Panasonic TX-40DS400E TV red light blinks once, backlight problem
Got a Panasonic TX-40DS400E flatscreen tv with a already damaged LCD screen (torn ribbon cable -> vertical lines on screen) and the 1 blink red light error. Im not really home in tv repairing but I tried my best.
Firstly I checked for any bad components on the boards but found none and then I checked the backlight LEDs, found 2 faulty ones which I soldered out and connected the rest. It was still throwing the same error. After that I tested the measure points on the P-board:
- SRV24V: 25.8V
- SRV16V: 16V
- SRV5.3V: 5.27V
- SRVLED went up to 51V, but decreased to 25.6V in standby mode
then on the A-board I could only measure the SRV-5.3V for 5.3V constantly, and the SRV-16V for 16V before going into standby mode.
I took a look at the backlight (3 strips) again and saw that the top strip which I took the 2 faulty ones out was turning on for a second, while the other two stayed for longer. (video explains better) But when I connected only the top strip, it stayed on for that duration like the other two.
What can I do at this point?
Update /2024.01.05./ Images of the A and P board, P board schematic diagram
And I found a service manual similar to this tv, all same boards, don't know if it's usable for this.
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