LG LGP65C2-220P Bitten by a cat!

[dkneyle]

I have been passed this OLED TV which has an interesting story. The owner's cat was seen to bite the edge of the panel at which time the TV shut down and won't restart.

I can see no physical damage to the panel. I don't know OLED technology, but I'm assuming that the cat's bite caused some elements in the panel to come together, which normally should never come into contact? The bite would be on the edge of the panel where the connections are.

I've tested the power supply. When the Power On button is pressed it flashes off then back to red state. The Power On line comes up to 3.3 volts steady. The big main caps appears to cycle quickly between full volts then back to zero about every second. All fuses check out OK. No 20 volt supplies come up. Standby supplies appear OK.

Just looking for best guesses as to where to start? Do you reckon it's a power supply fault?

[EazyBone]

I've seen videos of cats biting screens and they break. Take a flashlight to the area of the break and look at different angles for small crack.

Not sure how you get the idea it's a power supply when the owner said it was damaged by the bite.. I guess hopeful thinking to restore a TV 😜

But maybe those videos are just AI and it was unusual timing

[dkneyle]

I'll look very closely again. I assume if the oled panel is damaged then the self check routine identifies that and won't start the power supply?

[Davi.p]

If the panel has got the same COG technique like LCD then a crack in the very border can damage those circuits and all thing you can do is to try the same old method of signals masking..

[Diah]

did the owner deliver the cat with this TV LOL. to check her teeth power ..

disconnect the lower LVDS between main boards and T-CON driver boards... if the TV remain on and the Optic Audio port lit red on MB and remain on then this cat damaged the Panel.

[dkneyle]

did the owner deliver the cat with this TV LOL. to check her teeth power ..

disconnect the lower LVDS between main boards and T-CON driver boards... if the TV remain on and the Optic Audio port lit red on MB and remain on then this cat damaged the Panel.

Thanks for that good advice. I'll try and advise outcome.

[dkneyle]

did the owner deliver the cat with this TV LOL. to check her teeth power ..

disconnect the lower LVDS between main boards and T-CON driver boards... if the TV remain on and the Optic Audio port lit red on MB and remain on then this cat damaged the Panel.

Yes, disconnected those two LVDS and the power supply came to life. The Optic Audio port didn't actually light up, but I had 20V output and everything you'd expect from a working power supply. Upon very close inspection I found a crack in the plastic front cover, about 5cm long, not far from the edge of the frame. I'm pretty sure that the point of disaster. I've advised the owner it's a write off, and I'll salvage the good boards. Do you reckon the T-Con would be damaged or OK?

[Davi.p]

you don't even try the maskinh tape method? search the forum in lcd tv threads

[Diah]

Yes, disconnected those two LVDS and the power supply came to life. The Optic Audio port didn't actually light up, but I had 20V output and everything you'd expect from a working power supply. Upon very close inspection I found a crack in the plastic front cover, about 5cm long, not far from the edge of the frame. I'm pretty sure that the point of disaster. I've advised the owner it's a write off, and I'll salvage the good boards. Do you reckon the T-Con would be damaged or OK?

you dont need both LVDS, only the lower one 51 Pin disconnected.
BTW if the Bite was at the courner then EVDD got short... so you can disconnect the EVDD socket which come from PSU to t-con... its 20-24V

[Diah]

T-CON are fine, because it send SOS signal via 51PINs LVDS so the MICOM on MB turn off the PSU