LG 26LG40 (CHASSIS:LA89D) Service Manual ▷ View online
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8. RGB Video
Check
inpu
t signal format
Is it supported?
Check signal, Hsync, Vsync
R673, R674
Replace it.
Check signal
R678, R679, R680
Y
Y
N
Check JK607
Replace connector
Y
N
Y
Replace it.
N
Replace
Mstar(IC100)
Y
Check Signal
C116, C124, C126
Replace it
N
Check RGB Cable
conductors for
damage
Y
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9. AV Video
Check
input
signal format
Is it supported?
Check signal
C948 (Composite), C991 / C992 (S-Video) (Rear)
C949 (Composite)
Replace it.
Check signal
C111 (Composite), C109 / C110 (S-Video) (Rear)
C174 (Composite) (Side)
Y
N
Check JK601 (Rear)
Check JK604 (Side)
Replace
or reseat
connector
Y
N
Y
Replace it
N
Replace
Mstar(IC100)
Y
Check AV Cable / S-Video Cable
for damage or
open conductors
Y
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10. HDMI Video
Check
input
signal format
Is it supported?
Y
Check J801 / J802 / J803
for proper
connection or damage
Replace connector
Y
N
Y
Check HDMI Cable
for damage or open
conductors
Check EDID NVRAM
(IC801, 802, 804)
Power & I2C Signal (#5, #6)
Replace
the defective IC
or re-download
EDID data
Y
N
Check HDCP Key NVRAM (IC102)
Power & I2C Signal (#5, #6)
Replace
the defective IC
Y
N
Check IC803 Out Voltage Level
3.3V
Replace it
Y
N
Check L802 Voltage Level 3.3V
Replace it
Y
N
Check IC803 Clock Signal
#26, #27
Replace
IC803
Y
N
Replace
Mstar(IC100)
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11. All source Audio
Make sure you can’t hear any audio
Check Signal
L919, L920
Replace it.
Check Signal
L509, L510, L511, L512
Y
N
Check IC502 Power 16V, 3.3V, 1.8V
Re-check
Y
N
Y
Replace it
N
Check Connector
JK501
Y
Check Mstar I2S Output
R1035, R1037, R1038
Y
Replace it.
N
Replace connector
if found to be
damaged
N
Check speaker
resistance and cone for damage.
Y
Replace speaker
Y
Replace
NTP3000A Replace it
N
12. Digital TV Audio
Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure digital TV video
trouble shooting
N
N
Replace
Mstar
IC
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