Kortek P42SV Service Manual page 71

10.3.1 Abnormal Video (The 1
(Abnormal Image is on Video.(except abnormality in Sustain or Address))
[ Y-MAIN ]
Check Y-Buffer output,
Scan output &
Control signals
CN5406,5506(13pin)
Check input sinals of STV7617
Y-Buffer
Check scan output-Waveform
Y-MAIN
(M5003 Gate)
Check signal(VR5001,5002)
Y-MAIN
rising/falling slope
Y-MAIN
O.K
Rising SW
Output of IC5005
Kortek corporation
st
type)
☞ In checking input or output pins,
Check " No solder/Cold solder/Lead bent" on Connector Leads
Check output(2.4.6.8.10.12)pins
of the IC5005/7404
NG
Y-MAIN
NG
OK
NG
Y-MAIN
OK
NG
Replace the
FET(IRF540A)
NG
Adjust the slope
OK
Falling SW
The slope of
Rising/Falling
Check output(3.5.7.9.12.14.16.
18)pins of the IC5006,5007/LV244
OK
Y-MAIN
After check
NG
coldsoldering,
Pin-shorting,
Replace the IC
Check scan Input-voltage of the
R5008(4.7Ω )/CN5008(5th-pin)
IC5006,5007(LV244A) 3th,5th output-WAVE
Output of L-Out
70 of 99
Check input(2.4.5.8.9.12)pins of the
CN5002/CON_30pin
OK
Y-MAIN
NG
After check
coldsoldering,
Pin-shorting
Replace the IC
IC5006,5007(LV244A) 7th,9th,12th output-WAVE
3th-pin output of
LV244A
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