Hi,
I have got Samsung UN55MU6290 UHD tv which is not powering on. When plugged in backlight comes on and then goes off in an about 10 seconds and it keeps happening. No video on screen at all. I checked backlights with BL tester and all looks good with BL. When measure voltage on main caps it jumps from 390v to 362v and rises again and keeps cycling. Below are the reading when mainboard connected to power board -
Pin | Signal Voltage Reading
1 | Fail Count 3.3 V
2 | ANA DIM 0.99 V
3 | A13V 12.8 V
4 | OD On-OFF 3.3 V
5 | A13V 12.8 V
6 | PWM BLU 3.3 V
7 | A13V 12.8V
8 | Power ON 3.3 V
9 | A13V 12.8V
10 | GND
11 | GND
12 | GND
I suspect the defect with main board as backlight keeps on when mainboard is disconnected. Could you help me to diagnose the exact issue?
I have got Samsung UN55MU6290 UHD tv which is not powering on. When plugged in backlight comes on and then goes off in an about 10 seconds and it keeps happening. No video on screen at all. I checked backlights with BL tester and all looks good with BL. When measure voltage on main caps it jumps from 390v to 362v and rises again and keeps cycling. Below are the reading when mainboard connected to power board -
Pin | Signal Voltage Reading
1 | Fail Count 3.3 V
2 | ANA DIM 0.99 V
3 | A13V 12.8 V
4 | OD On-OFF 3.3 V
5 | A13V 12.8 V
6 | PWM BLU 3.3 V
7 | A13V 12.8V
8 | Power ON 3.3 V
9 | A13V 12.8V
10 | GND
11 | GND
12 | GND
I suspect the defect with main board as backlight keeps on when mainboard is disconnected. Could you help me to diagnose the exact issue?
Comment