Philips V30 - Manual (Page 77)

Repair Flow Chart (Continued)
E. CPU
check list
check cpu pin6= 5V
pin9/pin8=12MhZ
pin7=gnd
power saving pin22
Normal hi
Standby low
Off low
33,34,40,41
Hsync / Vsync
Vblank
check sync.
Hsync_in=pin40
Vsync_in=pin41
Hsync_out=pin34
Vsync_out=pin33
Basic Check
check Q1-Q2
Pin 35~28
low : 0
hi :1
10,11, (Q2,Q1)
S-cap switch
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
check pin 3
Normal=vblank Pulse
Blank=Hi
20 LED driver
H size compensation for
the load variance
31. H-EHT
pin 22 OFF
check
from 0V to 5V
5, Reset
check
2801 / 3801
check
active=hi
no active=low
23. Degauss
9
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