Hello everybody, I could use some help on this one... It's got me guessing...
I took pictures of all the boards and the pin out of the connector on the power supply that goes to the main board... I measured all the pins in relation to chassis ground, here are the result.
(B13v)1. 12.7 volts cycling (Vamp) 2. 12.7 volts cycling
(B13v)3. 12.7 volts cycling (PWM5) 4. 1.0 volts cycling
(OD_LE)5. 2.8 volts cycling (PWM4) 6. 0.9 volts cycling
(OD_ON)7. 2.8 volts cycling (PWM3) 8. 0.9 volts cycling
9. ground (PWM2) 10. 0.9 volts cycling
(B13v) 11. 12.7 volts cycling (PWM1) 12. 0.9 volts cycling
(B13v) 13. 12.7 volts cycling (B13v) 14. 12.7 volts cycling
(Vamp) 15. 12.7 volts cycling (BLU_ON) 16. 4.4 volts cycling
(Vamp) 17. 12.7 volts cycling 18. ground
19. ground 20. ground
(B5v) 21. 5.3 volts cycling (A5v) 22. 5.3 volts steady
(B5v) 23. 5.3 volts cycling (PS_ON) 24. 3.3 volts cycling
The only voltage that remains steady is the 5 volt circuit on pin 22 im assuming is the stanby voltage...
I also checked all the led circuits un plugged with an external LED tester and they all lit up, I know this because I took the screen out and visually saw each LED light up. And all of the +L1 through + L5 have voltage on them with +L2 & +L3 being a higher voltage because there are more leds on those circuits...
So basically I think I eliminated the power supply and the leds as being the fault, I can't find anything wrong there. If I unplug the T-con board the power cycling stops but the screen is dark in the middle from top to bottom with the top of the screen lit up and the bottom of the screen lit up. This is an edge lit screen having leds on both sides. So circuits 2 and 3 on both strips aren't lighting up I don't know why but it is what it is.
Any Help would be appreciated Thank you...
I took pictures of all the boards and the pin out of the connector on the power supply that goes to the main board... I measured all the pins in relation to chassis ground, here are the result.
(B13v)1. 12.7 volts cycling (Vamp) 2. 12.7 volts cycling
(B13v)3. 12.7 volts cycling (PWM5) 4. 1.0 volts cycling
(OD_LE)5. 2.8 volts cycling (PWM4) 6. 0.9 volts cycling
(OD_ON)7. 2.8 volts cycling (PWM3) 8. 0.9 volts cycling
9. ground (PWM2) 10. 0.9 volts cycling
(B13v) 11. 12.7 volts cycling (PWM1) 12. 0.9 volts cycling
(B13v) 13. 12.7 volts cycling (B13v) 14. 12.7 volts cycling
(Vamp) 15. 12.7 volts cycling (BLU_ON) 16. 4.4 volts cycling
(Vamp) 17. 12.7 volts cycling 18. ground
19. ground 20. ground
(B5v) 21. 5.3 volts cycling (A5v) 22. 5.3 volts steady
(B5v) 23. 5.3 volts cycling (PS_ON) 24. 3.3 volts cycling
The only voltage that remains steady is the 5 volt circuit on pin 22 im assuming is the stanby voltage...
I also checked all the led circuits un plugged with an external LED tester and they all lit up, I know this because I took the screen out and visually saw each LED light up. And all of the +L1 through + L5 have voltage on them with +L2 & +L3 being a higher voltage because there are more leds on those circuits...
So basically I think I eliminated the power supply and the leds as being the fault, I can't find anything wrong there. If I unplug the T-con board the power cycling stops but the screen is dark in the middle from top to bottom with the top of the screen lit up and the bottom of the screen lit up. This is an edge lit screen having leds on both sides. So circuits 2 and 3 on both strips aren't lighting up I don't know why but it is what it is.
Any Help would be appreciated Thank you...
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