Tv backlights not coming on:-
Power on - Standby red light on (red)
Press start button - Red standby light flashes 3 times then goes off. No backlights on at anytime during start up - no picture on screen with backlights off. I have checked all backlights in situ using 6v supply across test points on backlight strip, all light up.
Power Supply voltages at Led plug and P201 plug when connected to main board.
Stand by - Led + 59.8v P201 — MS 0v P-Dim1 1.9v
Led - 40.6v. GND 0v GND. 0v
Led + 59.8v (13.2v) 7.8v (13.2v) 7.8v
Led - 41.6v (13.2v) 7.8v (13.2v) 7.8v
GND 0v (13.2v) 7.8v
PWR-ON 0v P-Dim2 1.9v
Power on Led + 87.3v P201 — MS 0v P-Dim1 0v
Led - 66.9v GND 0v GND 0v
Led + 87.3v (13.2v) 13.1v (13.2v) 13.1v
Led - 70.0v (13.2v) 13.1v (13.2v) 13.1v
GND 0v (13.2v) 13.1v
PWR-ON 3.3v P-Dim2 0v
The voltage rise at the Led is smooth and stable. I cannot see anything obviously wrong on the boards. Please see attached photos.
Power on - Standby red light on (red)
Press start button - Red standby light flashes 3 times then goes off. No backlights on at anytime during start up - no picture on screen with backlights off. I have checked all backlights in situ using 6v supply across test points on backlight strip, all light up.
Power Supply voltages at Led plug and P201 plug when connected to main board.
Stand by - Led + 59.8v P201 — MS 0v P-Dim1 1.9v
Led - 40.6v. GND 0v GND. 0v
Led + 59.8v (13.2v) 7.8v (13.2v) 7.8v
Led - 41.6v (13.2v) 7.8v (13.2v) 7.8v
GND 0v (13.2v) 7.8v
PWR-ON 0v P-Dim2 1.9v
Power on Led + 87.3v P201 — MS 0v P-Dim1 0v
Led - 66.9v GND 0v GND 0v
Led + 87.3v (13.2v) 13.1v (13.2v) 13.1v
Led - 70.0v (13.2v) 13.1v (13.2v) 13.1v
GND 0v (13.2v) 13.1v
PWR-ON 3.3v P-Dim2 0v
The voltage rise at the Led is smooth and stable. I cannot see anything obviously wrong on the boards. Please see attached photos.
Comment