Sony 65xd9305 bad panel ?

[zomi]

Came to me with a dead dps
repair done

but have some lines on the screen

not the t con
have tried with another t con.

how do you do the tape cut off with 4 cables coming from the tcon

pics where u get white screen and lines is where one set of the tcon cables going to the lcd have been removed.

[zomi]

Re: Sony 65xd9305 bad panel ?

Is this case of these diodes starting to fail ?

[Biruslapio]

Re: Sony 65xd9305 bad panel ?

can you isolate which side is causing this?

[zomi]

Re: Sony 65xd9305 bad panel ?

on both sides unfortunately
not been able to isolate

[Davi.p]

Re: Sony 65xd9305 bad panel ?

To block the lines you must follow tcon serigraphs, clock markings especially, post a decent tcon picture, no flash only sun light

[zomi]

Re: Sony 65xd9305 bad panel ?

tcon
hope thats is clear enough

[Davi.p]

Re: Sony 65xd9305 bad panel ?

i don't find much on the component side, is there any test point on the under side?

[zomi]

Re: Sony 65xd9305 bad panel ?

been unwell, have pics of lcd board with test points

did you mean this board

[Biruslapio]

Re: Sony 65xd9305 bad panel ?

These should be the clock lines highlighted, use continuity test to track to which pins they lead from the t-con cable, then block them with tape, for utmost precision, you would remove the resistors one by one until you figure out which signal is causing this.

[zomi]

Re: Sony 65xd9305 bad panel ?

The clock lines don't trace back to the tcon..

I will double check again tomorrow, late and bad lighting

But i couldn't trace them back..
may have to just try removing the resistors and see that way maybe

[Biruslapio]

Re: Sony 65xd9305 bad panel ?

At least one side traces obviously to that ic next to them, I saw that but in all TVs I remember they came from the t-con instead, and it's easier and much less damaging to block the signal in the cable if possible.

For the other side it then must go into some other ic into the board.

[Davi.p]

Re: Sony 65xd9305 bad panel ?

This screen design is slight different from the others, i have understood how is, the clock signals in the low voltage versions (CPV1...2...) starts.from the tcon and arrive onto the distribution boards into the square chip or the other one, in this the clocks are level shifted towards the panel, it is possible some gate drivers gone bad but if i remember the photos there are not the most typical signs, there is a possibility the level shifter chip is bad, one of the two in the sides.. replacing this is a waste of time for me cause the only few.you.will find on the market are bad parts, i'm experiencing the same situation... to ensure this you must probe with.scope.or frequency meter the output clocks on the biruslapio photo, compare between them

[zomi]

Re: Sony 65xd9305 bad panel ?

The 2 ic
Added pictures