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Old 01-19-2022, 11:20 AM   #1
Megan0
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Default Sharp LC-70UD1U Half screen Normal half screen is white

My Sharp LC-70UD1U Screen is black and flashing, "I attached the video"

Well, I opened the back cover and as you can see in the picture, I unplugged 2 L (left) ribbon, TV turned ON, but half of screen (Right) is normal, and the other side (Left) is white. I continued to test...
Result:
I swapped the ribbons L<-->R = Blinking 2x power light, 5x timer light
Unplugged 2 R Plug 2 L = Blinking 2x power light, 5x timer light
Unplugged 2 L Plug 2 R = Blinking 2x power light, 5x timer light

Only in the first test, where I did not change the ribbons, when I unplugged 2 ribbons on the left, half of the image is normal, and the other side (unplugged side) is white.

Does anyone have any solution?


https://youtu.be/JOXMDMceFhU

https://flic.kr/p/2mXXbTH

https://flic.kr/p/2mXWEQ9
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Old 01-19-2022, 11:46 AM   #2
DXseekerMO
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

Quote:
Originally Posted by Megan0 View Post
My Sharp LC-70UD1U Screen is black and flashing, "I attached the video"

Well, I opened the back cover and as you can see in the picture, I unplugged 2 L (left) ribbon, TV turned ON, but half of screen (Right) is normal, and the other side (Left) is white. I continued to test...
Result:
I swapped the ribbons L<-->R = Blinking 2x power light, 5x timer light
Unplugged 2 R Plug 2 L = Blinking 2x power light, 5x timer light
Unplugged 2 L Plug 2 R = Blinking 2x power light, 5x timer light

Only in the first test, where I did not change the ribbons, when I unplugged 2 ribbons on the left, half of the image is normal, and the other side (unplugged side) is white.

Does anyone have any solution?


https://youtu.be/JOXMDMceFhU

https://flic.kr/p/2mXXbTH

https://flic.kr/p/2mXWEQ9
Usually when we see this we find there are burnt/overheated gate driver ICs on one side of the screen. If by "right" and "left" side you are referring to right and left when looking at the back side of the TV it appears the problem side is upon the right, as in when the right side FFC's are attached and the left side isn't the TV goes in to protection mode and displays the "2-5" error code, but when the left side FFCs are attached a picture appears on that side and the right side is white?

EDIT/ADD: Look at the terminals on both sides of the FFCS where they plug in to the timing control board and the source driver boards. Are any of the terminals crossed, or have any of them lifted from the substrate?
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Last edited by DXseekerMO; 01-19-2022 at 11:50 AM..
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Old 01-19-2022, 04:29 PM   #3
Megan0
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

Quote:
Originally Posted by DXseekerMO View Post
Usually when we see this we find there are burnt/overheated gate driver ICs on one side of the screen. If by "right" and "left" side you are referring to right and left when looking at the back side of the TV it appears the problem side is upon the right, as in when the right side FFC's are attached and the left side isn't the TV goes in to protection mode and displays the "2-5" error code, but when the left side FFCs are attached a picture appears on that side and the right side is white?

EDIT/ADD: Look at the terminals on both sides of the FFCS where they plug in to the timing control board and the source driver boards. Are any of the terminals crossed, or have any of them lifted from the substrate?
Yes, When I attached the [R Ribbons] R side of the screen is normal, but if connect [L Ribbons] it goes to "2-5" error code. even I just attached [L ribbons] alone but it goes to "2-5" error code.

I checked all of the connector I think these are fine.

Last edited by Megan0; 01-19-2022 at 04:38 PM..
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Old 01-19-2022, 04:38 PM   #4
Megan0
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

Update: I swapped two Flex cables from white side to normal side, and I realized one one the cable has issue, when I attached the screen wasn't normal, screen was like horizontal colorful lines.

I don't know what I should to do, could it be from Tcon board or flex cable? or something else?
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Old 01-19-2022, 07:10 PM   #5
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

Inspect the lvds cable to the tcon and ribbon cable ends going into tcon, make sure there's no damage to the contacts. Make sure they are inserted perfectly even and lined up, can clean them gently with iso alcohol and a qtip. If still no joy, I would try the "tape-cutoff" method, plenty of threads here about it, mostly you block 3 or 4 signals on the end of the ribbon cable going to tcon on bad side of panel with tape.
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Old 01-19-2022, 07:14 PM   #6
nomoresonys
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

If you have easy access to the long buffer board between tcon and panel, you could check the little ceramic capacitors for shorts or very low ohms, I would expect them to be over 100 ohms.
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Old 01-19-2022, 08:18 PM   #7
Megan0
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

Quote:
Originally Posted by nomoresonys View Post
If you have easy access to the long buffer board between tcon and panel, you could check the little ceramic capacitors for shorts or very low ohms, I would expect them to be over 100 ohms.
I will, I found the broken flex cable, but I think it's a little bit tricky and need experience to fix it with "tape-cutoff" method.
for second test could you tell me which capacitor I should check with ohmmeter.


https://flic.kr/p/2mYaSsp


https://flic.kr/p/2mY4ec7
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Old 01-20-2022, 07:54 PM   #8
nomoresonys
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

Tape method there, he goes into some detail but it's usually just cover 3 or 4 lines on one end or the other: https://www.youtube.com/watch?v=tCknTVbZ3I8
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Old 01-20-2022, 08:11 PM   #9
nomoresonys
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Default Re: Sharp LC-70UD1U Half screen Normal half screen is white

Checking caps there, plenty more videos about it on youtube also: https://www.youtube.com/watch?v=jLd6QO7Z7m4
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