LG V7550 Service Manual page 18

OFF MODE FAILURE
CHECK
IC401 (MICOM)
PIN 30, 31 (H/V INPUT)
SIGNAL?
YES
H/V SYNC
CHECK
IC401 PIN 13
WAVEFORM?
5V
YES
12MHz
CHECK
IC401 (MICOM)
PIN 27 ?
SEE DPM TABLE
YES
CHECK
B + LINE
(6.3V,15V+) ?
YES
TROUBLE IN PC
7. TROUBLE IN DPM
(NO OFF MODE.)
NO
INPUT H/V SYNC SIGNAL
NO
NO
NO
Mode
- 18 -
CHECK PC,
(PC IS NOT GOING INTO
DPM OFF MODE)
TROUBLE IN
X401
(DPM: 0V)
TROUBLE IN
IC401 (MICOM)
TROUBLE IN
Q941, Q942, Q951, Q952,
DPM TABLE
Item
DPM
H
NORMAL
L
STAND-BY
L
SUSPEND
L
OFF
LED
GREEN
AMBER
AMBER
AMBER