LG 26LG40 (CHASSIS:LA89D) Service Manual ▷ View online
- 25 -
13. Analog TV Audio
Check video output
Follow procedure All source audio trouble
shooting
Y
Follow procedure analog TV video
trouble shooting
N
N
Replace
Mstar
IC
Check L400, L402
for
5V
Replace it
N
Y
Check SIF buffer signal
Replace it
N
Y
Check SIF signal
C409
Replace it
N
Y
- 26 -
14. Component/ DVDP/ RGB/ AV Audio
Check video output
Y
Follow procedure external
input video trouble shooting
N
Check Connector
and cables
JK602 / JK603 (Component)
JK607 (RGB)
JK601 / JK604 (AV Rear, AV Side)
Replace connector
or cable
if found damaged
N
Y
Check signal
R618 / R619 (Component1)
R645 / R646 (Component2)
R645 / R646 (Component2)
R654 / R655 (RGB)
R6092 / R6094 (AV Rear)
R6090 / R6096 (AV Side)
Replace it
N
Y
Check IC602
Pin 14 for 5V
Replace it
N
Y
Check Audio out signal
IC602 #2,3 #9,10
Replace it or IC602
N
Y
Check IC100 signal
C102, C103, C104, C105, C176, C182
Replace it
N
Y
Check I2S signal
R1035, R1037, R1038
Replace it or IC100
N
Y
Check Audio clock
R1036
Replace it
N
Y
Replace
Mstar
IC
- 27 -
15. HDMI Audio
Check video output
from source device
.
Follow procedure All source audio trouble
shooting
Y
Follow procedure HDMI video trouble
shooting
N
N
Replace
Mstar
IC
Check EDID NVRAM (IC801, 802, 804)
Power & I2C Signal (#5, #6)
Replace it or re-download
EDID data.
Y
N
16. USB
Check USB 2.0 Cable
for damage or open
conductors
Check L801 voltage level 5V
Y
N
Replace it
Check JK804
Replace it
Y
N
Check USB Device
If device is 2.5 inch HDD,
Do not connect, only upgrade
Y
Replace
Mstar
IC
Y
• Exception
- USB power could be disabled by inrushing current
- In this case, remove the device and try to reboot the TV (AC power off/on)
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BLOCK DIAGRAM
1. OVERVIEW
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