sony KDL-50W808c audio ok but no video

[ccaguest]

Hi friends,
i'm struggling with sony KDL-50W808c with , but no dark screen.
If i unplug the right lvds cable form t con ( i have 2 lvds from t con to panel )half screen is ok.
As soon as i connect back the right lvds, i realized that all tcon voltage voltage in the way of panel goes to 0 and then dark screen.
i have changed the tcon with same result.
Tcon is auo T550HVN08.2.
I would like to check for short on the card that distribuite voltage from lvds to cof flat , i but know where to measure .
Any help or drawings or idea will be really apprettiate

[nomoresonys]

Re: sony KDL-50W808c audio ok but no video

Check those little caps there, TV UNPLUGGED from power, ohm mode, probably looking for shorted or very low ohm could be a problem.

[ccaguest]

Re: sony KDL-50W808c audio ok but no video

Tkx for reply,i checked and removed several suspicious caps ( low resistance vs gnd ) but none helps.looks like same common tracks drain to ground .

[budm]

Re: sony KDL-50W808c audio ok but no video

https://www.badcaps.net/forum/attach...7&d=1567854486
So you check the cap on that tab bonding and found some low Ohm readings on some the cap? Then if you check the resistance of the empty pads where the caps are connected to, does it still show low resistance? It may be that the COF may be bad.

[ccaguest]

Re: sony KDL-50W808c audio ok but no video

Well, i have 3 cof in the rx part of the screen.i cant say that low resistenze is evident close to one specific cof tab. would say not full short.
I eould try to go with power supply to check for short.but i dont know were to go with the power.schematic would help.