21SF8XEL 21" CRT TV ripped pads, PCB (kd -331 (v1.0) sh12144)

[GraphicMan]

Hello
someone forced the STR (FSCQ1265RT) out and ripped the pads off
now I need to reconstruct the tracks but I dont know how it will go (no prior pics before the damage)
Attached the affected area pic, pic 2 is the best i could found online for the same area

the pins from 1 to 5 are for the STR
any help is appreciated
Thanks

[R_J]

This schematic uses the same FSCQ1265RT ic (page 17) so you should be able to compare, I would need a picture of that complete area to do a proper trace. See if pin 4 trace connects to the optocoupler, here is my best guess

[GraphicMan]

This schematic uses the same FSCQ1265RT ic (page 17) so you should be able to compare, I would need a picture of that complete area to do a proper trace. See if pin 4 trace connects to the optocoupler, here is my best guess

yes indeed i agree with your assumption
i have shared a pic showing where is the opticoupler
now i need first to check that STR, see if it might be still good or bad, i know it is impossible to know for sure on cold testing but at least pass it
can you tell me how to test it for that?
thanks a lot for your help and time

[GraphicMan]

The TV worked again directly after a correct trace reconstructions based on your suggestion, will let you know if there are any problems, so far so good, thank you very much

[GraphicMan]

Now i am at the original problem the customer was complaining from, which is the tv works sometimes and then goto standby , then might work again by itself and so on randomly,
what do you think specially that i did not find any blown nor a swollen cap

[R_J]

What have you checked? have you checked any voltages? start by replacing the bad electrolytic capacitors in the primary of the power supply, you can't tell if components (caps) are bad just by looking at them. look at the schematic and replace the capacitors C509, C531, they will likely have different location numbers on your model.

[GraphicMan]

What have you checked? have you checked any voltages? start by replacing the bad electrolytic capacitors in the primary of the power supply, you can't tell if components (caps) are bad just by looking at them. look at the schematic and replace the capacitors C509, C531, they will likely have different location numbers on your model.

yes the 300v is about 334v ( i think while on sleep) i have pulled out the biggest cap on the psu and measured it good, i can replace also just to make sure, it is difficult to measure the voltages while on because the tv now barely turns on, it just switch back to sleep almost instantly giving me no time to measure anything, i dont have the schematics , do you mean i should looks for C509 and C531 and replace then where they are? or they might have different numbers?

[GraphicMan]

it looks like the main cap was the problem, i did replace it with a 450v 330uF instead the original 450v 150uF, according to my LCR the replacement was giving me 303uF but a bit less ESR, however it does have a belly on above and have been sitting for years with no use it looks like it did the trick, at the begining the tv did goto sleep but soon went back on by itself, the more i test the less the turning off, i know from experience that old caps need time to wake up again, only time will prove that
the other subject is that it seems like i cant find the right spots to measure voltages, all i was able to do is measuring the 5v and it was 7.4v dc
the other pads on the transformer (chopper i believe) are all giving me 0.2v, apparently i measuring in the wrong pad / pads, i was using the ground of the main cap, i shared a photo of the same model i have, can u point to me where i should probe? thanks a lot)

[GraphicMan]

The tv is working for longer times but it still goto standby , i tried to lower the brightness and contrast by a lot but it still shut down after few minutes or randomly , plz guide me where to check
thanks