Philips 107S2 CM2300 Service Manual page 38

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42
107S2 CM23 GSIII
9
Go to cover page
E. CPU
Basic Check
check list
3. H-EHT
4,5,6 (Q3,Q2,Q1)
S-cap switch
13~17 Hsync / Vsync
18. Hunlock
19. Blanking
21, 22 P.S.
23. Degauss
26, Reset
Back
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Repair Flow Chart
check cpu pin11/ pin32= 5V
pin9/pin10=12MhZ
pin12/pin31=gnd
H size compensation for
the load variance
check Q1-Q3
pin6/pin5/pin4
check pin18
normal=Hi
blank=low
check pin3
normal : low
change timing : Hi
pin 21 STBY
LED pin 22
check
active=hi
no active=low
check
from 5V to 0V
33.24~36.51
36.51~42.38
42.38~47.48
47.48~53.10
53.10~58.25
low : 0
58.25~61.89
hi :1
61.89~66.00
> 66.00
check sync.
Hsync_in=pin13
Vsync_in=pin16
Hsync_out=pin14
Vsync_out=pin17
power saving
normal
OFF standby
off
check
2814 / 6811 / 3834
Fh-khz Q1 Q2 Q3
<33.24 0 0 0
0 0 0
1 1 0
0 0 1
0 0 1
1 0 1
0 1 1
1 1 1
1 1 1
1 . Normal
Fhout=Fhin
Fvout=Fvin
2. Self test
Hout=46.875Khz
Fvout=75Hz
3.sync out of rang
Fhin>72.8
Fvin>168Hz
pin21 pin22
hi hi
low hi
low low
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