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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Hello all!
This post will mostly just act as documentation for my undertaken troubleshooting steps for this TV. Advice will also be appreciated for things to try next
Picked up the TV in thread title from a retail returns auction, symptoms were as described. I started my troubleshooting attempts by shorting the 19V PSU rail to the 3v rail with my multimeter... Doh. Big spark, dead PSU, TV not turning on anymore. Picked up a new mainboard and PSU locally from someone here in Sydney, wasn't sure if my butterfingers had killed both and was a big drive to pick them... -
Just bought this for 10 bucks yesterday hoping to fix it. The guy said water dropped inside from a dehumidifier hose and it started showing black and white vertical bars then went blank. When I got it home and turned it on it came on fine and displayed correctly but I was noticing faint vertical bars in the image. After a little bit I turned it off and back on and it was a black screen again. I opened it up to check for water damage and corrosion but didn't find anything of the sort. I cleaned the ribbons anyway and reconnected them but still got a blank screen. If I disconnect the right side... -
Hi,
I have a VIZIO E70-E3.
Symptoms: Black screen, no picture, but LED backlights are working.
I probed the power board and voltages are as listed on the board.
Main board appears fine, too.
I believe the problem is either a bad T-CON board, or connection to LCD, or bad LCD.
There are two separate ribbon cables feeding the LCD.
If both are connected, the screen is black.
If only the ribbon cable that feeds the right side of the screen (when viewed from the front) is disconnected, the left side of the screen shows picture and... -
I got this tv yesterday and it shows a screen full of colored vertical bars and horizontal lines that move, change, and dance around. When the set is powered on there is a slight buzz from the tcon. I removed one ribbon at a time and this was the result:
Right side connected, left side disconnected = half image on right (somewhat distorted, see photo attached) white screen on left. NO buzzing from TCON
Left side connected, right side disconnected = right side black, left side white with distorted horizontal lines near top of screen. Buzzing from TCON
I swapped... -
Hi fellas, I have a Toshiba 50u6863db (vestel crap) here belonging to a family member.
The TV was given me to repair (possibly) as it had developed a blank screen, just back lights and sound.
Upon further investigation it turned out one of her cats had sprayed on the screen as I could see it on the edge of the panel and tabs and it stank. Looks like it probably shorted the circuitry. I cleaned it up and still the same.
I initially suspected Tcon board as none of the test points were showing correct voltages. Tried removing one LVDS cable at a time, same result....
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