ViewSonic G90FB-2 Service Manual download pdf (Page 24)

6-12. Power supply trouble shooting chart

Before check SW.REG.Please refer to the power supply block diagram power supply output

(A) Variable output: 60V

(B) Constant output : 6.3V, 12V,83V，180.V，－12V

BEAD SET

ABNORMAL VARIABLE OUTPUT

YES

CHECK BRIDGE

RECTIFIED

CHECK START C.K.T

CHECK IC101

CHECK D925

CHECK Q911

911 FAILURE

CHECK IC901

CHECK AC LINE

VOLT 120V OR 220V

CHECK F901, SW901

CHECK LINE RECTIFIED

& SMOOTHED VOLT

CHECK SENSE RESISTENCE

IC901 FAILURE

CHECK T901 O/P

MAKE SURE THAT

THE VARIABLE

OUTPUT IS NOT SHORTED

R936

PIN39,40,41, B+

DRIVER

6.5V CIRCUIT OUTPUT

IC101 PIN30(ABOUT5V)

CHECK 56V, 12

CHECK THE 56V OUTPUT

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ViewSonic G90FB-2 Service Manual Page 24