LG STUDIOWORKS 77M Service Manual page 8

NO VIDEO
(POWER INDICATOR ON)
CHECK
POWER INDICATOR
GREEN or ORANGE?
GREEN
CHECK
D712 ANODE
(-120V)?
YES
CHECK
G1 VOLTAGE?
(-10~20V)
YES
TROUBLE IN
D926, Q925 (6.3V)
3. NO RASTER
ORANGE
NO
NO
DPM MODE
(NO H and/or V SYNC)
TROUBLE IN
D712
TROUBLE IN
Q801~Q806