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Sony bravia 40 inch LED and 3D smart tv Sony Bravia KDL40HX850 released april 2012.

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Vertical coloured lines and double image/picture

Hi all!

So, this is my grandma’s TV, it has gone bad overnight and she wanted to know if I could fix it. It’s at my place now, half disassembled, so if you’d like more info, just ask.

When the TV is cold (not being turned on for 24 hours or more) she gets vertical coloured lines appear, but they go away after a couple of minutes.

After that the picture is nice and crisp for 10/15 minutes

But after that it starts to display every picture/text double, like everthing is in 3D.

What I’ve tried so far;

I’ve ruled out a software issue I think (turned auto-3D off, updated FW and reset TV to factory defaults).

Looked for obvious defects on the boards (leaking or buldging caps, bad connections, etc.) but couldn’t find any.

Cleaned all the ribbon cables and every other connector with contact spray and reseated them.

But nothing seems to work.

What I’ve noticed;

The T-CON board (part nr 1p-111cx00-4010) has 2 chips (1 black one, looks like a RAM chip and 1 Silver big chip with Sony XCA 7 on it) who get really hot in just a matter of seconds, too hot to touch. I’ve actually burned the tip of my finger.

Is it normal for these components to get this hot?

I’ve highlighted the chips in the picture.

What could it be? Thanks!

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Hi @gh1994 ,

If the screen stays on long enough try the using the TV’s Self Diagnostic screen display feature as described in p16-17 of the service manual and check if there is anything there that may point to the problem.

To download the file, click on the I’m not a robot checkbox below the Document preview box and then on the Go to Download box.

When the sentence below the Document preview box changes from This file is downloadable free of charge (5/day): ...processing... to This file is downloadable free of charge (5/day): Download (sony kdl-40hx850 kdl-40hx853 kdl-40hx855 kdl-46hx850 kdl-46hx853 kdl-46hx855 kdl-55hx850 kdl-55hx853 kdl-55hx855 chassis az3f ver.3.0 segm.3a-g 305pages), click on Download as this is the link.

Be patient as it takes a little while to find the file.

Here’s an image taken from the file that shows what to do.

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(click on image to enlarge for better viewing)

Update (12/01/2019)

Hi @gh1994 ,

OK take 2.

Here’s the fault triage chart and the no picture troubleshooting flowchart.

The triage chart seems to favour the BAP board and the flowchart goes for the TCON board last as well after the B and G boards, as well as their harnesses, although it is mentioned as a possibility in the triage chart.

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(click on image to enlarge for better viewing)

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Hi! Thanks for your reply. I forgot to mention that I've already tried that. But as soon as I press "5" the TV turns on. So, it looks like I can't enter the diagnostic test.


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