BenQ PB6100 Service Manual page 76

Smaller boards
FAN/BD
Yes
Keypad
function
Yes
Rear Front IR
function
PFC BOARD
Fan control:
1.chk the voltage of Q F1 (5,6,7,8)
2.chk the fan voltage U502(2,15),U503(8)
3.check Y501(32.768kHz)
No
No 5V
1.Check Q 701 & therm al Breaker
LED dark
1.chk LED voltage from J1
No 2.chk the m ounting direction of LEDs
No work
1.chk buttons contact to PCB
No
1.chk U1 voltage source(5V)
2.chk U1 output signal (always 5Vdc in regular tim e,no pulse voltage)
76