LG STUDIOWORKS 77M Service Manual page 13

OFF MODE FAILURE
CHECK
IC401 (MICOM)
PIN 1, 42 (H/V INPUT)
SIGNAL?
NO H/V SYNC
CHECK
IC401 PIN 6
WAVEFORM?
5V
YES
6MHz
CHECK
IC401 (MICOM)
PIN 9, 12 ?
SEE DPM TABLE
YES
CHECK
B + LINE
(6.3V,15V) ?
YES
TROUBLE IN PC
8. TROUBLE IN DPM
(NO OFF MODE.)
INPUT H/V SYNC SIGNAL
NO
NO (DPMF: 0V)
NO
Item
DPMS
Mode
NORMAL
STAND-BY
SUSPEND
OFF
CHECK PC,
(PC IS NOT GOING INTO
DPM OFF MODE)
TROUBLE IN
X401
TROUBLE IN
IC401 (MICOM)
TROUBLE IN
Q922, Q923, Q925, Q926
DPM TABLE
DPMF
H
H
L
H
L
H
L
L
LED
GREEN
ORANGE
ORANGE
ORANGE