LG 37LD450 (CHASSIS:LT01B) Service Manual ▷ View online
2. Digital TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L5003
Replace L5003
Check Tuner 1.2V Power
IC5001 2 pin : 1.2V
Check IF_P/N Signal
TU5001 17/18 Pin
Replace IC5001.
Check Tuner 5V Power
L5002
Check IC401
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
No
Replace IC401
No
Bad Tuner. Replace Tuner.
Replace L5002
ok
3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L5003
Replace L5003
Check Tuner 1.2V Power
IC5001 2 pin : 1.2V
Check CVBS Signal
TU5001 11 Pin
Replace IC5001.
Check Tuner 5V Power
L5002
Check IC401
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
No
Replace IC401
No
Bad Tuner. Replace Tuner.
Replace L5002
ok
4. AV Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK3801 , JK3302
CVBS Signal Line
R246 , R4016
ok
ok
ok
No
Replace Jack
5. Component Video
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK3801
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
Replace R3802 or R3803
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
No
Check COMP_DET Signal
Replace R3804 or R3805
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
6. RGB Video
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID & EEPROM
IC1105 I2C Signal
R1141, R1143(SDA,SCL)
Check JK1104
H/V_Sync/R/G/B Signal Line
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
ok
Replace Jack
Check DSUB_DET
Replace R1146 or R1147
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
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