Hi All.
I have the above Samsung LCD TV,
When first plugged in and powered on, it works fine for 20 minutes or so. The backlight then shuts off (but sound is still fine, and I can still see the image working by shining a flashlight into the screen.)
If i restart it shortly thereafter, the Backlight only stays on for at most a minute or 2, then shuts off.
WHen on, the backlight looks even.
I have cleaned both the PSU and inverter boards.
LD (Pins 7 and 8) are 9.6vdc when the backlight is on. It then drops low (maybe to 2vdc), at which time the Backlight turns off, they then go back up to 9.6v. But the backlight remains off. I think the other day I actually noticed the voltage drop twice before the backlight cut out.
B13V is 12.52v stable
FB1 and FB2 are both 0v constant (unless there is a spike too short for my multimeter to detect)
Any suggestions on where to look. I believe it may be heat related, either Capacitor or one of the CFL tubes, But on the PSU board, I do not notice any large electrolytic caps in the Inverter Section for the CFLS.
I have a diagram for the PSU board and it's interconnects, but I am stumped.
I was told if I could get it working, I could keep it, and the wife would really like a larger TV for the Lounge, So I am trying my best.
Thanks for any info you can provide.
Peter
I have the above Samsung LCD TV,
When first plugged in and powered on, it works fine for 20 minutes or so. The backlight then shuts off (but sound is still fine, and I can still see the image working by shining a flashlight into the screen.)
If i restart it shortly thereafter, the Backlight only stays on for at most a minute or 2, then shuts off.
WHen on, the backlight looks even.
I have cleaned both the PSU and inverter boards.
LD (Pins 7 and 8) are 9.6vdc when the backlight is on. It then drops low (maybe to 2vdc), at which time the Backlight turns off, they then go back up to 9.6v. But the backlight remains off. I think the other day I actually noticed the voltage drop twice before the backlight cut out.
B13V is 12.52v stable
FB1 and FB2 are both 0v constant (unless there is a spike too short for my multimeter to detect)
Any suggestions on where to look. I believe it may be heat related, either Capacitor or one of the CFL tubes, But on the PSU board, I do not notice any large electrolytic caps in the Inverter Section for the CFLS.
I have a diagram for the PSU board and it's interconnects, but I am stumped.
I was told if I could get it working, I could keep it, and the wife would really like a larger TV for the Lounge, So I am trying my best.
Thanks for any info you can provide.
Peter
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