How can I in-board test a 203D6 IC?

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  • chth96
    How Can I test PWM DM0365R?
    by chth96
    Hello
    I have power adaptor(220V/input, 12V 1.2A/output) which has symptom of fluctuating output DC voltage between 11.5V-12.2V.
    So I opened its plastic case and when switched it on, I heard constant tik tik sound from inside its PCB.
    I measured DC voltage between negative and positive pin of the largest capacitor(400v 10uf) and it was measured contant 300V.
    I also measured ESR value of all capacitors and I noticed that one of capacitor(KMG 16v 470uf), which located in the secondary side, have high ESR value(10 ohm),So I replaced it with same specification NXH capacitor....
    06-18-2025, 04:14 PM
  • khelane
    test active pfc power with lamp test
    by khelane
    Hello
    I have a big problem and that is that in some cases when repairing active pfc power supplies I cannot work with a test lamp. I can only get help with 5 volts standby and for starting and starting I have to work without a lamp and this way there is a possibility of parts exploding and other parts being added.
    Sometimes with a multimeter test the problems can be reduced to some extent, but I had several cases that had to be tested on and online and recently two varistors exploded. They had terrible resistance because the power supplies were over 800 watts.
    Is there a way...
    06-03-2025, 01:00 AM
  • chronic519
    Mats / mods: detected and repaired GPU fault. Cant seem to test after!
    by chronic519
    Hello.

    GPU came in, green lines. Spent lots of time using to get the Mats / mods drive working (found on youtube).
    Found issue with a RAM block
    Replaced, green lines gone.
    Trying to test again, assuming getting the false positive. Originally had over 1K on a single bank. Now getting tosses low between banks.
    Used a good card to test and same results low errors 32+.

    I am just search for some form of command to do a full test on the GPU.
    I just ran the mats command with my good GPU and passed after roughly 40 min.
    The repaired one, ran...
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  • alltvrepairs
    Lg TCon test pins for screen test
    by alltvrepairs
    Hi,
    i have a 65 Panasonic TX-65HX710E using vestel 17MB170 main and Lg tcon.

    Few drops of water fell probably near COF and have no display. Tried removing tabs but no.part of display present as if tcon fuse open. However 12v is present and tcon can be felt warm enough that supplies are present. Backlight and sound ok.

    Anyone knows if this TCon 6870c-0805A has any special test pins for rgb test?

    Appreciate your help....
    2 Photos
    06-13-2025, 06:33 AM
  • signal.quest
    Samsung LN40C630K1F LCD TV No Backlights and Flashlight Test Fail
    by signal.quest
    Hi all,

    I have been working on a Samsung LN40C630K1F LCD TV. On power up the backlights only briefly light up when first powered on then they go out (2 seconds to black). The flashlight test also fails. The sound works fine. Please see attached pics.

    I have researched the forums a lot. I have watched the videos of trying to locate the bad CCFL or transformer and bypassing. I can't find any evidence of a bad transformer/CCFL. I verified I get 376V from the big caps to the fuse. I have used a small/cheap oscilloscope and it looks like the MOSFETs on the inverter...
    6 Photos
    09-30-2024, 11:21 PM
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