Chosen Solution
Yesterday i saw black horizontal lines in the screen, today i checked in the internet for repair it maybe just to adjust lcd ribbons, i disassembled all the tv and checking black lines didn’t disappear. Then i thought to assembly all again, and when finished tv doesn’t turn on. (no led indicator, neither blink, nothing) When I plug the power cord to socket with all connected, tv does not go on.
If I disconnect the cord from the motherboard, at least screen white backlight works (i can see it through the screw holes
If I disconnect the cord from the power supply board , tv does not go on.
I haven’t a tester now here and can’t go for one because of the quarantine…so anyone knows what can I do? All connections, connectors, transistors, fuses, circuits, capacitors, etc. are in apparent good condition. When its plugged I hear a continuous beep on the power supply, which goes away when I just unplug the connection from the motherboard. I do not know if this was normal before, since with TV the assembled this beep is not appreciated. Thank you all!
Hi @radioterror , Usually horizontal lines on a LCD TV are indicative of a panel problem. Here’s an image, taken from the service manual for the TV which shows the No Power troubleshooting flowchart, which may help
(click on image to enlarge for better viewing). Hopefully a start
