LG 22LG3DDH (CHASSIS:LA96E) Service Manual ▷ View online
1. Power-up boot check
Check standby Voltage
P1408 9pin : +3.5V_ST
→
NO
Check Power connector
→
OK
Check Fuse
→
OK
Replace Power board
↓ OK
Check DC-DC output
IC3000 Pin 6: +5V_ST_PTC
→
NO
Replace IC3000
↓ OK
Check Q404 Output
Pin 8: +5V_ST
→
NO
Re-download PTC S/W
↓ OK
Check X100 clock
→
NO
Replace X100
↓ OK
Check P1408 OR_RELAY_ON
1Pin : 3.5V
→
NO
Re-download software& PTC
→
OK
Replace Mstar(IC100)
or Main board
↓ OK
Check Multi Voltage
P1408 17pin : 12V,
2pin : 24V
→
NO
Replace Power board
↓ OK
Check Q706 Output.
12V, 5V
→
NO
Replace Q706
↓ OK
Check inverter control & error
P1408 18pin : Low
P1408 20pin : high
→
NO
Check Power board
or Module
↓ OK
Check Mstar LVDS output
R847,R848….R856
→
NO
Replace Mstar(IC100)
or Main board
2. Digital TV Video
Check RF Cable & Signal
↓ OK
Check Tuner 5V Power
TU1001 4Pin
→
NO
Check IC1002
Check IC1003
Check IC1003
↓ OK
Check IF_P/N Signal
→
NO
Bad Tuner. Replace Tuner.
↓ OK
Check Check Demodulator Input
Clock(X1005)
→
NO
Replace X1005
↓ OK
Check IC1004(LGDT) Output
- AR1070, AR1071
→
NO
Replace IC1004
↓ OK
Check Mstar LVDS output
R847,R848….R856
→
NO
Replace Mstar(IC100)
or Main board
3. Analog TV Video
Check RF Cable
↓ OK
Check Tuner 5V Power
TU1001 4Pin
→
NO
Check IC1002
Check IC1003
Check IC1003
↓ OK
Check CVBS signal.
TU1001 #19 Pin
→
NO
Bad Tuner. Replace Tuner.
↓ OK
Check Mstar LVDS output
→
NO
Replace Mstar(IC100)
or Main board
4. Component Video
Check input signal format.
Is it supported?
↓ OK
Check Component Cable.
↓ OK
Check JK1207
→
NO
Replace Jack.
↓ OK
Check Mstar LVDS output
→
NO
Replace Mstar(IC100)
or Main board
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 JK1206
→
NO
Replace Jack.
↓ OK
Check Mstar LVDS output
→
NO
Replace Mstar(IC100)
or Main board
7. HDMI Video
Check input signal format.
Is it supported?
↓ OK
Check HDMI Cable for damage or
open conductor.
↓ OK
Check JK500
→
NO
Replace Jack.
↓ OK
Check EDID & EEPROM IC500
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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