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Repair Flow Chart (Continued)
{4 Go to cover page
i
F
basic check
O. Vertical Deflection Failure
H2/40V
[
T
No
No
check 7501
Benga
Ok—|
Pin22,pin13 ramp
exist ?
Repair Flow Chart (Continued)
44 Go to cover page
:
;
iets
check cpu pin6= 5V
i pr i
Basic Check
pin9/pinB=12MhZ
ores
s
os
pin7=gnd
[ot
Je
ae
Le
foe
He
pea
iar
.
7
wmem
fot
foe
foe
H size compensation for
srmsiog [
6
:
ot Srer
the load variance
wane
forfeit
f o s
inermim
[hfe
fe
10,11, (Q2,Q1)
S-cap switch
33,34,40,41
Hsyne / Vsyne
or
o
ical
check Q1-Q2
:
'
s
Pin 35~28
:
!
'
low : 0
ee
hi:
.
:
.
1
°
\
'
1
n
1. Normal
Fhout=Fhin
check sync.
Fvout=Fvin
Hsync_in=pin40
2. Self test
Vsync_in=pin41
—
Hout=48Khz
Hsync_out=pin34
Fvout=72Hz
Vsync_out=pin33
3.sync out of rang
Fhin>72.8kHz,<28kHz
Fvin>168Hz, <45Hz
Hoes al Re nik
Vblank
»{|
Normal=vblank
Pulse
Blank=Hi
GIS
eae gy
power saving
pin22
20 LED driver |
___._.,|
Normal
hi
pin22
OFF
Standby
low
|
OH
low
check
23. Degauss
active=hi
no active=low
5, Reset
check
check
from OV to 5V
2801 / 3801
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