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Discussion Starter · #1 ·
I can't see to find anyone who even has ever seen or heard of this problem on the web or with local techs. My Bravia xbr 4 is about 18 months old and now it flickers and sometimes get stuck like in the photo. Sometimes it only last a second, sometimes a couple of minutes or even longer. Sometimes it may go a whole day and not do it. Very random, has anyone seen or heard of this issue? Know what it could be, I'm trying to figure out if its worth trying to fix or just buy a new one.

 

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Quote:
Originally Posted by spxChrome /forum/post/17000800


I can't see to find anyone who even has ever seen or heard of this problem on the web or with local techs. My Bravia xbr 4 is about 18 months old and now it flickers and sometimes get stuck like in the photo. Sometimes it only last a second, sometimes a couple of minutes or even longer. Sometimes it may go a whole day and not do it. Very random, has anyone seen or heard of this issue? Know what it could be, I'm trying to figure out if its worth trying to fix or just buy a new one.


It seems that LCD drive (pixel driver) board does not provide contrast control - it "pushes" to max. the drive “bias” voltage that polarises LCD crystals. These crystals then allow all available backlight to pass thru.


I would clean all ribbon cable contacts first between pixel driver board and LCD screen. If still the same... replacing the PCB may solve the problem


Pixel driver boards can be found on e-bay for next-to-nothing (around $100)…


Boky
 

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They are not generic. And if that don't fix it, you may need to replace the whole panel and/or the "main" board.
 

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Quote:
Originally Posted by spxChrome /forum/post/17004952


Does the pixel driver board have to be specific to this tv or even model or are they pretty generic?

The pixel driver board is located in the middle (at the back) very close to the bottom edge, and is connected to LCD panel (usually) via two wide, flat ribbon cables. The part number is clearly written on the PCB.

Do not remove the back cover if you don't know how to deal with lethal high voltages!!!!!

You've been warned!!!!


However, if you have sufficient experience, replacing this board can be done really quickly at a very low cost....


Otherwise, leave it to service guys….


Boky
 

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Quote:
Originally Posted by Extreme_Boky /forum/post/17007728


The pixel driver board is located in the middle (at the back) very close to the bottom edge...

Bottom edge? Every LCD I've seen has the Tcon board on the TOP edge.
 

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Quote:
Originally Posted by Extreme_Boky /forum/post/17012103


.if you turn the panel upside down to make it easier to work on?


Boky

Ya, I prefer to stand on my head when working on Tv's, gets the blood flowing to the brain
 

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Discussion Starter · #9 ·

Quote:
Originally Posted by Extreme_Boky /forum/post/17007728


The pixel driver board is located in the middle (at the back) very close to the bottom edge, and is connected to LCD panel (usually) via two wide, flat ribbon cables. The part number is clearly written on the PCB.

Do not remove the back cover if you don't know how to deal with lethal high voltages!!!!!

You've been warned!!!!


However, if you have sufficient experience, replacing this board can be done really quickly at a very low cost....


Otherwise, leave it to service guys.


Boky


Thats only if I leave the TV plugged in right? Or can I still make my hair stand up if its unplugged and I starting ripping out cables?
 

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Quote:
Originally Posted by spxChrome /forum/post/17033173


Thats only if I leave the TV plugged in right? Or can I still make my hair stand up if its unplugged and I starting ripping out cables?

Leave it unplugged from the wall mains outlet socket for couple of days and you should be okay. The sheer fact you asked the question (above) is telling me you should probably leave repair to service technician but I may be wrong(?)


Boky
 

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Discussion Starter · #12 ·
Yea, I have to try and fix it myself. I don't know squat about it but the TV repair shop wanted $380 just to tell me what was wrong with and then $$$ for whatever it cost to fix. So that is why I am here, hopefully it is the board and between this board and I maybe I can get my TV back from the dead.
 

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Quote:
Originally Posted by spxChrome /forum/post/17063455


"Pixel driver boards" is not returning many results. Is it called something else?

Normally called TCON board. But Sony calls it the UB1 board (at least on kdl52xbr4):
$155 rebuilt
$390 new
 

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Hi. I have a KDL-52XBR4 which shows a white screen (washed out image with streaks following any text) on the entire LCD when it is powered up. The entire screen is white and pictures in the background are visible as if you were looking at a negative. The sound is intact. It is the same problem as the Original Poster.


Removed power cord for more then a minute - plug back in - no good.


This is happening on all the HDMI, and component inputs.


I unfortunately didn't buy the extended warranty from Circuit City when I bought the TV in Jan 2008.


Can someone suggest where I can find the service manual for this TV ?


Below are the picture that shows the exact symptoms - that are uploaded by some one else who had the exact same problem on his 52XBR4 and his problem started just a month before mine.

http://www.avsforum.com/avs-vb/attac...5&d=1262935361

http://www.avsforum.com/avs-vb/attac...6&d=1262935361


Called e-support - did basic reset of TV and unplugging of power cord to see the results - still no good. Also I was suggested to call the local sony technician to have a look at it and get the report break down and call back with that report. Per the tech he said this is video module issue and he is not sure whether the video module is available separately or part of a panel. He will let me know today after finding that out by calling sony engineers. He did pretty much nothing but went through different menu options and within 2 mins said that it could be video module issue. I have to pay him 95 bucks for his 2 mins visit at my place.


Any suggestions or can I do further diagnostics by myself? Any ideas or clues are welcome.


Thank you

Vikas Patel.
 

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Quote:
Originally Posted by hammerdwn /forum/post/17064199


Normally called TCON board. But Sony calls it the UB1 board (at least on kdl52xbr4):
$155 rebuilt
$390 new

The UB1 board is the frame doubling circuit. It has nothing to do with the TCON board which is a different circuit. What I see in the photo at the beginning of this post is a problem with the FB board.
 

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Display Veteran - are you suggesting after looking at the photo at the beginning of this post (original poster) - that the problem is with UB1 board (meaning issue with frame doubling circuit)?


corrado85 - 52XBR 4/5 series are under warranty that has different issue and that too for 18 months from the purchase date. See link below that has differnet issue (lines stays on panel after turning the TV OFF).
http://esupport.sony.com/US/perl/new...R4&news_id=276

Or did I miss interpret your suggestion?
 

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Quick Update - Sony Service repair tech came to my house - looked at the TV menus to find out some thing where he can do test - didn't find what he was looking for.


Stayed for just 5 mins hardly - and played with the menu all the time - said that he will have to check with sony engineers and will call me and update me with potential issue and it's solution.


Called Tech next day afternoon - and this is what he has to say -


70% chances - UB1 board is faulty and needs replacement - charges breakdown -

PARTS - 225.00

LABOR - 450.00

TAX - 47.25


Total 722.25.


If that does not help - then it could be the TCON board which is part of a panel - part itself would cost 3000.00 plus labor.


Faxed the breakdown to sony - waiting for their call with potential options.


Can some one please confirm that it is UB1 board that is causing this issue?

Can I replace the UB1 board by myself? Where can I find the intruction to replace the UB1 board?


Any help is highly appreciated.


Thank you
 

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Quote:
Originally Posted by networm /forum/post/18107354


Display Veteran - are you suggesting after looking at the photo at the beginning of this post (original poster) - that the problem is with UB1 board (meaning issue with frame doubling circuit)?


corrado85 - 52XBR 4/5 series are under warranty that has different issue and that too for 18 months from the purchase date. See link below that has differnet issue (lines stays on panel after turning the TV OFF).
http://esupport.sony.com/US/perl/new...R4&news_id=276

Or did I miss interpret your suggestion?

All that happens on the UB1 board is taking the 60HZ video from the FB1 and doubling it to 120HZ for the TCON board. The UB1 board has been rather robust on this model and the few failures I have seen showed up as no video or a bunch of jumbled vertical lines.


The picture at the beginning of this post involves a problem with the entire screen. All video processing on the FB1 board is performed on a frame-by-frame basis at 10-bit RGB processing. It is remotely possible for this to happen on the UB1 board but I would go for the FB1 first.
 
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