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 no picture. The main chip on the tcon board is very hot that I can touch it for about 3 seconds. All voltages vin, vhg, vhl, vdd, vcom and the ladder resistor voltages are within normal range. The tc1 and tc2 voltages fluctuates from 8v to 30v. If I try to cover the ckv signals on ribbon eg. The right side one, it still comes on with the entire screen showing the logo with fine lines then attempts to update the software. If I apply 12v from my linear power supply, the tcon board draws around 240mA. Also if I disconnect both ribbons from the tcon, the main chip on it gets extremely hot and the Power ON light still gives the two blinks in quick succession. I'm trying to rule out if the panel or the tcon is the problem. Any help or advice would be greatly appreciated....regards.
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These have panel issues. Likely that's what you have. I've yet to find one with a TCON issue.. but I don't have huge volume like a TV repair shop. -
Your response is noted. Thank you. I will start over double checking the tcon board and more importantly looking at the panel board that the COF are connected using datasheets where possible. Will provide an update....cheersComment
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Also the power light blinking.. generally when you get a Roku TV and it's not connected to Internet it will continue to blink that way. Connect it and it'll stopComment
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Mine (TCL 55S425) has similar failure. One failure was TVS which got picture working pretty good other than some horizontal lines. Further tinkering probably caused more COF failure.
https://www.badcaps.net/forum/troubl...l-buffer-board
On a different TCL 55" model (55S405), I found 2 differnet panel+T-Con manufacturer despite same TV model. You might check your T-Con in case 43" had multiple panel t-con manufacturers.Comment
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Ok. Noted. Thank you for your response. Will provide an update as soon as I can....cheersComment
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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... -
Hi everyone!
I have a Sony KD-65A1 TV with a fault – 4 red LED blinks. After disassembly and visual inspection, I found that the G76 power board and DKA board had been replaced. It is also possible that TCON was replaced, but I am not sure – there are a few marker marks that could be factory-made.
Based on assumptions, the previous service attempted to solve the issue by replacing potentially faulty components. I decided to investigate further, found a service manual, and figured out a way to power up the power supply unit autonomously and put the OLED panel and... -
Well, I will be the first to admit that I screwed up...
In attempting to replace the backlight in a UN65TU8000, I made a hole through one of the ribbon cables between the board that runs along the bottom of the back of the TV and the panel. This lead to a between a 1/4 to 1/2 inch vertical stripe running the full height of the image.
I don't have the experience; personally, to solder a bridging wire for the paths that were cut. So, I have been on the hunt for other Samsung TV's of similar size.
I have 2 that I have found and have in my possession. ... -
This thread is about trying to get an Universal Main Board to work with a Sharp TCON and panel.
I have a Sharp LC-46D85UN TV that has had a main board issue. Since this model is from 2009, I am not able to find an exact replacement of the main board. Instead, I decided to see if I can future proof this tv by getting a Universal Main Board (T53U21.2) from China to work with the Sharp TCON (CPWBX4291TPZA) and panel. The universal main board supports a 8 bit dual channel LVDS interface whereas the TCON requires a 10 bit dual channel LVDS input. I have modded the LVDS connector to match... -
Hi,
i want to repair a Sony KD-75XF9005 TV that initially only showed a grey picture.
Backlight seems to work, Sound (Setup menu after reset) works.
If i dissconnect the left FFC cable from TCON to panel i have half a screen on the right. If left cable is connected always only the grey screen.
Interchanged the cables, its always only the right side that is working. Always grey if left side is connected.
With my small knowledge i would think at least the cables are good.
Can this happen because of a bad tcon board?
Or is it always a bad/shorted...
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