What is killing my tcon board?!?
Symptom: vertical colored bands on display
Power supply- all listed voltages to master, slave, and main are present and steady.
I skipped a few voltage tests on this repair as ive seen this before. i immediately was trying to determine if it was display vs tcon. unplug tcon, vertical bands dissapeared immediately and the tv was fine. Replaced tcon board and the tv would turn on and shut itself down. while trying to read cycling voltages on main board and tcon, about the 5th cycle, the vertical bands are back and again, dissapear when i unplug the lvds to tcon.
My interpretation of this is that something blew the tcon. i am ordering a new board again and this time will check components from the known good vs the 2 that are “blown”. just trying to get thoughts on where i should be looking.
The tcon board is an auo brand t420hw01 v2 / 07a33-1b, but i think its something blowing the board so perhaps a clue on what would be blown on this board may help.
The main board is eax42405502 (10) - im thinking this may be the culprit, but am unsure what to check to see if it is allowing over current to tcon. (need schematic or expertise)
The driver boards im thinking are good,as the backlight is lit and it is not connected to the tcon in any fashion.
If it was the lcd display, the lines would still be present regardless of the tcon i suppose. if it is a voltage issue blowing the tcon, the display is just a feedback loop through tcon to main board as opposed to the main board being the output to the tcon. is my thinking in the ball park on this?
any help, thoughts, proper voltages lol would be greatly appreciated.
So this image is from the new board ordered, after power cycling a few times while getting readings. it would turn on and then shut itself down. like the original board, now the tv stays powered on with the lines. once i disconnect the tcon, the lines disappear and the tv stays powered on with backlight. Off of what you had posted in your reply @oldturkey03 , it appears that the driver boards are connected to the powerboard and the lcd panel. the tcon board is connected to the lcd panel and the main board. if the driver boards and tcon are connected on this unit, it is internal and through the lcd it appears. it looks weird haha. but to trouble shoot the driver boards, i have disconnected each side of the lcd boards one at a time and the the tv will go through post and shut down.