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1.3 No Picture
1) AV board
1. Check that the Vcc-voltages(+5V, -5V) are applied to AV circuits.
Pins 47-50 of K10A, Pins 47-54 of K10B ..............5V
Pins 39-42 of K10B..............................................-5V
Check IC1001, IC1002 and IC1021.
2. Check that the following input signals are observed correctly.
2) Main board
1. Check the signals at following test points.
• Video signal at TP208, TP218
• V-sync signal at TP7224
• H-sync signal at TP7223
2. Check that the PC/AV switching signal is correct.
Pin 16 of IC5201 .................................................AV: H, PC: L
Pin 5 of IC5282....................................................AV: H, PC: L
3. Check that the RGB signals are observed at following test points.
TP211, TP221R, TP2211R ....................................R-signal
TP212, TP221G, TP2221G....................................G-signal
TP213, TP221B, TP2231B ....................................B-signal
4. Check that the signals are observed at following test points.
TPDHS, TP3322 ...................................................V-Sync,
TPDVS, TP3321 ...................................................H-Sync
5. Check that the S/H signals are observed at following test points.
TP501, TP511 ......................................................R-signal
TP531, TP512 ......................................................G-signal
TP561, TP513 ......................................................B-signal
6. Check that the NRS signals are observed at test points TP3581 and TP3582.
Part 4: Troubleshooting
4-7
SIGNAL K10A-pin No. K50A-pin No.
V-Sync 17-18 17-18
H-Sync 15-16 15-16
B 11-12 11-12
G 9-10 9-10
R 7-8 7-8
Video 33-34 33-34
S-C 29-30 29-30
S-Y 25-26 25-26