philips plasma tv repaired y-sus no blotchy picture.

[joey]

hi guys have a philips plasma tv. tv had no picture after some checks the tv had a blown top buffer and y-sus.

i repaired the y-sus and replaced both upper and lower buffers.

the tv now powers up with a scrambled colored blotchy picture?

heres a video showing problem.
http://youtu.be/cBkHHADAwfM

does anyone have any ideas what might be the problem.

[tom66]

Re: philips plasma tv repaired y-sus no blotchy picture.

A few possibilities:
- incorrectly seated connector LVDS from main board to control board
- bad -Vy or Vsc (check with test points)
- low Va voltage (low Vs would cause dimmer picture usually; Va is used to address the screen so if it goes bad picture might go bad like that too, but I'm not certain.)

[joey]

Re: philips plasma tv repaired y-sus no blotchy picture.

thanks tom. lds connector is fine as i reseated it Vsc and va voltages are correct.

[tom66]

Re: philips plasma tv repaired y-sus no blotchy picture.

-Vy?

[joey]

Re: philips plasma tv repaired y-sus no blotchy picture.

all voltages seem fine i even adjusted each slightly and picture adjusted slightly but colored blotched patterns still present.

[tom66]

Re: philips plasma tv repaired y-sus no blotchy picture.

all voltages seem fine i even adjusted each slightly and picture adjusted slightly but colored blotched patterns still present.

Is the cable from Y-sus to X boards seated properly? It could be an X buffer or a Y buffer problem. Were the Y buffers new parts?

[joey]

Re: philips plasma tv repaired y-sus no blotchy picture.

yes checked the cable from y to x each go into control board reseated and its fine. both the upper and lower y buffers are new parts.

[tom66]

Re: philips plasma tv repaired y-sus no blotchy picture.

yes checked the cable from y to x each go into control board reseated and its fine. both the upper and lower y buffers are new parts.

I'm not sure; at this point I would be suspecting the control board or that you didn't actually get new parts (and the seller was lying.)

[joey]

Re: philips plasma tv repaired y-sus no blotchy picture.

thanks tom. guess i will just sell it on for parts as i dont want to spend any more on this tv as i have 2 to repair.

regarding other fault on other plasma tv it all works but has a thick black bar across top of screen do you think this is a panel fault or just a simple buffer fault.

i know panel driver faults can cause vertical lines or thick bars but pretty sure not lines across.

i have attached a picture.

[tom66]

Re: philips plasma tv repaired y-sus no blotchy picture.

thanks tom. guess i will just sell it on for parts as i dont want to spend any more on this tv as i have 2 to repair.

regarding other fault on other plasma tv it all works but has a thick black bar across top of screen do you think this is a panel fault or just a simple buffer fault.

i know panel driver faults can cause vertical lines or thick bars but pretty sure not lines across.

i have attached a picture.

Y buffer almost certainly.

[cadiman]

Re: philips plasma tv repaired y-sus no blotchy picture.

vertical lines are almost always bad.

lines/ bars across the screen are almost always at the buffer board.

The buffer board ribbon cables are very hard to seat properly and could be your problem if it had been apart before. (Check that first with tv off))

The ribbon could have been damaged as well.

A failed buffer ic will sometimes put the tv into protect mode and sometimes just not work with tv staying on pending panel model and type of chip failure.

The repair may be as simple as replacing the upper buffer board.