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Repair information for the Sony Bravia 42" LCD TV. Released in 2012. Model number: KDL42EX440.

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Thin black horizontal lines across TV: Sony KDL 42W706B.

Hello everyone,


I need help with my Sony KDL 42W706B television. This morning the TV was working perfectly fine and at some point think horizontal lines appeared starting from the bottom left and going half way up the screen. In certain conditions it’s hard to spot but in others it’s very noticeable. Been doing some research and it’s not clear what the issue might be. Tried to take some pictures to highlight the issue but they are a little difficult to spot the fault. I did attempt to see if I could take off the back panel and see if anything was amiss but it wouldn’t budge once I removed all screws and I didn’t want to force it off doing damage to anything.

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Added two pictures of the back panel like I was asked. Though according to what I’ve read there doesn’t seem to be any point in trying to fix this if I could get into it anyway. Frustratingly I can’t afford a new or used TV to replace it right now.

If anyone as any knowledge on what I might be able to do or if I’m screwed at this point I’d appreciate the help as I’m finding it hard to get solid information.

Appreciate the help.

UPDATE: The screen as gone black entirely now. Still starts up with the backlight working but there is nothing displayed on the screen and I tried the flashlight test but couldn’t see anything. Please help!

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Macho Fantastico did you replace all the screws again when you took the picture? I believe this is a model where you have to remove the stand as well

par

I found a way to remove the back panel. Basically it needed more force to remove from it's clips and I've had it off checking over everything. Disconnected/reconnected cables including the ribbon cable going into the main board but the issue still remains. The more research I do the more I suspect it's possibly to do with the the side connections (failed Gate Drivers I think they might be called) but I'm not sure how to gain access to them easily. I've looked for guides etc but had no luck so far. Seen videos of people with similar issues who've put slight pressure on those connections which fixes some issues and considering I don't have many options I thought it was worth a try. I've been asking about but you're the only one whose really provided any real advice, it's much appreciate especially considering I can't really afford a new TV at the moment.

As for the stands, no you can take the back panel off without removing the stand. Thanks again.

par

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Macho Fantastico  those are the lines I hate the most. It is usually an indication that your LCD driver board is/has failed. Either the bonded connection from that board to the LCD or on the LCD itself. The LCD driver board is bonded via very fine ribbon cables and cannot be replaced by us DIY’er due to the bonding required.

As for the rear cover removal, post some good pictures of it with your QUESTION. That way we can see what you see and possibly figure out why it is still stuck.

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I've added two photos of the back panel. I have seen a video with someone taking it off easily but he doesn't show how. Thanks for the advice.

I have also noted that in the bottom left corner the brightness changes slightly, almost like a flickering of is going on. Not sure if that is any indication of anything.

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@Macho Fantastico this "(failed Gate Drivers I think they might be called) but I'm not sure how to gain access to them easily" is correct and there is no easy access to it. Follow the small ribbon cables that are connected directly to your LCD. The board that those ribbon cables are connected to is the driver board. That is where the Gate and Source drivers (IC's) are connected to.

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@oldturkey03 Unfortunately things got worse. Last night the screen went dark on me and whilst sound still works (me going through the menus etc), there is no picture whatsoever. Had to open it up to see if any cables had come lose but no, everything seems fine and I'm not sure what the problem is. The Sony logo doesn't even show up now. Any ideas?

Thanks again oldturkey03. Appreciate it.

par

@Macho Fantastico post some good pictures of all your boards with your QUESTION. Lets see what we can find

par

@oldturkey03 Will do, will take some pictures tomorrow. Thanks again.

par

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Macho Fantastico sera éternellement reconnaissant.
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