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E. CPU
Basic Check
check list
31. H-EHT
10,11, (Q2,Q1)
S-cap switch
33,34,40,41
Hsync / Vsync
18. Hunlock
19. Blanking
20, 27,28 P.S.
22. Degauss
5, Reset
Repair Flow Chart (Continued)
check cpu pin6= 5V
pin9/pin8=12MhZ
H size compensation for
the load variance
check pin18
normal=Hi
blank=low
check pin19
normal : low
(mute)
change timing : Hi
pin 27 STBY
LED
pin 20
no active=low
from 5V to 0V
pin7=gnd
70K S-CAPACITOR SWITCH TABLE
check Q1-Q2
pin10~11
low : 0
hi :1
check sync.
Hsync_in=pin40
Vsync_in=pin41
Hsync_out=pin34
Vsync_out=pin33
power saving
normal
OFF
standby
check
active=hi
check
M32 107E4 GS_3
Go to cover page
Hor. Freq.(KHz)
Q1
< 27.00
0
27.50-33.24
0
33.24-36.51
0
36.51-42.38
1
42.38-45.07
1
45.07-53.10
0
53.10-58.25
0
58.25-61.89
1
61.89-66.00
1
> 66.00
1
1 . Normal
Fhout=Fhin
Fvout=Fvin
2. Self test
Hout=48Khz
Fvout=72Hz
3.sync out of rang
Fhin>72.8kHz,<28kHz
Fvin>168Hz, <45Hz
pin27 pin20
hi
hi
low
hi
off
low
low
check
2806 / 3834
49
Q2
0
0
0
0
0
1
1
1
1
1
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