LG E700S Service Manual - Page 20

Trouble In Dpm

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8. TROUBLE IN DPM OFF MODE FAILURE (NO OFF MODE.) CHECK IC401 (MICOM) PIN 31, 32 (H/V INPUT) SIGNAL? YES H/V SYNC NO INPUT H/V SYNC SIGNAL CHECK IC401 PIN 13 WAVEFORM? 5V 24MHz YES CHECK IC401 (MICOM) PIN 2, 3 ? SEE DPM TABLE YES NO NO (DPMF: 0V) CHECK B+ LINE NO (6.3V,15V, 80V) ? CHECK PC, (PC IS NOT GOING INTO DPM OFF MODE) TROUBLE IN X401 TROUBLE IN IC401 (MICOM) TROUBLE IN Q941, Q942, Q951, Q952 YES TROUBLE IN PC Mode Item NORMAL STAND-BY SUSPEND OFF DPM TABLE DPMF H H H L DPMS H L L L LED GREEN AMBER AMBER AMBER - 20 -

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- 20 -
CHECK
IC401 (MICOM)
PIN 31, 32 (H/V INPUT)
SIGNAL?
CHECK
IC401 PIN 13
WAVEFORM?
CHECK
IC401 (MICOM)
PIN 2, 3 ?
CHECK
B
+
LINE
(6.3V,15V, 80V) ?
CHECK PC,
(PC IS NOT GOING INTO
DPM OFF MODE)
TROUBLE IN
X401
TROUBLE IN
IC401 (MICOM)
TROUBLE IN
Q941, Q942, Q951, Q952
TROUBLE IN PC
OFF MODE FAILURE
INPUT H/V SYNC SIGNAL
H/V SYNC
(NO OFF MODE.)
NO
NO
NO
NO
(DPMF: 0V)
DPM TABLE
Mode
Item
NORMAL
STAND-BY
SUSPEND
OFF
DPMF
H
H
H
L
LED
GREEN
AMBER
AMBER
AMBER
DPMS
H
L
L
L
YES
YES
SEE DPM TABLE
YES
YES
8. TROUBLE IN DPM
5V
24MHz