Toshiba CN27E90 Technical Training Manual page 40

(4) MEMORY CIRCUIT CHECK
(5) NO INDICATION ON SCREEN
Check of sync signal at pins 26, 27 of QA01.
Memory circuit check
Voltage check at pin 8 of QA02 (5V).
OK
Pulse input at pins 5 and 6 of QA02
in memorizing operation.
OK
Replace QA02.
Note: Use replacement parts for QA02.
Adjust items of TV set adjustment.
No indication on screen.
Check of character signal at pin 23
of QA01. (5V )
P-P
OK
Input of OSC waveform at pin 29 of QA01
with indication key pressed.
OK
OK
Replace QA01.
NG
Check power circuit.
NG
Check QA01.
NG
Check V/C/D circuit.
NG
Check OSC circuit.
Check sync circuit.
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