ViewSonic P90F Service Manual download pdf (Page 34)

SECTION 3

LED Green

No Raster

Is DC Voltage at Pin2 of

FBT Pro

(

80 V A

rox.

)

YES

Is the voltage 6.3V at

heater?

YES

Check Q121 output

300 V

rox.

Check I101 pin 2 > 2.5V

Check OVP CKT setting

build by Q114,115,116

Is the voltage at collector of

433

er ?

YES

Go to SECTION 4 No

raster ,but High Voltage

exist

Check SMPS DC O/P

(

SECTION 1

)

Check S.M.P.S

(SECTION 1)

Check P902 connection

OK ?

YES

Check P904 connection

OK ?

YES

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ViewSonic P90F Service Manual Page 34