LG CS990D-EP Service Manual page 21

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(POWER INDICATOR
GREEN or ORANGE)
CHECK
POWER INDICATOR
GREEN or ORANGE ?
GREEN
CHECK
SCREEN CONTROL
KNOB OF FBT
OK
CHECK
VOLTAGE AT
D912 CATHODE (190V)
D909 CATHODE (80V)
IC904 OUT (12V)
D906 CATHODE
(6.3V)?
YES
CHECK
IC401 (MICOM) PIN 5
5V (HIGH), IC701 PIN 10
12V (HIGH)?
YES
TROUBLE IN
IC401 (MICOM),
IC701
3. NO RASTER
ORANGE
MIN.
(Counter-clockwise)
NO
NO
- 21 -
TROUBLE IN
P402 SIGNAL CABLE
ROTATE SCREEN
CONTROL KNOB TO
CLOCKWISE
TROUBLE IN PRIMARY
CIRCUIT OF T901
TROUBLE IN
CDT SOCKET, BOARD