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17IPS02-2 (technika 19in lcd No Power)

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blackillusion:
Hello all, I am very novice at all this my friend gave me this to tinker with. Dead 19in Technika.

So i opened it up IC800 had blown up so not so good. Replaced that. Replaced fuse and it blew straight away. Found 3 out of 4 of the diodes D800-D803 to be shorted so i have replaced them. No the tv doesn't blow fuses which is good right? But still no power. Could anyone give me some pointers into what I should be looking at?


thanks guys

edit: No 5v standby at L805

Trying to follow the schematic

Turnip:
Hi,

Often happens that the chopper feedback opto-isolator and associated zener diodes go phut after a chopper pop - wouldn't mind a copy of your shematic, don't seem to have one, but have several duff panels.

Good luck - Chris.

blackillusion:
Hi Chris cheers for the reply, I must say your all over these threads nice to see that.

I've attached the pdf I found.

I don't appear to have DC voltage anywhere. Tested the big cap with my esr meter and reading is fine. I will have a look at the opto-isolator.

blackillusion:
Just to update zener diode is shorted. Is there a way to test an optocoupler with a digital multimeter? It has resistance over 4-3 and over 1-2.

blackillusion:
Replaced zener and optocoupler. The Optocoupler that came off seems to be fine as similar readings as new one. The main capacitor when testing with the esr was rising does this mean it is leaky?

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