Sony LCD TV image issue

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Sony KDL-55ex720

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Rusty @rusty4941

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投稿日: 2024年3月7日

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Sony LCD TV image issue

Hi all. I have a Sony KDL-55EX720. While watching tv last night the screen suddenly had like a screenshot of the show over the top. What we were watching was still visible over 100% of the screen, it just had an overlay, kind of like burn-in. The overlay image wasn’t full color, it was almost white. I switched the input to another hdmi channel that didn’t have anything connected so that it was all black. The overlay was still there but it gradually started turning black. Maybe took 5min for the screen to go completely black. Once the whole screen changed to black, I switched back to the original hdmi channel (with picture) and it was back to normal. But after less than a minute, you could see the brighter vertical lines creeping back until it would cover almost 3/4 off the screen from right to left. You could still see the full show, just with a patch of brightness over the top. It didn’t like like a screenshot anymore, just bright white. And I could repeat the process of going to a black screen and it channeling black etc. Any thoughts what it might be? T-CON?

Thanks

This is with no input.

Photos of boards.

Before testing T-con ribbons.

Round 1

Left

Right

Round 2

Left

Right

T-con close up

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10 件のコメント:

@rusty4941 Can you upload some pictures and/or videos of the problem? iFixitでの質問に画像を追加する方法

Andrew S さんによる2024年3月8日

@andrewsawesome Is that one enough to go off?

Rusty さんによる2024年3月8日

@andrewsawesome Any ideas? Do you need more info? Any tests I should do to confirm if it’s the screen or not?

Rusty さんによる2024年3月12日

@rusty4941 It's probably either the T-Con or the main board. I would order both.

Andrew S さんによる2024年3月13日

@oldturkey03 Thanks for the response. I’ve posted some extra photos. I’m ready to test whatever you need me to. Thanks.

Rusty さんによる2024年3月16日

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@rusty4941 Can you upload some pictures and/or videos of the problem? iFixitでの質問に画像を追加する方法 — Andrew S
@andrewsawesome Any ideas? Do you need more info? Any tests I should do to confirm if it’s the screen or not? — Rusty
@rusty4941 It's probably either the T-Con or the main board. I would order both. — Andrew S
@oldturkey03 Thanks for the response. I’ve posted some extra photos. I’m ready to test whatever you need me to. Thanks. — Rusty

oldturkey03 @oldturkey03 評価: 782.5千 1.1千 893 2.3千 · Answer 1 · 2024-03-13T19:08:49-07:00

@rusty4941 before replacing any boards, let us take a look at the ones you have in your TV. Hardest part will be to take it off the wall :-). then remove the back cover. Now, take a look at the boards and the interconnect cables. Take a couple of pictures of all of your boards cables etc. and post those with your Question. That way we can see what you see. Then check the individual ribbon cables for any tears, corrosion or anything unusual. Reconnect them and make sure they are properly seated.

Now, since we can't see your boards, I make the assumption that there are two ribbon cables that go to the LCD panel. Those should connect to the driver boards. Your TV may have a T-con board or it may have the T-con board integrated on the main board.

Disconnect the power from your TV. Disconnect one of those ribbon cables at the LCD driver boards. Then reconnect the power and turn the TV on. The side that you disconnected should be black but tell us what the other side showed. Now do the opposite side. Disconnect the power from your TV, reconnect the first ribbon cable disconnect the second ribbon cable. Plug your power cord back in and turn your TV on. Let us know what the outcome of those two tests was.

What I do not like are the three wider areas of failure (both ends and the one in the left half of the screen) but we shall see :-) This "switched back to the original hdmi channel (with picture) and it was back to normal." would be unusual for a T-con board failure but we can hopefully identify the voltage regulators on your board and try to determine if those have failed. You'll need a couple of hand tools and a volt/multimeter

@rusty4941 thank you for those pictures. can you do one more? Take a well focused close up of the EDL-4LV0.3 board. That is your T-con board. I want to see if I can identify the most common circuits that we could have you check. Looks like there was a thermal pad on the IC. Did this just come off while you worked on it? One of the things I always consider is a can of freeze spray. Turn the TV on and then "blast" the IC's with some freeze spray. See if that changes the image. Do the same on the main board. That is teh largest board, teh one with the video input connectors. The board just below the T-con board appears to be the LED driver board. If so, you wont need to blast that. Your backlights are definitely working. Heat is the enemy of circuit boards :-)

Sony KDL-55ex720

Sony LCD TV image issue

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Update (03/16/24)

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