Electronics > Repair

LG TV turns on for a sec then shuts off...

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inse:
Please re-read replies 4, 6 and 8, it’s a four stripe resistor with an additional parameter marking.
Did you locate a service manual?
Otherwise we have no idea which circuit parts you are talking about…
Can you supply a photo ofthe PCB top and bottom side?

DavidAlfa:
Normally this is a burnt led, still conducting a bit but causing huge Vf, triggering  OVP.

Lockon Stratos:

--- Quote from: inse on December 24, 2024, 09:20:24 pm ---Please re-read replies 4, 6 and 8, it’s a four stripe resistor with an additional parameter marking.
Did you locate a service manual?
Otherwise we have no idea which circuit parts you are talking about…
Can you supply a photo ofthe PCB top and bottom side?

--- End quote ---
Ok. Popped off the zehner and diode from the board. Zehner is still a short both directions, the diode also measures the same..... Ill try to dig up some schematics tomorrow, this is going to take a while.

Images:
https://content.section9.me/im/eev/top.jpg
https://content.section9.me/im/eev/bottom.jpg


--- Quote from: DavidAlfa on December 24, 2024, 09:34:20 pm ---Normally this is a burnt led, still conducting a bit but causing huge Vf, triggering  OVP.


--- End quote ---
Maybe, ill know more if i have found some sort of schematics...

u666sa:

--- Quote from: DavidAlfa on December 24, 2024, 09:34:20 pm ---Normally this is a burnt led, still conducting a bit but causing huge Vf, triggering  OVP.

--- End quote ---

This.  :-+

Lockon Stratos:
Ill look into that as well, at least i finally found the correct info for the board i have:
https://adjuntos.yoreparo.com/default/0007/06/8787c55ea551c12f230ce656a3db5ae95011a1ca.pdf
(I hope the IC didnt get fried, tried mouser and digikey but nothing comes up for that part number.)

Ill order the parts then i can test the led strip voltage during operation.....

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