LG 55LV5400 (CHASSIS:LA12E) Service Manual ▷ View online
4. Trouble shooting - No video (AV)
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK11055 , JK1102 CVBS Signal Line
Rear AV : R1140
Side AV : R1136
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
• Rear AV Detect : R1129
• Side AV Detect : R1113
Replace R1129 or R1113
No
No
Check BCM LVDS Output
Replace LGE35230( IC101)
or Main Board.
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1105
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack
Check COMP_DET Signal
Replace R1114 or R130
No
ok
No
Check BCM LVDS Output
Replace BCM( IC101) or Main Board.
5. Trouble shooting - No video (Component)
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID & EEPROM
IC802 I2C Signal R848, R847(SDA,SCL)
Check JK804
H/V_Sync/R/G/B Signal Line
L806/7/8
ok
ok
ok
No
No
Re-download EDID data or Replace the defective IC
ok
Replace Jack
Check DSUB_DET
Replace R820
No
ok
No
Check BCM LVDS Output
Replace BCM( IC101).
6. Trouble shooting - No video (RGB-PC)
7. Trouble shooting - No video (HDMI)
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
for damage or open conductor.
Check HDMI Switch
IC701 video Signal and I2C line
Check JK70 1 / 2 / 3 / 4
ok
ok
ok
No
No
Replace Coil
ok
Replace Jack
Check HDMI Signal output
of HDMI Switch (IC701)
Replace the defective IC.
No
Check L2103(+3.3V)
Replace the defective IC.
No
OK
ok
No
Check BCM LVDS Output
Replace BCM( IC101) or Main Board.
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