
timestamp: February 06, 2021, 11:56:32 pm
content: If you have a powersupply 19V DC with the + on the inside can you try it.
Please help: Strange signal signal from my wiltron 6672a sweeper - Page 1
Forum section: electronics / repair

author: pe2ben
author_rank: Contributor
timestamp: November 21, 2023, 02:05:20 pm
content: Hello everyone, i have a strange signal on the output. The picture gives the signal after the YIG, Isolator, PIN switch and amplifier but before the multiplier.What kind of disturbing do i see here.Sorry but i a newbie in this measuringThanks Ben

author: pe2ben
author_rank: Contributor
timestamp: November 21, 2023, 02:15:35 pm
content: problems to add pictures
Please help to determine what model diode this is - Page 1
Forum section: electronics / repair

author: daisizhou
author_rank: Super Contributor
timestamp: October 22, 2022, 01:36:31 pm
content: I found this diode shorted while I was repairing the power supply.but I can't identify this exact model.looks like a fast recovery diode.If anyone knows this model please let me know, thanks(BT 5INB1)

author: tooki
author_rank: Super Contributor
timestamp: October 22, 2022, 01:57:13 pm
content: Littelfuse 18V TVS diode.The “BT” is the important part. (And the LF logo.) The rest is just the date and lot code. (5 = 2015, 2005, 1995, etc; I = September)As for which exact model it is, that depends on the physical dimensions of the package. Here are some candidates:https://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_datasheet.pdf.pdfhttps://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_hr_datasheet.pdf.pdfhttps://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smaj_datasheet.pdf.pdfhttps://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_sma6l_datasheet.pdf.pdfhttps://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smf_datasheet.pdf.pdfBecause of the squareness of it and the lack of cathode band, I suspect it’s the SMBJ.Since this is a circuit protection device, if you remove the suspected shorted one, the device should work again without it. It just won’t be protected against voltage spikes.

author: daisizhou
author_rank: Super Contributor
timestamp: October 22, 2022, 02:25:48 pm
content: Thank you for your help
PLEASE HELP TO FIND THID SMD CODE SOT363 - Page 1
Forum section: electronics / repair

author: HUGOMAN
author_rank: Regular Contributor
timestamp: March 02, 2024, 05:55:10 pm
content: Hello to AllPlesase help to find what reference for this code of the following photo.Thanks and Regards

author: fzabkar
author_rank: Super Contributor
timestamp: March 02, 2024, 09:01:36 pm
content: IV7xx = |V7yw = MP2451DTMP2451DT, Monolithic Power, Step-Down Converter, 3.3V - 36Vin, 2MHz, 0.6A, marking V7yw, SOT23-6 / TSOT23-6:https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2451/document_id/253https://ae01.alicdn.com/kf/S1c4b06e22e3447ddbd26e720c3b43798y.jpg(photo)http://markingcodes.com/search/c/iv7

author: HUGOMAN
author_rank: Regular Contributor
timestamp: March 02, 2024, 10:33:16 pm
content: Thank You fzabkar.
Please help to fix my Agilent 34401A - Page 1
Forum section: electronics / repair

author: h4z4rd
author_rank: Newbie
timestamp: September 17, 2014, 12:59:20 pm
content: Hi guys!I've an Agilent 34401A DMM I bought it on Ebay.The seller didn't mention that it has a problem but he sold it AS-IS and it also was really cheap.About the problem:When I turn it on it shows an error message. The error #604 (A/D slope convergence failed).When it shows this error message I can't measure AC because it's all over the place.When it does not drop the error message it works good but most of the time it doesn't.I checked the solder joints and all looks good.I'd like to get some help to fix my DMM. What could be the problem? What should I check first?Thank you!

author: MarkPalmer
author_rank: Regular Contributor
timestamp: September 18, 2014, 06:29:13 pm
content: Here is its service manual.http://literature.cdn.keysight.com/litweb/pdf/34401-90013.pdfQuoted from manual: A/D slope convergence failed: The dc section is configured to the measure zero state (MZ) in the 10 V range. This test checks whether the ADC integrator produces nominally the same number of positive andnegative slope decisions (±10%) during a 20 ms interval.This problem most likely refers to the A/D converter IC itself, or possibly whatever is supplying power to it.-Mark-

author: Zapro
author_rank: Contributor
timestamp: October 27, 2014, 03:17:20 pm
content: My 34401a had this fault. After replacing almost all op-amps in the input, i found out that some zener regulators for U201 was faulty. And U102 too (and that cost me an arm and a leg) but replacing the chip and zeners fixed it.

author: vinovino
author_rank: Contributor
timestamp: June 25, 2024, 03:45:04 am
content: What chip did you replace?U201 or U102?
Please help to identify a connector (cable assembly) - Page 1
Forum section: electronics / repair

author: analogRF
author_rank: Super Contributor
timestamp: May 23, 2022, 03:48:38 pm
content: The shown cable assembly (2x20 pins) is used in Keysight Fieldfox to connect the front panel to the main board.It is way too short (1.5") such that even re-assembly by itself is a hard job let alone opening the two parts wide on the table.Does anybody know what type of connector this is?I would like to buy a longer cable assembly that fits so that it would let me to open the unit and still be able turn it on.yes, I know one dirty way is to cut all 40 wires and solder extension wires to them but I want to avoid that as much as possibleI tried my best on Digikey but could not find anything similar in size that fits into the male on board connectorsany help is highly appreciated

author: analogRF
author_rank: Super Contributor
timestamp: May 23, 2022, 03:53:20 pm
content: The "fancy" part in the middle of the female connector is misleading because the male connector is just made of simple pinsthat go into the holes. so just having a right size would be enough, does not need to match exactly the shape.But I cannot find anything...if anyone has any idea, I greatly appreciate sharing it

author: analogRF
author_rank: Super Contributor
timestamp: May 24, 2022, 05:11:57 pm
content: Answer is found herehttps://www.eevblog.com/forum/projects/please-help-to-identify-a-connector-(cable-assembly)-326218/new/?topicseen#new
Please help to identify component - Page 1
Forum section: electronics / repair

author: ValSergeev
author_rank: Newbie
timestamp: April 24, 2024, 09:09:26 am
content: Hello lads.After unsuccessful searches on the Internet, I came to you asking for help in identifying a component. It is located in the LCD panel control board circuit.I will be sincerely glad for your help!

author: m k
author_rank: Super Contributor
timestamp: May 01, 2024, 04:51:14 pm
content: So power out, supply, AC in and what ever in from the left.Above parts are uncertain and ground must go under it.Has K-component more than two contacts?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 01, 2024, 05:06:33 pm
content: Buck regulator - unfortunately there are about a gazillion options for what it could be - searching by package and pinout would be a start but likely still dozens to hundreds of possibilities

author: amyk
author_rank: Super Contributor
timestamp: May 02, 2024, 12:52:18 am
content: Micrel/Microchip MICxxxx series seems to have similar markings...

author: floobydust
author_rank: Super Contributor
timestamp: May 02, 2024, 01:28:11 am
content: Welcome to the forumsI find SMD marking "71A" QFN-8 package isRT8297buck converter.
Please help to identify this IC - Page 1
Forum section: electronics / repair

author: cozza
author_rank: Regular Contributor
timestamp: June 14, 2024, 12:36:46 am
content: Hello, I am repairing a RGB drive board from an LED lighting fixture, and would like some help identifying a chip.The device is marked AJF BAC and has 16 pins, it appears to be a buck converter. There are three identical channels driven by a MAX5715 4 channel DAC. The green channel is stuck on at medium intensity, and changes by one or two steps only.The back side of the board has three power mosfets, 3 high current diodes and three large inductors.I haven't had any success finding a part number for the device.Thank you for any assistance!

author: fzabkar
author_rank: Super Contributor
timestamp: June 14, 2024, 02:50:46 am
content: Maybe MAX4783ETE?https://www.analog.com/media/en/technical-documentation/data-sheets/max4781-max4783.pdf(datasheet)https://www.ebay.com/itm/392508211438(photo)

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 14, 2024, 02:51:37 am
content: That's a fancy LED driver.Three digitAxxis definitely Maxim topmark format, so I guess you can start there.There used to be topmark database on their old website before ADI merger, but it appears to be gone now. Unfortunately they also stop listing topmark on their datasheet a while ago.Quote from: fzabkar on June 14, 2024, 02:50:46 amNah, first line is the part number.

author: cozza
author_rank: Regular Contributor
timestamp: June 14, 2024, 03:10:16 am
content: Update : I've done some more diagnostic work and swapped two of the buck converters (blue and green)- no change so the part is not faulty.Look like a control issue which need further investigation.

author: fzabkar
author_rank: Super Contributor
timestamp: June 14, 2024, 02:39:03 pm
content: This database has several Maxim parts with an "AJF" marking, but all are in the wrong package.http://markingcodes.com/search/c/ajfMy previous guess was wrong:http://markingcodes.com/search/c/abn
Please Help to Indentify Value of Resistor in Siglent SDG805 Generator - Page 1
Forum section: electronics / repair

author: DC912
author_rank: Contributor
timestamp: January 05, 2023, 04:57:00 pm
content: In the course of attempting to recover my SDG805 from a failure to boot up, I destroyed resistor R42 without having first determined its value.I've searched through all of the tear down photos on the forum but could not locate one that shows the part.If someone who has a generator in the SDG800 family could provide the value of R42, I would really appreciate it.Photos that show where the resistor is located on the bottom of the unit after the outer case is removed are attached.Thank you.

author: pepe10000
author_rank: Regular Contributor
timestamp: January 06, 2023, 09:35:04 am
content: Hello.10K Ohm.All the best.

author: DC912
author_rank: Contributor
timestamp: January 06, 2023, 02:48:04 pm
content: Thank you.
Please help troubleshooting Advantest r6144 - Page 1
Forum section: electronics / repair

author: n_haku
author_rank: Contributor
timestamp: May 15, 2022, 03:43:50 pm
content: After start my experiment with jref, I searched on one auction for some useful equipment, and accidentally found this damaged Advantest R6144 voltage/current generatorand almost passed by, but one of seller photos showed it working without errors. After quick search any internal structure pics, it seems that with this damage at high probability I lose only GPIB interface. Well, it's not that big deal with its price (approx $60), so I bid.After receive, I removed crushed connector, hold switch and ready out BNC connector. Quick test shows any manual function work well, output pretty withing specs, but when I tried long cold-start run logging with diy DVM (inspired by nanodvm challenge), I gotAwww fiddletsicks! what the....Hmm, that oscillation aligned to normal voltage, and have approx 30s period, so it's probably some bad contact somewhere...When I searched internals pics, I run into this bloghttps://damien.douxchamps.net/elec/equipment/advantest_r6144/stability_fix/so relay can be an issue. Ok, quad already no longer available, so at least I can order TQ2 normal and latched to replace G6H-2. To be short, done up until now: removed and short K9 (polarity), K4 (volt<>millivolt) replaced temporarily (TM) with 2 relays and some wires, replaced K1, K2, K3 to new ones, short sense and force traces at connector, linearity pot replaced with 2 resistors, renew solder on critical path. Well, all useless, this behavior almost not changed.This is well temperature-dependent, when relatively cold in my room, I may obtain up to days w/o oscillation, and if temp rise or covered with some blanket, output start to oscillate. Also if temp is on edge, it can oscillate with much lower amplitude, say 25uV, not usual 250-300uV. Current mode also shows same.Any advice, what else can I try?(I found manualhere, but seems no interesting info about this problem).

author: n_haku
author_rank: Contributor
timestamp: May 15, 2022, 03:45:20 pm
content: On side note, while all that repair, I test a bit this generator as I intend to use - null voltage generator to observe uV change in jfet voltage with diy TEC chamber, and notice pretty high noise. Well, specs says 3mV in (20Hz-20MHz), pwm freq is 1kHz, but settling time to 0,1% only 50ms, so LPF tau should be pretty low, no wonder noise this high. A bit of dig in analog pcb results in this schematic of pwm-to-voltage block:it's less complicated than I initially thought, ok, lets ltspice it:Reference is 7V, so to obtain 16V, output scaled up, meaning noise also scaled up. Well, I don't need that ultramegafast settling time, noise much more importatnt, so I replaced caps to 680n, 470n, 220n in LPF and 120n+68n in active filter. Theoretically, this should push pwm nouse down to part of uV.
Please help: UHF8JT rectifying diode replacement - Page 1
Forum section: electronics / repair

author: Bicurico
author_rank: Super Contributor
timestamp: January 30, 2023, 03:07:15 pm
content: Hello,I am searching for a replacement of a VISHAY "High Voltage Ultrafast Rectifier" model UHF8JT. (https://www.mouser.com/datasheet/2/427/88956-339625.pdf)This one has been discontinued and VISHAY recommends as alternative model VS-ETH0806FP-M3. (https://www.mouser.com/PCN/Vishay_PCN_DD_006_2018.pdf)However, the alternate model does not come in ITO-220AC package. As far as I understand, this package has the backside isolated so that you can screw it against a cooler.Do you know of an available replacement in ITO-220AC? This is for the high voltage part of a Samsung TV power board (see my other thread).If I only get a replacement in TO-220AC package, what will happen if I screw it to the cooler? Does it make any difference? Isn't pin 1 GND?Is there a way to isolate it? Could I glue some electrical tape? Wouldn't that invalidate the cooling?Sorry for these lame questions, but I feel stuck on a simple component...Regards,Vitor

author: fzabkar
author_rank: Super Contributor
timestamp: January 30, 2023, 07:37:56 pm
content: Is there a connection between pin #1 and the heatsink via the PCB? If not, then you must isolate the diode. If you use the non-isolated package, then you will need something like this (silicone rubber pad and bush):
Please help, what model of pressure sensor is this? - Page 1
Forum section: electronics / repair

author: daisizhou
author_rank: Super Contributor
timestamp: July 14, 2024, 11:40:34 pm
content: The picture of the pressure sensor is shown below.It measures atmospheric pressure.Temperature also needs.The SG303 in the picture is an active crystal oscillator 32.768KHZ,The TO-92 packaged direct-insertion transistor looks like a voltage-stabilizing transistor.I can only see LE30...If you know the model of this pressure sensor and the model of the transistor, please tell me. Thank you for your help.

author: fzabkar
author_rank: Super Contributor
timestamp: July 14, 2024, 11:52:50 pm
content: LE30C, STMicroelectronics, very low drop voltage regulator with inhibit, 3.0V, 150mA, TO92:https://www.st.com/resource/en/datasheet/lexx.pdfhttps://www.ariat-tech.com/datasheet/77/LP38693MPX-ADJ.pdfSome clues for the sensor ...https://web.archive.org/web/20130831164822/http://www.meas-spec.com/downloads/MS5535C.pdfhttps://web.archive.org/web/20130831163916/http://www.meas-spec.com/downloads/MS5535-30C.pdfhttps://web.archive.org/web/20160324025957/http://meas-spec.com/pressure-sensors/board-level-pressure-sensors/digital-pressure-sensor-modules.aspxhttps://pl.aliexpress.com/item/32364933447.html(photo of MS5535)http://www.sensorportal.net/Product/2013/0426/53172.html(photo of MS5534C)https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FMS5534C%7FB2%7Fpdf%7FEnglish%7FENG_DS_MS5534C_B2.pdf%7F325534009-50(MS5534C datasheet)

author: Poroit
author_rank: Frequent Contributor
timestamp: July 15, 2024, 05:49:25 am
content: G'day Fzabkar,I see a number of your posts re identifying parts.Great work mate!!

author: fzabkar
author_rank: Super Contributor
timestamp: July 15, 2024, 06:00:14 am
content: Quote from: Poroit on July 15, 2024, 05:49:25 amThanks. You sound like a detective yourself. ;-)

author: Koray
author_rank: Regular Contributor
timestamp: July 17, 2024, 06:15:26 am
content: Fzabkar is a wizard! :-)
Please help with ROHDE SCHWARZ SMS power supply - Page 1
Forum section: electronics / repair

author: george79
author_rank: Contributor
timestamp: February 14, 2024, 02:36:10 pm
content: Hello,i made an attemp to recap the power supply of my SMS generator because of the age of the capacitors. I have replaced all the electrolytics and the tantalum ones with the correct voltage and capacity. After the replace i thought that it is wise to test the power supply before connect it to the instrument. And found something strange.All the voltages are correct and adjustabled by the trimmer that they have for every voltage except the first +5v. In this voltage i have the exact output +9.6v like the input (a little higher that the 8.2v) that tell on the MP1 test point. But in the MP2 test point i have the same +9.6v. And i cannot adjust it with the R2 trimmer. i have tried to swap the B1 and B2 fro the other voltages, and i have the same results. I have tested the 2N3055 and its good. I think that the trimmer is faulty or T4.Please can you tell me some quick test that i can do before i will start to desolder and test each component?I think to start meter at pin 5 of the B1, from the pin 6 i have and i tested 7.15v reference, so with the trimmer adjust i think that i will have adjustable voltage at 5.Please any help acceptableThank youGeorge

author: tom66
author_rank: Super Contributor
timestamp: February 14, 2024, 02:41:02 pm
content: Have you tried applying a load to the output? It is quite possible it will only regulate to 5V when loaded with something like a few hundred mA.You can see if the regulator controller is driving the transistor correctly. In regulation, I would expect the base of the transistor to sit somewhere around 600mV above the output voltage, and T4's base should be another 600mV above that.However, bets are off if there is no load, because leakage current can bias the output up from the base. It looks like the circuit only has ca. 16k ohm load from the feedback dividers, so more than ~300uA of base current could drive the output high. That seems quite plausible for an older linear regulator circuit.

author: george79
author_rank: Contributor
timestamp: February 14, 2024, 11:11:56 pm
content: Thanks for your help Tom66,yes under load the regulation is OK. I have tried first with a resistor, because its a bad thing to burn a lot of electronics in this generator. So everything fine, and i can continue replacing the tantalum capacitors now.Thanks again

author: xavier60
author_rank: Super Contributor
timestamp: February 15, 2024, 12:17:27 am
content: That usually happens when the design has a bypass resistor across the pass transistor.What's the voltage on pin 10 of IC B1?
Please help with zener-diode identification - Page 1
Forum section: electronics / repair

author: jhdoe
author_rank: Newbie
timestamp: August 20, 2021, 12:29:06 am
content: Hi folks,I have an issue with blown zener-diode, here is the photo (next to the red frame you can see intact diode):Label says it isUF00. I've tried to google for SOD-323F package diodes with UF00 text and found only BZX84J-C4V3 or CZRF7V5B-HF (http://www.s-manuals.com/smd/uf). However I'm not completely sure about exact one.Intact diode has 3.5V on it when device is powered on. I assume it is related to the USB input, because it is located right next to the USB Type-B port.Are there any possible replacement options?Many thanks

author: bob91343
author_rank: Super Contributor
timestamp: August 20, 2021, 04:36:26 am
content: It's UF0D. But casual observation shows that the two diodes are the same and in antiparallel. So measure the good one and replace the blown with a similar rating.

author: gamalot
author_rank: Super Contributor
timestamp: August 20, 2021, 02:39:40 pm
content: They are switching diodes not zener diodes.https://datasheet.lcsc.com/lcsc/1810010114_KEC-Semicon-KDS160-RTK-P_C69757.pdf

author: jhdoe
author_rank: Newbie
timestamp: August 21, 2021, 12:02:59 am
content: Thanks a lot! I was able to find retailer on ebay (https://www.ebay.com/itm/333603716254) and order new parts!
Please help identify this IC FLA-MZ (Synology DS411Slim) - Page 1
Forum section: electronics / repair

author: DC1MC
author_rank: Super Contributor
timestamp: April 25, 2021, 09:11:51 pm
content: Hello everybody,it's now time for me to ask for help, I've got a nice little Synology DS411Lite with the famous "blue blink of death", unfortunately not a firmware corruption problem, but one of the power supplies is showing short-circuitIt's a small ca. 2.5x2.5mm IC that is obviously a switcher, in the picture is U17, on the almost invisible markings it has F LA on the first row and MZ on the second row.A similar chip is used on the neighbor power supply, that produces 5V.Also if someone ever measured or could measure the voltage there on such a device, I'll be most grateful.Many thanks,DC1MC

author: fzabkar
author_rank: Super Contributor
timestamp: April 25, 2021, 09:49:42 pm
content: If you can't identify the chip, examine the 5V supply and identify the two resistors that form a voltage divider from Vout to the feedback and ground pins. Measure the voltage on the feedback pin (Vfb). Locate the same resistors in your dead circuit and compute the expected output based on Vfb and the values of the resistors.Vout = (1 + Rhigh / Rlow) x Vfb

author: amyk
author_rank: Super Contributor
timestamp: April 26, 2021, 02:43:50 am
content: Could you provide a better picture of it? Sometimes if it's laser-marked, rubbing it with liquid may reveal the markings more clearly.Is there a '-' or '=' between "F" and "LA"? I suspect this is a Richtek part of some sort.

author: DC1MC
author_rank: Super Contributor
timestamp: April 26, 2021, 05:31:04 am
content: Quote from: amyk on April 26, 2021, 02:43:50 amNo, there is nothing of this, no better pictures available, it was a stretch for my phone camera, I'm afraid that board is anyways knakered, but for reference the markins looked like:F LAMZthere is a space in between F and LA on the first row.Cheers,DC1MC
Please identify colour code for the colour blind guy - Page 1
Forum section: electronics / repair

author: Tim88
author_rank: Regular Contributor
timestamp: July 06, 2024, 02:51:40 am
content: Looks purple, grey, yellow to me?

author: David_AVD
author_rank: Super Contributor
timestamp: July 06, 2024, 02:54:57 am
content: Blue grey orange. 683 68K

author: IanB
author_rank: Super Contributor
timestamp: July 06, 2024, 02:57:33 am
content: Blue Grey Orange Gold

author: Chris56000
author_rank: Frequent Contributor
timestamp: July 08, 2024, 01:45:14 pm
content: Use a 68 kΩ 5% 2 W metal–oxide type resistor if you need to replace it, but that type of resistor is fairly reliable so you probably won't have to!Chris Williams

author: fzabkar
author_rank: Super Contributor
timestamp: July 08, 2024, 06:11:04 pm
content: I'm a red-green dichromat.I use WhatColor:http://www.hikarun.com/e/Unfortunately, the colours are often obscurely identified as speckled frangipani, or something that only a woman would understand.
please identify smd item - Page 1
Forum section: electronics / repair

author: momolou
author_rank: Newbie
timestamp: March 16, 2022, 09:25:29 am
content: can someone identify what tipe this thing ?from constant adc 600

author: tooki
author_rank: Super Contributor
timestamp: March 16, 2022, 12:24:40 pm
content: 471 is a 470 ohm resistor. But there’s another thing (probably another resistor) hanging onto the end of it…Edit: oops, I didn’t even realize that I’d completely missed the 0 key on my phone when replying!

author: inse
author_rank: Super Contributor
timestamp: March 16, 2022, 12:26:59 pm
content: 471=470 Ohms

author: Ian.M
author_rank: Super Contributor
timestamp: March 16, 2022, 01:57:46 pm
content: Quote from: inse on March 16, 2022, 12:26:59 pmYep. Its <digit><digit><power of ten multiplier> just like the resistor color code (>=10 ohms), before thru-hole resistors acquired more bands than you can shake a stick at!

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 16, 2022, 03:12:34 pm
content: what thought on the white square ?SMD's R is so easy rule: the last digit is the exponent power numberso471=47 . 101=470 ohm2402 = 240 . 102=24000 ohm=24K ohm

author: Hamelec
author_rank: Regular Contributor
timestamp: March 16, 2022, 03:23:33 pm
content: easier:the last digit is the number of Zeros you have to add.

author: Ian.M
author_rank: Super Contributor
timestamp: March 16, 2022, 03:33:14 pm
content: .... unless there's a letter 'R' in the code!

author: inse
author_rank: Super Contributor
timestamp: March 16, 2022, 07:05:41 pm
content: The white square, probably a resistor flipped over, some botch work.Unsolder it to find out.
Please tell me what this is - Page 1
Forum section: electronics / repair

author: Kalle
author_rank: Newbie
timestamp: July 04, 2021, 08:07:29 pm
content: I have this component which I need to replace for obvious reasons. I have googled it but can't find anything useful. So if anyone can point me to a data sheet or something, I would be grateful.It's used in a speed regulator for a small 24 VDC motor. The motor probably use less than one amp.My guess is that it is either a voltage regulator or a power transistor of some kind.

author: jpanhalt
author_rank: Super Contributor
timestamp: July 04, 2021, 08:22:03 pm
content: One-terminal devices are "uncommon." Can you show the backside?

author: Audiorepair
author_rank: Frequent Contributor
timestamp: July 04, 2021, 08:25:21 pm
content: https://www.onsemi.com/pdf/datasheet/mbr735-d.pdf

author: bob91343
author_rank: Super Contributor
timestamp: July 04, 2021, 09:10:47 pm
content: I would guess 2SB745.https://pdf1.alldatasheet.com/datasheet-pdf/view/12809/PANASONIC/2SB745.html

author: fzabkar
author_rank: Super Contributor
timestamp: July 04, 2021, 11:01:34 pm
content: http://www.smdmark.com/en-US/search/code?id=b745
pls help identify 2 components (laser driver board) - Page 1
Forum section: electronics / repair

author: Daxxin
author_rank: Regular Contributor
timestamp: October 22, 2022, 02:57:17 am
content: thanks in advance

author: fzabkar
author_rank: Super Contributor
timestamp: October 22, 2022, 03:10:17 am
content: AO4401, Alpha & Omega, P-Ch Enhancement Mode FET, -30V, -6.1A, 46 mOhm Rdson, SOIC-8:https://xdevs.com/doc/_Datasheets/ALPHA_OMEGA/ao4401.pdfFL7760, ON Semiconductor, High-Side Sensing Constant Current Buck Controller for High Switching Frequency LED Driver, marking 60xT, SOT23−6LD:https://www.onsemi.com/pdf/datasheet/fl7760-d.pdf