ViewSonic P90F Service Manual download pdf (Page 32)

28

YES

NO

NO

YES

YES

YES

NO

NO

NO

NO

NO

YES

10.

TROUBLESHOOTING FLOW CHART

SECTION 1

Q811

o

n, Q812

o

ff

LED light up ?

LED color is Amber ?

C825 = 190V approx. ?

Q811 on

pin 2 of I803 > 2.5V

Check D815,D804, D816,

D817

,

D818

,

D819 short ?

OVP, D826 short? or Check

Q807

,

Q808 short ?

Load of secondary side

short ?

Fuse open ?

Check R807,R831

Q801

Check

D801

,

D802

,

D803

,

D800?

NO

Check pin 23 of IA01

(

> 3.3V

)

Check pin 41,42 of

IA01

YES

Check I807,I808,Q814 D827,

I804

YES

If D815, D850 are defective,

check Q402, Q433

Check if Q433, Q402,

short ?

Check if Q121, Q124

short ?

If disconnect P902 of

video board(PWB-0237) is

OK

then check I903 I901

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P90f-1

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