LG CS990D-EP Service Manual page 22

NO V-DEFLECTION
(ONE HORIZONTAL LINE)
CHECK
IC601 Pin 2
(15V) ?
YES
CHECK
IC601 PIN 4
(-12V)?
YES
CHECK
IC701 PIN 12
(SAWTOOTH WAVE)?
YES
TROUBLE IN
IC601, V-CIRCUIT
4. NO VERTICAL DEFLECTION
NO
NO
NO
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TROUBLE IN
T901 PIN 15
TROUBLE IN
T901 PIN 17
TROUBLE IN
IC701