Transistor Tester Help

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  • nubinator
    how can i test individual leds without tester
    by nubinator
    Hello I have TCL 65S4 and it has no backlight, seems common problem on this tv to have bad LED's. I have no tester though I thought I could just test each LED with 2xAA batteries for 3v but it doesnt light up at all?
    I saw a vid with LED tester on this TV and it had 130v for 1 good line which is 24 LEDs does that mean it needs around 5.5v per LED?
    10-25-2022, 11:05 PM
  • 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
  • sam_sam_sam
    EBC-X 8-Channels 18650 Battery Capacity Tester Charge & Discharge 10A Aging Test Modificatio
    by sam_sam_sam
    This is another battery testing machine that needs to be modified for the cooling fans because these are noisy but not as bad as one of the other battery testing machines that I had modified recently because of it being too noisy

    The battery testing machine is going to get two temperatures controlled cooling fans like one I put in the other battery testing machine I just have to remove the temperature sensor and relocate the temperature sensor to one of the heat sinks and put one on the other heat sink so the fan speed can be controlled by temperature

    https://www.eb...
    05-05-2024, 06:07 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...
    05-20-2025, 07:56 PM
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