Hi,
I was given a samsung 65" lcd tv which is "dead" after a lightning strike.
Power supply board is a BN44-00808D , also have the marking L65S6N_FSM
Main board is a BN94-10803V
I've made some simple test.
With main board connected nothing happens when plugged in, no blinking lights or sounds.
Also kept it plugged in for a while and checked on the boards with a thermal camera, no hot spots detected.
With the main board disconnected the backlights turn on and stay on.
Checked the voltages in the connector going to the main board and they come out as follows,
Main board disconnected
pin name voltage
1 FAIL_COUNT 1,1
2 ANA_DIM 3,3
3 A13V 12,8
4 OD_On/Off 3,6
5 A13V 12,8
6 BLU_PWM 3,0
7 A13V 12,8
8 Power_On/Off 4,45
9 A13V 12,8
10 GND 0
11 GND 0
12 GND 0
Main board connected
pin name voltage
1 FAIL_COUNT 1,4
2 ANA_DIM 0
3 A13V 9,5
4 OD_On/Off 0
5 A13V 9,5
6 BLU_PWM 0
7 A13V 9,5
8 Power_On/Off 0
9 A13V 9,5
10 GND 0
11 GND 0
12 GND 0
As you can see the A13 voltage drops some which I find strange, if there was a short somewhere on the mainboard I think it would go to zero and/or a hotspot would be detected since the power board should be able to supply 4,7A.
I have no information about how the other voltages should behave unfortunately.
Thoughts on next step?
I was given a samsung 65" lcd tv which is "dead" after a lightning strike.
Power supply board is a BN44-00808D , also have the marking L65S6N_FSM
Main board is a BN94-10803V
I've made some simple test.
With main board connected nothing happens when plugged in, no blinking lights or sounds.
Also kept it plugged in for a while and checked on the boards with a thermal camera, no hot spots detected.
With the main board disconnected the backlights turn on and stay on.
Checked the voltages in the connector going to the main board and they come out as follows,
Main board disconnected
pin name voltage
1 FAIL_COUNT 1,1
2 ANA_DIM 3,3
3 A13V 12,8
4 OD_On/Off 3,6
5 A13V 12,8
6 BLU_PWM 3,0
7 A13V 12,8
8 Power_On/Off 4,45
9 A13V 12,8
10 GND 0
11 GND 0
12 GND 0
Main board connected
pin name voltage
1 FAIL_COUNT 1,4
2 ANA_DIM 0
3 A13V 9,5
4 OD_On/Off 0
5 A13V 9,5
6 BLU_PWM 0
7 A13V 9,5
8 Power_On/Off 0
9 A13V 9,5
10 GND 0
11 GND 0
12 GND 0
As you can see the A13 voltage drops some which I find strange, if there was a short somewhere on the mainboard I think it would go to zero and/or a hotspot would be detected since the power board should be able to supply 4,7A.
I have no information about how the other voltages should behave unfortunately.
Thoughts on next step?
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