Sony KDL-55W900A

[larrymoore]

Here is a video of what my TV is doing https://www.youtube.com/watch?v=9aHWQ9j9ois

I've replaced both the power supply and T-con boards, but the problem stays the same, 5 red light blink error code. If I i disconnect the output ribbon cables from the t-con board, the tv will not fault.

I've inspected all of the ribbon cables around the panel and none of them appear damaged. I've never worked on a Sony, so I'm curious how the side panel cables work.

Do they use the frame as a ground? or are they just to test the panel in the factory?

[larrymoore]

Re: Sony KDL-55W900A

Please help

[budwich]

Re: Sony KDL-55W900A

Have you tried inputting a signal in? Those tabs cables appear to be carrying / transferring signal from one section to another. Are they on both sides or just one side. If you "feel" them while the tv is on, do any of them feel warmer than others? I suspect if you actually input a known signal / display, your problem will be easier to ascertain.

[larrymoore]

Re: Sony KDL-55W900A

Yes, the tabs with the driver chips are on both sides of the display. One is hotter than the rest. I just ordered http://www.amazon.com/ARCTIC-Thermal.../dp/B00UYTTLI4 to install so that I can sink the heat onto the aluminum bezel. I'm hoping that it is a loose connection and not an actual chip or tab ribbon failure.

Of course if it is internally shorted, there isn't a lot that can be done, although
I have read that there is an option of removing a single driver and the display can still work.

[budwich]

Re: Sony KDL-55W900A

"I have read that there is an option of removing a single driver and the display can still work."

Interesting, where did you read this? We (the forum) have found that certain sharp (visio and sony) at 70in have tabs down each side. On certain tab "failures" associated with one side, they are totally removed down that side and the set functions "well" there after. I don't think anyone has seen this "same result" from others / lesser side designs, hence the question.

Back on your problem, if you disconnect the tcon cable(s) associated with that side of the set, does anything change ... again, good input will help with the diagnosis as looking at a blank screen / snow isn't very useful (even a menu has limited use if the menu is "sided").

see this as an example.
https://www.badcaps.net/forum/showthread.php?t=49281

[larrymoore]

Re: Sony KDL-55W900A

I believe it was this thread that talked about it.

http://www.avsforum.com/forum/166-lc...ab-repair.html

also some good information here

http://www.electronica-pt.com/images...ing_manual.pdf

[budwich]

Re: Sony KDL-55W900A

ok.... but I think that those are looking at "replacing" while the sets the forum looked at was removing. Certainly interesting, as I don't know of many that have tried a tab replacement... of course, finding a replacement tab might be a problem for most.

[larrymoore]

Re: Sony KDL-55W900A

I figure that I will have to find one harvested from a broken panel.

I really hope that I don't have to go that far; that the thermal pad will keep the driver chip cool enough to solve the problem.