hybridfree/eevblog-posts huggingface dataset:
Full backup/restore of VOLTCRAFT DSO-1202D (HANTEK DSO5202B) - Page 1
Forum section: electronics / repair

author: rugo100
author_rank: Contributor
timestamp: December 05, 2024, 02:25:02 pm
content: Hi,I am looking for somebody who can supply or can give source of a full backup of a Voltcraft DSO-1202D (Hantek DSO-5202B)My DSO went wrong and maybe a full restore can help.thank you
Function Generators for Scope Cals - Page 1
Forum section: electronics / repair

author: Zenwizard
author_rank: Regular Contributor
timestamp: November 05, 2022, 09:49:58 pm
content: I have been getting the question on the Channel for quite some time about using a function generator to calibrate a scope. I do not recommend this as a rule but some times you have to work with what is available and a FG is all that is available. To that end I have acquired a Rigol 4216 and a Rigol 2102 to see if a cal can be done reasonably well. I have been working on a data set to see what I am getting in to and honestly I am a bit impressed with these units. The excel sheet has testing with native clocks, 10Mhz GPSDO, and Rubidium frequency standered.A video will be coming with all the data as well as some more testing still need to test the rise time. But for being an arb things are looking quite good.
Function of capacitor at DC motor terminals - Page 1
Forum section: electronics / repair

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 07, 2022, 03:48:47 pm
content: What actually is function of capacitor shorted across a DC motor terminal, how is its working mechanism on which condition it's really required ?

author: wasedadoc
author_rank: Super Contributor
timestamp: December 07, 2022, 04:12:19 pm
content: Interference suppression. DC motors with commutators produce sparks. Google Marconi and his early spark transmitters.

author: David Hess
author_rank: Super Contributor
timestamp: December 08, 2022, 02:03:24 am
content: I second wasedadoc's statement; the capacitor is for suppression of the noise from the commutator.

author: MikeK
author_rank: Super Contributor
timestamp: December 08, 2022, 02:09:19 am
content: https://www.pololu.com/docs/0J15/9

author: CatalinaWOW
author_rank: Super Contributor
timestamp: December 08, 2022, 02:41:28 am
content: The capacitor helps a lot. Remove it and put an AM radio near the motor. Since the worst noise is at harmonics of the commutation frequency you may have to tune the radio or adjust motor speed to hear it easily. Motor speed is best because then you are sure the motor is the culprit. Re-install the capacitor and repeat. My experience is many dB of improvement.
Function of these left-over mechanical parts? (HP 8590/91E) - Page 1
Forum section: electronics / repair

author: Greybeard
author_rank: Frequent Contributor
timestamp: May 21, 2024, 09:46:16 am
content: I found these parts in a separate plastic bag taped on the back of an HP8591E spectrum analyzer, they seem to be left over from the previous user's last repair attempt.Maybe one of you know the function or position of the parts in the device.For size reference: The screws have M4 threads (5/32")Material of the rectangular parts: looks like aluminium, but zinc or magnesium is also possible.

author: AndrewEp17
author_rank: Contributor
timestamp: May 22, 2024, 04:03:21 pm
content: It's possibly for mounting a heatsink to a component. Maybe the previous owner replaced a transistor or something with a different package and it didn't fit the heatsink. Or they just had parts left over and didn't want to take it apart again to put them back haha

author: Greybeard
author_rank: Frequent Contributor
timestamp: May 23, 2024, 10:47:26 am
content: Quote from: AndrewEp17 on May 22, 2024, 04:03:21 pmExactly, that's what the user said.Quote from: AndrewEp17 on May 22, 2024, 04:03:21 pmNo, he just opened the case (he said)...

author: m k
author_rank: Super Contributor
timestamp: June 05, 2024, 04:05:37 pm
content: Maybe structural something for plastic, where final pressure is between irons.And behind a corner since left out.

author: Greybeard
author_rank: Frequent Contributor
timestamp: October 07, 2024, 11:30:58 am
content: Finally I found out it's the rear foot spacers:
Funky Fluke 87-iii revision  - Page 1
Forum section: electronics / repair

author: ogdento
author_rank: Regular Contributor
timestamp: February 15, 2020, 03:11:38 am
content: Yesterday I ran across a post describing a burned 87-iii main/U4 IC, and what was strange is that the board had a different U4 IC number - and just looked different - than any 87-iii board I'd ever seen... but it is absolutely an 87-iii meter. (if you're interested, the post is:https://www.eevblog.com/forum/repair/fluke-87-iii-burned-processor/)Of the 10 or so 87-iii boards I've seen they've all had gold plating, almost exclusively used smd components... and had a U4 IC marking of SMX2-87, but this guy's 87-iii has an IC with 921606, which sounded familiar. I looked at a couple of my old 87-i parts boards and they've got 921606 chips on them!(I always thought the 87-iii had a new IC because of the new logic and other stuff that was added... so I wondered if the 921606 IC is the SAME as an SMX87-2. This would be great for anyone who's got an 87-iii with dead U4)Anyway, a broken 87-iii I just won on eBay arrived today, and when I cracked it open it had the same weird 87-iii board and U4 chip!!Here's the back... definitely an 87-iii:I realize this must be the first revision of the 87-iii, notice that it looks very similar to the CAT-3 rated 87-i (aka 87-ii)... uses the old regulator, selector switch, capacitors, green backlight, etc. But it's got all the new 87-iii 74HC logic chips on the back, and the extra stuff on the front.Does anybody know for sure if the 921606 chip is the same as the SMX2-87?

author: ogdento
author_rank: Regular Contributor
timestamp: February 15, 2020, 03:15:46 am
content: Here's the shot of a CAT-3 rated 87-i, aka 87-2 (left), the older 87-iii board I got today (center), and the 87-iii board I'm used to seeing (right):

author: mzacharias
author_rank: Frequent Contributor
timestamp: February 15, 2020, 02:55:44 pm
content: I don't see any date codes on that processor on the right side one, but I notice a newer style function switch (cheaper) which obviously would use the circuit board tracks similar to an 87-5.Very peculiar.

author: ogdento
author_rank: Regular Contributor
timestamp: February 15, 2020, 08:04:01 pm
content: Hey mzacharias,Yeah so for that 87-iii SMX2-87 chip all the way to the right, I figured the date code might be the "0039" number? Maybe the 39th week of 2000?Anyway, I'm wondering if that SMX2-87 chip is the same as the 921606 on the other two meters - the 87-iii in the center and the Cat-3 87-i (87-ii) on the left.

author: bluey
author_rank: Regular Contributor
timestamp: June 06, 2020, 03:05:04 am
content: Fluke service manual rev 5 1996 says they are the same.

author: ogdento
author_rank: Regular Contributor
timestamp: June 16, 2020, 10:33:10 pm
content: hey thanks bluey,i always assumed the smx2 was a new chip... didn't think to look for it in the 87-i manuals!!
funny names for certain catagories of equipment - Page 1
Forum section: electronics / repair

author: coppercone2
author_rank: Super Contributor
timestamp: October 23, 2022, 04:50:15 am
content: So I got one, this amplifier is hitting a current limit pretty low on one of the rails, damn you HP.Given all the work that I put into the device, I dub it, the "Vamplifier" because its just draining my finances.🧛
Funny simple repair of my microwave oven - Page 1
Forum section: electronics / repair

author: joeqsmith
author_rank: Super Contributor
timestamp: January 30, 2022, 04:55:14 pm
content: I just repaired our humidifier (lasted about 5 years before thermal fuse and element went out) and went to heat up my coffee and the microwave died. I trip the circuit breaker and got out my long chicken stick. Wife decides to watch so I explain about the number of fatalities from idiots doing home repairs. I discharge the cap and strap it. Then pull the main power connector, just in case... I show my wife how the capacitor is in the far back of the unit away from everything else, I assume for safety. I pull the HV diode and check it. Good. I then check the capacitor. Good. I check the HV transformer for leakage and resistance. All good. Finally, I check the magnetron. It was good as well. After 30 years with no soft start, seems the slow blow fuse just had enough and opened.Looking on-line for a fuse, they show it as 1" cube which it's not so I send my wife off to pick up a new one at the repair center. The person who was helping her asks what it is out of. She says our microwave oven. This ends with service person explaining how they will not sell ANY parts for a microwave oven to the public. They explained how dangerous they are to service and the liability.That would have been the end of it, but my wife, who really knows very little about repairs and electrical devices tells them that I'm a EE. They seemed none too impressed with that. So she continues to explain my telling her how dangerous they are to work on and how I showed her some part that was stuck in the rear of the unit for safety reasons. She then described how I pulled out some long pole with a wire on one and used it on that part before getting started. The service person has a change of heart and sells her the fuse.Yes, it's running fine.

author: CaptDon
author_rank: Super Contributor
timestamp: January 30, 2022, 06:03:26 pm
content: My Mom fat fingered the time setting to cook a potato and ended up with a small fire inside the oven. A one time thermal device on top of the cavity tripped. No one would sell me a replacement and this oven was a built-in costing hundreds to replace. Screw that!!! I took the little device apart, reset the little clicker disc and reassembled it. All is well. I can buy gunpowder in quantity, but I can't buy a non-resettable Klixon!!!! Sadly, buy not selling the safety part most people will just bypass it creating a REAL fire hazard!!! Another safety rule creating the real hazards!!!
FY6800 TFT Screen - Page 1
Forum section: electronics / repair

author: Ariamella
author_rank: Contributor
timestamp: November 05, 2019, 03:39:28 pm
content: Hi, long-time lurker here! Anyone know what TFT screen the FY6800 takes? I...think I might have broken mine, and I want to replace it. There isn't any model number anywhere on the PCB that I can find so I'm turning here for help!

author: Miti
author_rank: Super Contributor
timestamp: November 06, 2019, 12:15:47 pm
content: Take a look at this:https://www.banggood.com/HD-2_4-Inch-LCD-TFT-SPI-Display-Serial-Port-Module-ILI9341-TFT-Color-Touch-Screen-Bare-Board-p-1549806.html?rmmds=search&cur_warehouse=CN#jsReviewsWrap

author: intabits
author_rank: Frequent Contributor
timestamp: October 10, 2020, 12:19:34 am
content: Quote from: Ariamella on November 05, 2019, 03:39:28 pmDid you find a replacement?Was the one suggested suitable?Mine is flaky: it dims, then goes black. Works again when it wants to.
FY6900H-100M Not working anymore, worked before for 1 day new. - Page 1
Forum section: electronics / repair

author: Pro443
author_rank: Newbie
timestamp: June 10, 2024, 07:14:30 pm
content: Hi there!So, after 1 day ist stopped working, the all 3 channels inkl the counter, are dead. Is it worth to repair, or maybe someone shall have an interest to buy it as is.So, bought by banggood mid 2023 have not been able to Test it bis i had a relyible source, the gpsdo mid tis year. Connected and the FY had terrible 500Hz + deviation and temp instability of 20Hz+ at one ouhr (at 10MHz). Luckily it is a soft correction function. And i been using it for 5 Times. After that i nave put it in the Standby mode and the next morning its dead.What works now is the LCD, buttons and new Programm sees the Gen and can make a programming.So, how i do repair this not having schematic? Some Photos are there, incl. Thermografie. Its Power on.Thanks in advance,Vadim.PS,I cant Upload Photos, how do i?

author: Pro443
author_rank: Newbie
timestamp: June 11, 2024, 02:20:25 pm
content: Some Pics as links.https://paste.opensuse.org/pastes/380db8926b3ehttps://paste.opensuse.org/pastes/24335bc230c9https://paste.opensuse.org/pastes/a1de744ab62bhttps://paste.opensuse.org/pastes/82a21b6b3b0chttps://paste.opensuse.org/pastes/8e868dc251eehttps://paste.opensuse.org/pastes/7f2f5440754dhttps://paste.opensuse.org/pastes/ce5980ac0b2ahttps://paste.opensuse.org/pastes/145940102635https://paste.opensuse.org/pastes/d018adc67305https://paste.opensuse.org/pastes/0cd1a0c80535https://paste.opensuse.org/pastes/93221de205c8https://paste.opensuse.org/pastes/d793389f33f7https://paste.opensuse.org/pastes/5b9dcb77a7ddhttps://paste.opensuse.org/pastes/b9f86cde8351Thanks,Vadim.
G0HZU - E4438C PSU Repair - Can't PM Reply (Updated Title) - Page 1
Forum section: electronics / repair

author: Tony_G
author_rank: Super Contributor
timestamp: December 12, 2023, 02:47:16 am
content: [Bugger - I had the wrong title]Hey Jeremy,I tried to reply to your PM but I got:Anyway, here is my reply - Please shoot me your email as a PM if that block is some random forum bug and we can take this offline...QuoteSorry to take up board bandwidth with this.TonyG
GA4024_IVO - Page 1
Forum section: electronics / repair

author: tugrafal
author_rank: Newbie
timestamp: March 31, 2025, 06:23:11 pm
content: Hi there,I'm locking for a small 3.9" Display von IVO (GA4024).C't find it on the net. Anybody got a spare one or know where to buy.thanks for the help.kind rehardstugrafal

author: coromonadalix
author_rank: Super Contributor
timestamp: April 01, 2025, 10:14:59 am
content: used in thishttps://www.eevblog.com/forum/testgear/owon-odp6033-triple-power-supply-teardown/
Galaxy S6 Touchscreen Unresponsive - Page 1
Forum section: electronics / repair

author: njmicheli
author_rank: Newbie
timestamp: July 18, 2020, 01:36:32 am
content: Greetings.Problem:I have a Samsung Galaxy S6 whose screen suddenly stopped responding to any input.Useful info:The HOME, POWER, and VOLUME buttons are working correctly.I have booted in SAFE MODE to rule out the possibility that an app may have cause this. Still no luck.My Next Steps:- Remove SIM card, power on, test screen.- Backup via USB and attempt factory reset.- MINI PROBLEM: I cannot access the files on PC without selecting "Allow" on the phone.... via touchscreen. Is there a way around this? It seems the phone defaults to charge-only mode with USB unless changed on the phone each time its connected.- I ordered a tool kit so I can open it up. I was going to check the connections and... make sure its dry inside. (who knows what happens with kids in the house).- Luckily my wife has the same exact phone and recently bought a better phone. Worst case, my digitizer is dead and I can steal hers and backup my data.What else would you all try? Any tricks, tips, shortcuts? I'd really be interested in getting around the USB thing. Any help is appreciated.Thanks

author: de_light
author_rank: Regular Contributor
timestamp: July 20, 2020, 06:24:39 am
content: Buy a USB on-the-go adaptor and then plug a mouse into the adaptor. You should be able to then at least retrieve your data by using the mouse to accept the USB connection.Check the screen cable for damage and where it connects onto the board. Remove the connector, clean the port with a cotton tip and see if there is any damage to the pins. Reseat it and take it from there.
Thermometer ASL 250 / Gallenkamp Autotherm II service manual wanted  - Page 1
Forum section: electronics / repair

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 09, 2024, 10:04:08 am
content: HelloI have a thermometer Gallenkamp Autotherm II in very good shape but faulty I have Error 1 and Eror 2 when the system startDoes someone have a copy of the service manual ? even a user manual ?I also need the pinout of the sensor connector ( front panel )Thanks in advanceRegardsOS

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 10, 2024, 06:59:58 am
content: HelloSome pictures of the thermometer , interesting '' transformer '' insideRegardsOS

author: doktor pyta
author_rank: Frequent Contributor
timestamp: June 10, 2024, 11:23:46 am
content: Search for ASL F250

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 10, 2024, 12:25:30 pm
content: HelloThanks for information as Autotherm II is a rebranded ASL 250So Error 1 is generated by power on with connected probe , not really a defectError 2 is more strange as there is any probe connectedI link the ASL 250 user manual and here after the error listError listError CodesError codes can be generated by the F250 for a variety of reasons as follows.Code Meaning / CauseE1 Balance error / No PRT, PRT open circuit / Ratio over range.E2 Temperature over range / PRT at temperature outside limits of conversiontable.E3 No "A" ROM calibration/ No ROM calibration on selected Input or ChannelE4 IEEE or RS232 error / Unrecognized instruction sentE5 IEEE or RS232 error / Illegal argument sentE6 RAM failureE7 Data validation error in CAL ROM “A” or “B” - PRT calibration invalidE8 Unable to track temperature change / temperature change too largeE9 Conversion table too big (more than 395 points)/ Resistance range too greatE10 Unable to create resistance/temperature conversion table.E11 Unable to create resistance/temperature conversion table.RegardsOS

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 10, 2024, 02:34:56 pm
content: HelloI have the ASl 25 pin out for the connector , as I have an ASL 25 I will check in detail what is this schematic sensor or panel side ??RegardsOS

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 12, 2024, 12:33:48 pm
content: HelloOn my ASL250 / Gallenkampthe wiring is the same as the wiring of the ASL25 , ground is the top pin ''green '' green is connected with the metal enclosureI link some pics and the doc of the socketRegards
Gaming Keyboard: Razer Huntsman Tournament Edition, Model Number: RZ03-0308 - Page 1
Forum section: electronics / repair

author: fixitronix
author_rank: Newbie
timestamp: January 20, 2024, 03:57:40 am
content: Hello, guys. Does anyone know if there is a schematic diagram available for this keyboard? Or, does anyone know the Product ID of LN33?

author: ataradov
author_rank: Super Contributor
timestamp: January 20, 2024, 04:17:55 am
content: Quick search - LDLN025M33R. It is a voltage regulator, if it is getting hot, then it is likely that something else it powers is blown.

author: lugaw
author_rank: Regular Contributor
timestamp: January 20, 2024, 05:55:33 am
content: I also have this keyboard and need to fix it because the RGB light system has intermittent problems. Sometimes it works and sometimes it's not working. The keyboard is working fine and it's my favorite of all my mechanical because of how nice to type on it.
GAP1093 phototransistor for OPM4 fiber meter needed. - Page 1
Forum section: electronics / repair

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: October 31, 2023, 07:56:46 pm
content: I'm looking for replacement for this photoelement on the fiber meter made by Noyes OPM4.It's marked as GAP1093.

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: October 31, 2023, 07:59:24 pm
content: Here are pictures of meter and the sensor

author: Kleinstein
author_rank: Super Contributor
timestamp: October 31, 2023, 09:17:55 pm
content: It is very likely not a photo transistor, but a photodiode. Optical fibers often use some 1.55 µm and thus can not use si detectors anymore. With the longer wavelength materials phototransistors are not at all common - likely not available at all.

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: November 01, 2023, 11:51:54 am
content: I've done some google-fu and nothing came up, you are most likely right.So... if they are not silicon based... what would be the material used for the detector part.

author: Kleinstein
author_rank: Super Contributor
timestamp: November 01, 2023, 02:27:05 pm
content: My best guess on the detector material is InGaAs, as this is good to some 1.8 µm wavelength and still available as a standard type. Even mouser has a few in stock.Another possibility may be using a thermopile to get a wavelength independent response, though at a much lower sensitivity and thus only a thing for relatively high power.

author: Haenk
author_rank: Super Contributor
timestamp: November 01, 2023, 06:06:17 pm
content: https://www.aflglobal.com/emea/-/media/Project/AFL-Global/Product-Specification-Sheet/Test-and-Inspection/Optical-Loss-Testing/opm0-00-2000.pdfIt has wavelengths and type of detector - which might help to find a replacement.
Gardena R70Li main board repair, what component is it? - Page 1
Forum section: electronics / repair

author: sailor83
author_rank: Contributor
timestamp: May 02, 2020, 05:14:22 pm
content: I've been fault searching on a main board for a Gardena R70Li robot lawnmower.One output, the left one is faulty, by changing motors, the oposite doesn't work.I've found this to be faulty:But what is it? the left to legs are shorted.It looks like the writhing says:F (logo) 1E34ACFDD8424HIt's probably a TO252 DPAK package, the centre circle says AB.I've been trying to googling the component, but can't find it, any suggestions?

author: sailor83
author_rank: Contributor
timestamp: May 02, 2020, 05:19:51 pm
content: You always figure it out after asking for help..Probably this one:https://no.rs-online.com/web/p/mosfets/6710356/?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 03, 2020, 03:38:20 am
content: Never saw that type of case

author: pico61
author_rank: Contributor
timestamp: May 04, 2020, 10:20:45 pm
content: Yes, most likely it's it.On the other hand, mosfets are used as drivers of DC motors.If one end of the motor is connected to the component, then it's definitely a mosfet.

author: sancho_sk
author_rank: Newbie
timestamp: May 29, 2021, 07:35:58 pm
content: Not sure if this is still helpful, but in my R70li the part is AOD609.Here is the datasheet.https://www.tme.eu/Document/435d6c3893606163299f67de36ec8c28/AOD609-DTE.pdfUnfortunately, on mine not only the output FET burned, but so did the BC817 that is driving it and also the 74HCT365 that provides the signals as a buffer from the CPU...So, my fix will not be as easy...
Garmin 2597 LMT Circuit Board Repair/Component ID - Page 1
Forum section: electronics / repair

author: Quasimodo
author_rank: Newbie
timestamp: October 21, 2019, 06:36:58 am
content: Hi,I am looking at repairing this Garmin 2597 LMT GPS which I picked up recently.When the battery is charged, it works ok but the battery won't charge up with a wall/car charger nor will it run off the supplied power from either source.Initially I thought it would be a simple broken usb connector but removing the cover revealed more carnage inside.The small 6pin device (dimensions 2mm x 1.25mm) under the silver square is blown out.When plugged into a computer USB port, it seems to drag down the USB circuit of the computer with mice/keyboards ceasing to function.The markings on the damaged chip seem to be either CO7NN or CD7NN although it is a bit difficult to read where it is damaged.The only reference I can find to these markings is an Chinese document which is a list of chip markings onwhat they call "Power Current Limit Switch Chip Screen Printing BXXXX Package SOT23-5 Model SFST0012"I am pretty sure the blown device has 6 legs though.Does anyone have a clue to what it might be or how to identify it further?Thanks in advance for any help.Dave.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 21, 2019, 10:27:08 am
content: smt code bookhttp://www.marsport.org.uk/smd/mainframe.htmco7 gives this ??C07 DDX143TU Dio DO SOT363 dual dtr pnp/npn 50V 0.1A R1 4k7C07 DDX143TK Dio DO SOT26 dual dtr pnp/npn 50V 0.1A R1 4k7

author: amyk
author_rank: Super Contributor
timestamp: October 21, 2019, 12:03:33 pm
content: Code:C07xx DCX143TH SOT-563 COMPLEMENTARY NPN/PNP PRE-BIASED SMALL SIGNAL DUAL SURFACE MOUNT TRANSISTORCOxxxAAT4280IGU-1-T1AAT4280SOT23-6Slew Rate Controlled Load SwitchCheck the pinout and where the traces go. If pins 4 and 6 are connected together, as well as 2 and 5, then it's probably the second one; otherwise it could be a complementary transistor but I doubt it. A load switch makes far more sense in this application.

author: Quasimodo
author_rank: Newbie
timestamp: October 26, 2019, 03:20:48 am
content: Thanks everyone for the leads - will check the pin connections when I get some spare time in the next few days.I will report back if have any success.
Garmin dog collar - Page 1
Forum section: electronics / repair

author: mandor
author_rank: Regular Contributor
timestamp: August 21, 2025, 05:11:42 pm
content: Hello.My step father asked me to change the GPS antenna on the dog collar.I did it once before on another collar and that one worked so I just went and did the same with this one.But it doesn't turn on. Sadly, I didn't check if it worked before I opened it. So I asked if it had worked before at all and he doesn't know because it's not really his. He got it as defective and was told the antenna but might nt have worked at all.It does connect to USB and seems to be charging. The battery is at 3.8V. I managed to update the software on it through Garmin web updater to v5.3 i think.The model shown on the web updater is TT15.When I connect the battery there are a few flashes and beeps and then it turns off.I can't turn it on with the button.What can I check? anyone has any experience with this?The video of it is here. Much easier to see what's going on than to describe it.https://youtube.com/shorts/9sI6nYscDyQ?feature=shareI don't have much experience in repair. I have quite a few tools, though.Thank you.
Garmin Echo 101 - Page 1
Forum section: electronics / repair

author: sknepscheld
author_rank: Newbie
timestamp: July 28, 2020, 08:46:02 am
content: HiI am busy repairing a Garmin Echo 101 device that has a blown IC.The only information on the IC is IV7DF. (See attached foto)I am not able to find this component or any replacement.Are you perhaps able to assist me to identify the component or a possible replacement?RegardsSpidey

author: Per Hansson
author_rank: Unknown
timestamp: July 28, 2020, 10:42:10 am
content: OP crossposted here:https://www.badcaps.net/forum/showthread.php?t=86908

author: LateLesley
author_rank: Frequent Contributor
timestamp: July 28, 2020, 11:44:38 am
content: From what I can find, It may be a MP2451DT.https://www.aliexpress.com/i/4000255804261.htmlhttps://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20200728034120&SearchText=MP2451https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2451/
Garmin ECHOmap 92sv repair questions  - Page 1
Forum section: electronics / repair

author: billtsig
author_rank: Newbie
timestamp: August 19, 2024, 06:04:36 pm
content: Hi everyone!recently a friend gave me the marine gps (garmin echomap92sv) to be more specific my friend went the gps to garmin service but they said that it needs a new motherboard and it can't be fixedso he bought a new one and game me the defective one and told me "keep it and if you can fix it it's yours"at first i plug it to my bench psu with 12v and the device consumed about 50mA and every 1 sec about 100mA (as a pulse) later it turned on it's self and was fully functional for about an hour until it stopped working againafter that i took some measurements to all the smps rails and the voltages was present without short circuitsthe only abnormality i found was at the multi smps chip (let me call it multi chip) that none of the voltages was present and on one of it's coils a short pulse every 1 sec 0-5V was herethere was no short circuit either, sadly i didn't manage to get a datasheet for the chip (sn140502 texas instrument) or a garmin service manualim thinking that the control chip still see an error and does not the smps let to start but i can't identify the errorpcb images:https://freeimage.host/i/dMLnnDPhttps://freeimage.host/i/dMLnCOBhttps://freeimage.host/i/dMLnqHQhttps://freeimage.host/i/dMLnKUxi would be very happy if anyone could help me with directions to repair it because i own a small boat and it would be much better than my android phone im currently using now as a gpsthanks for your timeVasilios
Garmin GPS 12map - Page 1
Forum section: electronics / repair

author: rz
author_rank: Contributor
timestamp: November 07, 2019, 03:35:42 pm
content: I've got a dead Garmin GPS 12map. It doesn't switch on, no display and welcome screen. I opened the case and tested the memory battery voltage, 0.5v. So, I desoldered the memory battery. After that I tested some voltages. When I push the power on button, Vcc of 80386 and AM29LV160BT are about 3.0V. Vcc of LP324 is about 25v. Frequency CLK2 of 80386 is 33MHz, CLKOUT is 16.5MHz. RESET pin is 3v, and no high-to-low transition. That's all I have tested.Is there some service manual or knowledge to repair this GPS? I like the GARMIN GPS 12 series very much, quality PCB and components, solid case, simple and clear display. Hope it can works again.Thank you.

author: DRM2
author_rank: Newbie
timestamp: April 26, 2020, 03:27:57 pm
content: same exact issue here.did you ever resolve it?

author: coromonadalix
author_rank: Super Contributor
timestamp: April 26, 2020, 04:48:48 pm
content: An intel 386 sx in there ? seems to pack some punch ??

author: rz
author_rank: Contributor
timestamp: March 31, 2023, 04:28:43 am
content: Quote from: coromonadalix on April 26, 2020, 04:48:48 pmit's a intel 386ex, embedded variant of 386sx.

author: eTobey
author_rank: Super Contributor
timestamp: March 31, 2023, 05:50:41 am
content: I once fixed my HDD with reflowing it in a pan. This might work here too?
Garmin Nuvi 50LM GPS - Page 1
Forum section: electronics / repair

author: vidarr
author_rank: Frequent Contributor
timestamp: August 14, 2022, 05:27:48 pm
content: My GPS just stopped working. I updated the maps for the first time, then, later that day, it failed to turn on.I tested the voltage and the power is coming in from the cord. I just don't know what to test next. Any advice would be much appreciated.Thank You!

author: coromonadalix
author_rank: Super Contributor
timestamp: August 15, 2022, 01:57:16 am
content: would it start if you remove the battery ??and garmin a notoroius with their usb cables, some generic cable will not charge the device on some models ... not sure if this one could be affected, unless you have the originals garmin ones ...you have some forums of garmin stuff on the web

author: vidarr
author_rank: Frequent Contributor
timestamp: August 15, 2022, 01:37:12 pm
content: I don't know if it is the original cord, but probably. It is the cord I've been using for like ten years. I tried to start without the battery and nothing.I found one Garmin forum and it had nothing. Maybe I'll try another.Thank You!
Garmin Vector 2 / 2S Pedal Pod Repair - Page 1
Forum section: electronics / repair

author: smilgy
author_rank: Newbie
timestamp: August 01, 2023, 11:21:17 am
content: Hi All,Any thoughts on how to potentially repair this cable? Appears to have broken somewhere inside the black rubber casing, no continuity between pins and other end of ribbon cable going into a PCB. I suspect this has been the cause of the issue.Garmin no longer sells/produces this unit. I've searched everywhere to find a replacement but doesn't appear as though it is for sale anywhere. Aliexpress has some replacements of unknown condition, but for an extortionate price, hence makes it uneconimical to replace.Note, in the photos there is a break in ribbon, that happened during extraction from the PCB.Thanks!

author: drhex
author_rank: Regular Contributor
timestamp: August 02, 2023, 08:20:28 am
content: Can you get at the other end (even if you have to drill into the body behind the pins)? If so, bypass with external cables. Won't be pretty but should work. Are all connections broken?

author: smilgy
author_rank: Newbie
timestamp: August 02, 2023, 08:30:17 am
content: Quote from: drhex on August 02, 2023, 08:20:28 amUnfortunately I dont think it would be an option other than to prove it all works on a bench. I've attached a photo of the pedal where the previously shown connector connects to after the pedal is installed on the bike.

author: smilgy
author_rank: Newbie
timestamp: September 15, 2023, 11:10:13 am
content: In case anyone else finds this from a Google search. I did end up finding a replacement, from Garmin South Africa, whereas all other Garmin regions were sold out and no longer offering replacements. If you do need to order from Garmin SA, look for a retailer that can order direct from Garmin and they should be able to send the replacement to you. Good luck!
Gassner AA LR6 AM3 Alkaline Batteries - Page 1
Forum section: electronics / repair

author: reflowman
author_rank: Contributor
timestamp: September 06, 2019, 12:19:53 pm
content: 30 months ago I bought a load of wireless Thermostatic Radiator Valves (MAX EQ3).They came with two Gassner AA LR6 AM3 Alkaline Batteries each.I'd never heard of them and, as the valves are cranking "quite a bit" and the receiver is active all day long, I guessed the batteries would be dead in a year tops.But no. They've all kept going well past 2 years.I've no current consumption figures, but either Max know a thing or two about low power machinery or Gassner Battery Co. (Shenzhen) Ltd make very good batteries.Any experience of Gassner out there?
Gate Sensor  - Page 1
Forum section: electronics / repair

author: vidarr
author_rank: Frequent Contributor
timestamp: May 30, 2020, 07:13:35 pm
content: The wire pulled out of the plastic housing it was glued in with silicone. I tried putting the wire back in different positions, but it no longer detects the piston/gear. Does anyone know how the wires are positioned inside the plastic housing?Thank You!

author: rvalente
author_rank: Frequent Contributor
timestamp: May 30, 2020, 07:21:43 pm
content: Seems to be just a reed relay...

author: vidarr
author_rank: Frequent Contributor
timestamp: June 01, 2020, 04:24:01 pm
content: Quote from: rvalente on May 30, 2020, 07:21:43 pmYes, good job!!!I opened one up to see if I could repair the other. There is a magnet on the piston of the gate arm. When the magnet reaches the sensor, the reeds touch and the gate stops. I ordered new sensors, but for fun, I am going to try to fix the broken one. I have tiny glass tubing exactly like the attached pics.
Gateway EV910B CRT Monitor  - oops - Page 1
Forum section: electronics / repair

author: RufiS
author_rank: Newbie
timestamp: November 07, 2024, 11:34:17 pm
content: Was having issues staying powered on. Discovered the 20year old slow burn fuse was on it's last leg, connected but not actually attached. Replaced the fuse, device powered on. The original issue was the device would power on then just fade to 0 power after 10-20 seconds. Left device powered on with new fuse, came back 30min later to see if it was still powered on. Accidentally touched the - terminal of the full bridge to the what appears to be Isolated ground chassis (side of the multi-meter lead brushed against it, I should have taped over it or had shorter leads, lesson learned). Big spark, fuse blew. New fuse, insta pop (***Edit***: upon inspection they sent me a 50ma fuse instead of 5A ***Edit***). Rectifier seems to test green when doing diode tests between it and the L/N AC, everything seems to only be able to move in the correct direction, no shorts. Thinking hopefully the DC/DC switching IC may have gotten damaged, but not sure if that is going to be a red herring because I'm still a bit new at this. Anyone have any thoughts? Suggestions? New fuses set to arrive next week, 10 this time.Schematic is on page 46/47 of the PDF

author: RufiS
author_rank: Newbie
timestamp: November 12, 2024, 07:06:14 pm
content: New fuses came.Powered up.(Sounds like something is happening when connected to power and fuse is not blowing) Will connect later and see if it works.

author: RufiS
author_rank: Newbie
timestamp: November 13, 2024, 02:16:14 am
content: When I measure voltage on C907 I am measuring at the points circled in power.jpeg. The diag tree in No Power.jpeg says I should be getting 390VDC, I am getting ~169VDC. I am also powering it from 120VAC. Should I be getting the 390VCD the diag says, or would that only be if I was using 240VAC? I can hear something when connecting the device to power, but the power light never illuminates. Thinking maybe the power button needs to be replaced, too many presses? But with the voltage I am seeing, vs what the diag says I should be seeing, I'm not familiar enough. RMS calculations say I should be seeing about what I am seeing, but I'm not certain due to the diag tree.

author: RufiS
author_rank: Newbie
timestamp: November 15, 2024, 04:30:13 am
content: After connecting, there is no led light (when i had it apart i had it face down in folded towels and could not see the led), and pressing power causes no change. Going back to no power diag tree when we have a cool night. In the meantime. Why does the KEY line never show up again? I find it here but nowhere else. Refer to schematic pg 46.
GDM-461 (GW Instek) Uni-T UT61E  Repair - Page 1
Forum section: electronics / repair

author: jappietoutou
author_rank: Newbie
timestamp: February 14, 2021, 11:24:47 pm
content: HelloThis is my first post , 4 years ago I bought a GDM-461 in an auction here in Montreal, I've been using the meter since and it works perfectly , until I forgot the power on and drained the 9v battery. When I replaced the battery, something went wrong, smell and hot battery. So I searched the 'net' and found lots of info on the UNI-T which is the same as my meter. So with the info I found on this forum I was able to repair my meter. And of course I made a Video !! one in French and one in English....Jean-Pierre
GDM 8246 Cal Referance needed After an accidental deleted 5M Range [SOLVED] - Page 1
Forum section: electronics / repair

author: Labrat101
author_rank: Unknown
timestamp: October 26, 2020, 07:07:45 pm
content: Hi All ,I was wondering if any one has ever calibrated an INSTEK DGM 8246. Dual DisplayI have the Full service Manual for the GDM 8245 which is supposed to be the same except for the interface plug.I had a problem with the 20M range it was out by 3 or more meg .So I followed all the procedures as per the Manual only to find some were not good for my Model or VersionAll was going well I did the CL10 CL20 & CL40 400m. Short ShuntUsed the heavy short . and all was correct.Then I only had to Cal the 20M range with a 9.90M. (CL50)It Calibrated and then I got distracted and Pushed the Auto/man without the shift to EXITIt reset the 5M range out . and the 20M is F..K and reads 5meg with a 10Meg test resistor.The Manual said it requires a 3Megfor the 5M range .. some how its wrong and now that range is out.That was correct. is messed up now.Has any one ever calibrated one of these GDM 8246 need 1 to 4.9999M & 20M Rangesall the other ranges and voltages are correct its just the Meg Ohms .UPDATE .. Assuming the Manual is correct and I have a slight different version.There are a few miner component differences from the schematic . to my board .All the voltages are spot on . except the 6.2v ref which reads 6.8vmy board has the LM399 Precision Reference rather than the 6.2v zenerThe Meg ohm ranges were out of cal. when I got it S/H about 3 yrs back.only about 3 - 4 meg on the 20m range.I really like this meter and did not want to spend $400 to get same qualityAny help would be More than welcome . Or suggestions on this problemAlso I do have the Full Service Manual for these GDM 8245 If any one is interested .

author: Labrat101
author_rank: Unknown
timestamp: October 29, 2020, 06:08:02 pm
content: Hi to any one who read this.Problem Solved Thanks to Goodwill Service contacted me .With the correct values .So all is Good .

author: rob blue
author_rank: Newbie
timestamp: November 21, 2020, 12:14:00 am
content: Hi Labrat101What are the correct values?

author: Labrat101
author_rank: Unknown
timestamp: November 21, 2020, 09:25:49 am
content: Quote from: rob blue onTodayat 12:14:00 am
GDM-8251A Intermittant reset - Page 1
Forum section: electronics / repair

author: negativ3
author_rank: Regular Contributor
timestamp: June 01, 2020, 06:06:39 am
content: Hi,I have the GDM-8251A DMM which has developed a fault in the last day or so. Around every 2-3 minutes it does a power on reset cycle, doing the self-tests then displaying the measured voltage (3.3V currently) correctly..This happens at different mains power outlets, and with or without a voltage being measured.Display at power-on:V2.30PARA:DEF RECALLRS232 IOAll seems to be default as per the user manual.No codes or anything to indicate a fault, just a few relay clicks, display refresh and back to measurements.Does anyone have any insight before I tear it to bits?ThanksAndy

author: odium
author_rank: Contributor
timestamp: June 01, 2020, 02:49:23 pm
content: hi,Maybe you have some thermal problem which triggers protection circuit.Anyway, before getting down the rabbit hole, you can try this basic test, saveuser settings to default boot config and see if the device stops rebooting.this will allow you to discard potentially corrupted boot settings.doc :https://www.gwinstek.com/en-global/download/downloadFile/9122hope it helps.cheers.

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 01, 2020, 08:21:24 pm
content: 2-3 minutes sounds a little long for corrupt EEPROM settings, thermal sounds more likely.Considering it has a compact SMPSU I'd start there, next suspects would be low voltage linear regulators for CPU, FPGA... if there are any.

author: negativ3
author_rank: Regular Contributor
timestamp: July 28, 2020, 04:24:18 pm
content: Apologies for the late response, life took over for a while...Ok, after cracking the case, this meter only has a single output 5V PSU from meanwell. I measured the output at the meter PCB and it was dropping all the time, from around 4.9 to 4.6V before I stopped measuring.Measuring at the PSU output gives a solid 4.975V.So... used a couple drops of Deoxit grease on all the contacts, and so far no resetting. Hoping for the best.

author: krzysssztof
author_rank: Contributor
timestamp: July 30, 2025, 08:17:41 pm
content: Old topic, but for the record for other GDM-8251A users : I observed what I believe to be similar issue with my GDM-8251A.I have not used the device for a long time, and after power up everything seemed to be fine, but shortly after device started resetting randomly, screen brightness started flickering, sometimes the device hook up completely.After a longer time (to self-heat maybe?) device seem to work just fine. That might indicate problem with 5V supply or rusty connectors. I will keep observing and if the issue continues I will post here.
GDS-2202A oscilloscope waveform does not know for help - Page 1
Forum section: electronics / repair

author: weixiuniuniu
author_rank: Newbie
timestamp: April 18, 2025, 08:22:12 am
content: GDS-2202A oscilloscope waveform does not know for help,At the red mark in the picture, channel 1 shows abnormal,ask for maintenance ideas.Use oscilloscope with square wave, 2 channel normal.It's strange that channel 1 is basically normal within the green circle
GDS810s - Page 1
Forum section: electronics / repair

author: madeeb
author_rank: Newbie
timestamp: November 30, 2020, 08:41:35 am
content: Grating to allI have a problem with my GW instek GDS-810S Oscilloscope. The soft ON/STBY switch doesn't work probably, I tried to change D-type filp flop TC4013 but the same problem still exist, so if any body can send me the schematic circuit diagram(data sheet) of LYTEC LP5422 vir:1.2 Power supply board, i would be grateful.Thanks

author: JKKDev
author_rank: Regular Contributor
timestamp: November 30, 2020, 11:50:30 am
content: Can't help you with the schematic but I think you should first find out if the button works as intended. Then check the button input (voltages). If present trace the output. If not present, find out where you lose the signal to the button.

author: madeeb
author_rank: Newbie
timestamp: December 01, 2020, 06:43:19 am
content: Thank you for your consideration. I checked the button and its ok. and traced the output which connected to the clock of 4013 D-type flip flop.and i finally find the schematic
GE Clock / Phone Combo 7-4719A Clock Works but Radio Not Working - Page 1
Forum section: electronics / repair

author: allen305
author_rank: Newbie
timestamp: August 27, 2021, 10:26:54 pm
content: I have a GE Clock / Phone Combo, model 7-4719A purchased new, which has a working digital clock and phone, but the radio is not working, no sound. I requested a service manual and schematic from Rick, StereoManuals.com, but I have not received a reply. Any suggestions on obtaining a service manual / schematic or repair ideas would be appreciated. Thanks!

author: bob91343
author_rank: Super Contributor
timestamp: August 27, 2021, 11:34:39 pm
content: GE was bought out by Black and Decker many years ago. Try contacting them.

author: allen305
author_rank: Newbie
timestamp: August 30, 2021, 01:58:40 am
content: Thanks for the suggestion. I will check Black & Decker.

author: BrokenYugo
author_rank: Super Contributor
timestamp: August 30, 2021, 06:17:10 pm
content: SAMS offers one for $23, some libraries have a digital subscription but it looks like they offer that one as hardcopy only, first time I've seen that, low demand I guess.No sound at all, or just very low volume? Probable failure is a small electrolytic capacitor coming off the volume control, feeding into the audio amplifier, they dry out and stop passing signal. But you really need to get in there, trace out the audio circuit and start testing parts or see where the signal stops with a scope or amplified speaker to be sure.

author: pcwrangler
author_rank: Regular Contributor
timestamp: August 30, 2021, 08:33:50 pm
content: A trick(cheat?) I use for audio circuits is to use a Fluke Networks Pro 3000 or similar non contact probe to trace the audio(https://www.fluke.com/en-us/product/network-cable-testers/copper/pro3000probe) Wave it over the circuit to locate the area where audio stops and investigate deeper. It has saved me more time than I can measure. If you don't have a similar probe, ask a computer or network buddy. Good luck.
GE induction range PHB920SF1SS error F640 - Page 1
Forum section: electronics / repair

author: JBeale
author_rank: Frequent Contributor
timestamp: November 07, 2019, 07:23:41 pm
content: Trying a long-distance diagnosis. My mom got a GE induction range, model PHB920SF1SS. She has been very happy with it for 5 years until it stopped working, displaying error code F640. She wants to get it fixed if at all possible. The nearest service guy willing to visit was out of state (!) but he did drive up and replace the "control panel top circuit board". That didn't work. He made another trip to replace "lower circuit board" but that didn't work either. He spoke with GE, and they had no other suggestions, so he gave up.The most relevant information I can find is this thread:https://www.applianceblog.com/mainforums/threads/phs925st2ss-ge-profile-error-code-f640.55548/Error F640 may mean 'No LIN comm between main logic board and Induction bridge board.' with reason A) Harness opened to bridge board. B) Induction module, or bridge board not getting power.if no power to bridge board, might be failure in another part, a "filter board" which may be susceptible to power surges. The house in question is at the far end of a rural electric grid and the power does go out occasionally with summer thunderstorms. It is also very humid all summer, which might promote corrosion somewhere. Any other ideas?