LG Flatron F920B Service Manual page 23

(POWER INDICATOR
GREEN or AMBER)
POWER INDICATOR
GREEN or AMBER ?
SCREEN CONTROL
KNOB OF FBT
VOLTAGE AT
D924/D926 CATHODE (190V)
D923/D929 CATHODE (80V)
IC904 OUT (12V)
D921 CATHODE
IC401 (MICOM) PIN 8, 6
5 14
5V (HIGH), IC801 PIN 10
21
PIN 10 IC802, PIN3
TROUBLE IN
IC401 (MICOM),
Waveforms
5
NO VIDEO
CHECK
GREEN
CHECK
YES
CHECK
(6.3V)?
YES
CHECK
12V (HIGH)?
YES
IC801
14
IC801, #6
3. NO RASTER
AMBER
NO
NO
NO
21
IC801, #8
- 21 -
TROUBLE IN
P302 SIGNAL CABLE
ROTATE SCREEN CONTROL
KNOB TO CLOCKWISE
or COUNTER CLOCKWIES
TROUBLE IN PRIMARY
CIRCUIT OF T901
TROUBLE IN
CDT SOCKET, BOARD
IC802, #3