Toshiba CN27E90 Technical Training Manual page 39

(2) NO ACCEPTION OF KEY-IN
Key on TV
Voltage change at pins 17, 18 of
Replace QA01.
Remote unit key
Pulse input at pin 35 of QA01,
When remote unit key is pressed.
Replace QA01
(3) NO PICTURE (SNOW NOISE)
No picture
Voltage at pins of +5V, and 32V.
Check H001.
QA01 (5V to 0V).
OK
OK
OK
NG
Check key-in circuit.
NG
Check tuner power circuit.
NG
Check tuner power circuit.
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