Bad Zener Diode

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  • unimatrix93
    TV backlight zener diode
    by unimatrix93
    Hello everyone, I'm repairing an LG TV backlight and I noticed some strange behavior when I touching the backlight strip with a missing Zener diode.

    So I replaced the leds on the strips and they seemingly working fine, but soon as I touch the strip which has a missing Zener diode the whole backlight turns off for a few seconds and then turns back on.

    Is this caused by the missing diode? If so what kind of zener diode should I use to replace it?.
    ​​​​
    The led strips has 9 6V leds.


    ​​​
    1 Photo
    02-10-2025, 12:13 PM
  • sam_sam_sam
    NTE Electronics “NTE5251K” Zener Diode 9.1V @ 50W Do-5.5% Want to build a 9.1 output from a 9.6 lipo4 battery pack
    by sam_sam_sam
    I have bought this Zener Diode for this project what size and wattage resistor value do I need to use to get near 50 watt output
    I bought this from an eBay seller but unfortunately they only had one

    I bought three from Vetco Electronics these are Sylvania ECG5185A 9.1@10w A to Stud what size and watt resistor do I need to use to get near 10 watt output
    I bought three of from them to also make battery packs with this output power limit in mind

    I want to use this battery pack and turn it into a 9.1 output battery pack output to eliminate using 9 volt battery...
    04-23-2025, 05:50 AM
  • hobostove
    Corsair RM1000e - Help identify 5VSB Zener diode
    by hobostove
    Hey there guys. I've got a Corsair power supply that's come across my bench dead. I usually don't mess with power supplies, but it's a slow week so I'm giving it a whirl.

    Taking it apart I heard a screw rattling around inside, and when I got it apart I found a couple blown components near what I think is the 5VSB area.

    There's a 22ohm resistor that's melted and open, but it still has the bands.

    The other part is a zener diode and it's top went to jesus, so I can't read the marking.

    It looks like the diode connects the source and drain of a TNY284...
    03-27-2025, 02:25 PM
  • debidoobs
    Yamaha delay D1500, zener diode broken with no marking
    by debidoobs
    Hello,

    im actually trying to save a d1500 delay from yamaha. I found the service manual but schematic is missing and BOM list is a bit unclear as components listed have no reference linked to the pcbs... In my case, one zener diode was broken (114 code on the pcb in attached file) and couldn't be repaired : it was a zener type package. In the BOM list i found 3 reference on this board : 1S555 (can be replaced by 1N4148), RD4.7EB2 (approx 5v rectifier), RD7.5EB3 (approx 7v rectifier)...

    Actually the cathode goes to VCC of sram M5M5118P, without this diode missing, i have...
    04-24-2024, 09:01 AM
  • jm1234
    T3D 21 - zener diode?
    by jm1234
    Hi,
    I'm looking at the power source module of my Panasonic plasma TV TX-P42ST50. The TV goes into suspended state almost immediately and keeps flashing 6 times.
    That zener diode is marked on the board with the diode sign (D204), that much I know. It seems to be open completely in both directions and its legs seem dark, as if it suffered some heat.
    I'm having trouble finding a replacement. Does 21 stand for 21V?
    The only other clue I have it is connected across 2 of the legs of a transformer (primary side).
    Any idea how to find a replacement?
    Thanks
    ...
    04-14-2024, 12:42 PM
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