Hi, I have an old tv that has sound but no image. No image even with flashlight. These are the things I have tried:
- Unplugging cable from power supply board to main board resulted in backlights lighting up (tv was on at this point). This likely means that LED strip are ok
- Used backlight tester on leads on power supply board. Both LED strips showed 173V, and both lit up when tested. Yet nothing on tv screen except for a faint glow of the backlights
- Unplugging LVDS cables from T-Con to panel (first left cable, then right cable) did not show anything on screen. Backlight remained off
- When measuring voltage on power supply plug (to mainboard), all voltages (PS on/off = 5V, Blu on/off = 13V, PWM_DIM = 13V) were good for about 5-10 seconds, then all go to zero. And as mentioned, backlights remain off
Seems to me like a main board problem, but anybody know if this model is known to have a specific component fail on the main board? Given the age of the tv, if I have to buy a main board then it is not worth fixing.
Appreciate if experts on this board can advice. Thanks!
- Unplugging cable from power supply board to main board resulted in backlights lighting up (tv was on at this point). This likely means that LED strip are ok
- Used backlight tester on leads on power supply board. Both LED strips showed 173V, and both lit up when tested. Yet nothing on tv screen except for a faint glow of the backlights
- Unplugging LVDS cables from T-Con to panel (first left cable, then right cable) did not show anything on screen. Backlight remained off
- When measuring voltage on power supply plug (to mainboard), all voltages (PS on/off = 5V, Blu on/off = 13V, PWM_DIM = 13V) were good for about 5-10 seconds, then all go to zero. And as mentioned, backlights remain off
Seems to me like a main board problem, but anybody know if this model is known to have a specific component fail on the main board? Given the age of the tv, if I have to buy a main board then it is not worth fixing.
Appreciate if experts on this board can advice. Thanks!
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