I picked a LG 55lm6400 that has vertical lines on the right side of screen. Will get pictures up shortly. The tv powers on automatically once plugged in and there is no picture,menu nothing. Just prelit screen with 4 vertical lines on right side. The standby light is always on, does not respond to remote or power button on tv. I can unhook the lvds cable on the y drive boards, and then there is no lines on the screen anymore on either side with right or left lvds unhooked. What's the chances the main is bad?
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Re: LG 55lm6400 Bad panel or main?
Here is a picture.Attached Files -
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Re: LG 55lm6400 Bad panel or main?
No response from buttons or remote sounds like a mainboard problem. Try reseating all of the LVDS cables first. If that does not change anything then main is suspect.Comment
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Re: LG 55lm6400 Bad panel or main?
Already cleaned/reseated lvds few times no change. I'm thinking main also just wanted a second opinion.Comment
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Re: LG 55lm6400 Bad panel or main?
UPDATE! Found a lg 47lm series with busted panel local. Bought just the main, TV is back up and running perfect.
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Re: LG 55lm6400 Bad panel or main?
Very surprised... panel was OK? Nice fix. Maybe I'm too cynical but I would have called panel any day.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
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Hello all ~
Hope this finds you well. This LG 82UN8570AUD (April 2021 model) 4K UHD television has full audio capabilities but video is compromised / problematic.
When I picked up this large LG tv it had a full black screen upon startup. Previous owner said it just went black one day. No popping sound or anything else of note.
I got the display to work by taping off several traces of the right-hand side ribbon cable on the TCON that leads from TCON to PANEL. However, despite dozens and dozens of attempts to find the right combination / range of traces taped... -
Good day, I have a TCL TV: Model 43s423. After turning ON the TV, the ROKU TV logo appears with fine lines over the whole screen, then after a while there are vertical bands in the middle of the screen top to bottom and the TV tries to update its firmware but I do not have the remote to connect it to my new network connection. Also the Power ON light blinks 2 times in quick succession. When I remove the ribbon on the right of the tcon board the left side of the screen shows but with fine lines. If I remove the left side ribbon and connect the right side ribbon the whole screen is blank with... -
TV flashes backlight then reboots over and over. no image. Client said it used to have image for a bit before rebooting. Got worse over time.
tcon is built into mainboard.
Only one cable goes to panel boards.
there is a cable from one panel board to the other that links them.
cost cutting measure that results in us having harder time to diagnose.
removing the link to the second panel board allows TV to stay on with stable backlight but no image.
used cut off tape method to mask 1 maybe 2 pins on the side of the cable that goes to that second panel board....
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