Hello! I have a Samsung UN40F6300AF LED TV that does not have a picture but does have sound. I do see the picture when I use a flashlight against the screen. From the web info I've read, I believe it is a backlight issue with either the power board (BN44-00645D) or possibly a bad LED light.
I'm not sure how to determine where the issue lies. I visually inspected the power board and don't see an issue. I tested the CNL802 LED outputs with the LEDs plugged in and unplugged, and show them below. I tested with a multimeter with the neg lead on the TV chassis and pos lead on the PIN (hope that's correct). The board diagram indicates CNL802 voltages of 136 and 182, but I'm not sure where those should be detected.
I also included pics of the TV configuration and boards.
Any guidance or suggestions would be greatly appreciated!!
CNL802 Unplugged:
PIN
1 NC 0V
2 NC 0V
3 0V
4 0V
5 0V
6 261V
7 NC 0V
8 NC 0V
9 0V
10 0V
11 0V
12 261V
13 NC 0V
14 NC 0V
15 0V
16 0V
CNL802 Plugged
PIN
1 NC 0V
2 NC 0V
3 0V
4 198V
5 198V
6 261V
7 NC 0V
8 NC 0V
9 0V
10 0V
11 0V
12 261V
13 NC 0V
14 NC 0V
15 0V
16 0V
I'm not sure how to determine where the issue lies. I visually inspected the power board and don't see an issue. I tested the CNL802 LED outputs with the LEDs plugged in and unplugged, and show them below. I tested with a multimeter with the neg lead on the TV chassis and pos lead on the PIN (hope that's correct). The board diagram indicates CNL802 voltages of 136 and 182, but I'm not sure where those should be detected.
I also included pics of the TV configuration and boards.
Any guidance or suggestions would be greatly appreciated!!
CNL802 Unplugged:
PIN
1 NC 0V
2 NC 0V
3 0V
4 0V
5 0V
6 261V
7 NC 0V
8 NC 0V
9 0V
10 0V
11 0V
12 261V
13 NC 0V
14 NC 0V
15 0V
16 0V
CNL802 Plugged
PIN
1 NC 0V
2 NC 0V
3 0V
4 198V
5 198V
6 261V
7 NC 0V
8 NC 0V
9 0V
10 0V
11 0V
12 261V
13 NC 0V
14 NC 0V
15 0V
16 0V
Comment