LG 47LH30 (CHASSIS:LA92A) Service Manual ▷ View online
LG Electronics. Inc. All right reserved.
C
2009
- 17 -
1. Power-up boot check
TROUBLESHOOTING
Check standby Voltage
P700 8pin : +5V_ST
NO
Check Power connector
and AC S/W on?
OK
Check Fuse
OK
Replace Power board
OK
Check X100 clock
NO
Replace X100
OK
Check P700 PWR_ON
2Pin : 5V
NO
Re-download software
OK
Replace Mstar(IC100)
or Main board
OK
Check Multi Voltage
P700 13pin : 12V,
18pin : 24V
NO
Replace Power board
OK
Check Q706 Output.
12V, 5V
NO
Replace Q706
OK
Check inverter control & error
P700 22pin : Low
P700 20pin : high
NO
Check Power board
or Module
OK
Check Mstar LVDS output
R812,R813 .R821
NO
Replace Mstar(IC100)
or Main board
2. Component Video
Check input signal format.
Is it supported?
OK
Check Component Cable.
OK
Check JK1200
NO
Replace Jack.
OK
Check Mstar LVDS output
NO
Replace Mstar(IC100)
or Main board
- 18 -
LG Electronics. Inc. All right reserved.
C
2009
3. Digital TV Video
Check RF Cable & Signal
OK
Check Tuner 5V Power
TU1001 4Pin
NO
Check IC1002
Check IC1005(19",22")
OK
Check IF_P/N Signal
NO
Bad Tuner. Replace Tuner.
OK
Check Check Demodulator Input
Clock(X1005)
NO
Replace X1005
OK
Check IC400(LGDT) Output
- AR1070, AR1071
NO
Replace IC1004
OK
Check Mstar LVDS output
R812,R813 .R821
NO
Replace Mstar(IC100)
or Main board
4. Analog TV Video
Check RF Cable
OK
Check Tuner 5V Power
TU1001 4Pin
NO
Check IC1002
Check IC1005(19",22")
OK
Check CVBS signal.
TU1001 #19 Pin
NO
Bad Tuner. Replace Tuner.
OK
Check Mstar LVDS output
NO
Replace Mstar(IC100)
or Main board
LG Electronics. Inc. All right reserved.
C
2009
- 19 -
5. RGB Video
Check input signal format.
Is it supported?
OK
Check RGB Cable conductors
for damage
OK
Check JK1204
NO
Replace Jack.
OK
Check EDID
NO
Replace the defective IC or
re-download
EDID data.
OK
Check signal
R/G/B/H/V-Sync
C113,C108,C114,R146,R149
NO
Check other set.
If no problem, check signal
line.
OK
Check Mstar LVDS output
NO
Replace Mstar(IC100)
or Main board
6. AV Video
Check input signal format.
Is it supported?
OK
Check AV Cable for damage or
open conductor.
OK
Check JK1200
NO
Replace Jack.
OK
Check Mstar LVDS output
NO
Replace Mstar(IC100)
or Main board
LG Electronics. Inc. All right reserved.
C
2009
- 20 -
7. HDMI Video
Check input signal format.
Is it supported?
OK
Check HDMI Cable for damage
or open conductor
OK
Check JK500,501,502
NO
Replace Jack.
OK
Check EDID & EEPROM
IC500,501,502
I2C Signal (#5, #6)
NO
Replace the defective IC or
re-download
EDID data.
OK
Check HDCP key
NVRAM(IC105)
power & I2C Signal (#5 #6)
NO
Replace the defective IC.
OK
Check HDMI Signal
NO
Check other set.
If no problem, check signal
line.
NO
Replace Main board
OK
Check Mstar LVDS output
NO
Replace Mstar(IC100)
or Main board
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