Take a look for bad capacitors, but it's much more likely that there's a cold solder joint somewhere.
I'd start with the power supply circuit (be careful, discharge all large caps first) and just retouchup all the solder connections on the larger components and cables (ie, stay away from the tiny surface mount stuff)
Of course I am assuming here that you know how to solder in the first place.
If you don't you will probably have to take the unit in for repair.
Thank you very much for your quick reply. I will check what you suggested. I do know how to solder, I am an apprentice to become an electronics engineer, unfortunately TV's and such arent my field, and I'm still a rookie ;-)
I will reply by the end of the weekend and say if it worked.
//Mads
Not a problem. Remember, you may not be able to "see" a cold solder joint, but sometimes they'll stare you right in the face, and if you see a glaring one in the bunch, retouch it, and power up. If not, then go about as I previously said.
Alright, I got a little update already. I disassembled my TV and started resoldering all the joints on the components that might be stressed or looked like cold joints. I reassembled it and problem was still there. The I started poking around, to find out what exactly was affected when the color could come back on when bashing the TV on the back. I have now discovered that when I apply pressure to the Inverter board I get a normal picture. There are som big components I have never seen before, on the inverter board, rather big ones, square ones, which I tried to resolder, but that didnt do the trick. So the status now is, that when I apply pressure to the inverter board I get a normal picture. I havent found out why yet, so I would love it, if anyone have some ideas after this small update.
Ok, those big square things are little transformers (I'm assuming...I can't exactly see what you're looking at) but at this point I would be disconnecting any cables from that board or any board in it's area, and retouching the solder to all those connectors.
If course the "hack" solution (not recommended) is to stick some foam behind the inverter board so the casing applies pressure to the board, and keeps the picture up. I'd only recommend that if you were going to sell it to someone you REALLY dislike "AS-IS"! LOL
And I am going to further UN-recommend the foam thing, because I don't want anyone else reading this thread to think that's a great temporary fix, and then using too stiff or too thick a foam and then cracking the LCD when they put the case back together.
Alright so here's what happened :)
I resoldered the small transformers, and that didnt help, I tried tapping on them and that didnt help, but when when I applied pressure it helped. After further investigations it turned out that the pressure I was applying was working because it pushed in the backplate of the panel a tiny bit.
So the "defective" part is the panel, and I don't think I can fix that, as it's "inside" the panel, behind the metal plate.
I fixed the TV with a friends help, we folded some cardboard and have it wedged in between the panel and the backplate of the TV.
This is definitely not a perfekt solution, but since Sony doesn't sell of make the panel for my TV anymore, it's the only solution I got, without taking apart the whole panel ofc.
Thanks alot for your guidance supertech_11, it has helped me quite abit, if not as much in this case, then in future troubleshooting :-)
well, you basically implemented my foam/sponge fix only you used cardboard.
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Haha yeah.. true :P
I know it's bad, but as I said, It's kinda tough to fix ;)
3 years later and the cardboard fix still holds :P
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