Philips V40 107P5 Service Manual page 35

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E. CPU
check list
Pin 10,11,12 B (Q2
~Q4) S-cap switch
Pin18 Hunlock
Pin 20 p.s .
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Repair Flow Chart (Continued)
Basic Check
33,34,40,41
Hsync / Vsync
check pin 18
Normal=Hi
Blank=low
LED
Pin 22. Degauss
Pin 5, Reset
check cpu pin6= 5V
pin9/pin8=12MhZ
pin7=gnd
check Q1-Q2
Pin 10~13
low : 0
hi :1
check sync.
Hsync_in=pin40
Vsync_in=pin41
Hsync_out=pin34
Vsync_out=pin33
pin 27 LED
pin 20 OFF
check
active=hi
no active=low
Check
normal >3.3
reset <3.3
V40 107P5
9
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107P5 S-CAPACITOR
Hor. Freq.(KHz) Q4
~ 27.5
0
27.5~33.24 0
33.24~36.51 1
36.51~40.00 0
40.00~45.00 1
45.00~52.00 0
52.00~55.00 0
55.00~62.00 1
62.00~70.00 0
70.00~76.00 1
76.00~86.15 0
>86.15 1
Free run 0
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
power saving pin20
Normal hi
Off low
35
SWITCH TABLE
Q3 Q2 Q1
0 0 0
0 0 0
1 0 0
1 1 0
1 1 0
0 0 1
1 0 1
1 0 1
0 1 1
0 1 1
1 1 1
1
1 1
0 0
0