I am trying to fix a Sharp LC-60LE600U TV. When plugged in the center icon will light and after 8 secs the backlight will turn on bright for split sec, then dim for split sec and the turn off. The center icon will turn off after 15 sec from power on. The center icon doesn't flash any error codes. I've tried the "input" "vol" reset, no luck.
With everything connected, here are the dc voltages I am getting out of the "PD" connector to main board.
P1- 12vdc, drops out as soon as BL turns off.
P2- 12vdc, just before BL turns on and slowly fades after BL turns off.
P3- 0
P4- 0
P5- 13.2vdc at plug in. Drops off after BL turns off.
P6- 13.2vdc at plug in. Drops off after BL turns off.
P7- 13.2vdc at plug in. Drops off after BL turns off.
P8- 0
P9- 0
P10- 0
P11- 0
P12- 0
P13- 3.36vdc at plug in, drops off after BL turns off
P14- 2.12vdc at plug in and stays on.
P15- 5vdc at plug in and stays on.
P16- 3.2vdc just before BL comes on and drops off after BL turns off
P17- jumps all over, up to 1vdc at plug in, to 0.3 at BL on, to 0 after BL turns off
P18- 0
P19- 0.09 at BL on
P20- 0
P21- 0
P22- 3.28vdc at plug in, drops to 0 when BL comes on.
P23- 0
P24- 3.2vdc at BL on, drops off after BL turns off.
R7900 - 2.4 ohm in the board
D7905 - open one way, 556 other way in board
Any ideas on what to test next? How do I tell if my Power Board is bad or my main board is bad? Please keep it simple, I'm a mechanical engineer.
With everything connected, here are the dc voltages I am getting out of the "PD" connector to main board.
P1- 12vdc, drops out as soon as BL turns off.
P2- 12vdc, just before BL turns on and slowly fades after BL turns off.
P3- 0
P4- 0
P5- 13.2vdc at plug in. Drops off after BL turns off.
P6- 13.2vdc at plug in. Drops off after BL turns off.
P7- 13.2vdc at plug in. Drops off after BL turns off.
P8- 0
P9- 0
P10- 0
P11- 0
P12- 0
P13- 3.36vdc at plug in, drops off after BL turns off
P14- 2.12vdc at plug in and stays on.
P15- 5vdc at plug in and stays on.
P16- 3.2vdc just before BL comes on and drops off after BL turns off
P17- jumps all over, up to 1vdc at plug in, to 0.3 at BL on, to 0 after BL turns off
P18- 0
P19- 0.09 at BL on
P20- 0
P21- 0
P22- 3.28vdc at plug in, drops to 0 when BL comes on.
P23- 0
P24- 3.2vdc at BL on, drops off after BL turns off.
R7900 - 2.4 ohm in the board
D7905 - open one way, 556 other way in board
Any ideas on what to test next? How do I tell if my Power Board is bad or my main board is bad? Please keep it simple, I'm a mechanical engineer.
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