LG 42LG30 (CHASSIS:LA85D) Service Manual ▷ View online
- 21 -
HDMI Video
Check input signal format
Is it supported?
Y
Check JK800 / JK801 / JK903
Replace Jack
Y
N
Y
Check HDMI Cable for damage or
open conductors
Check EDID NVRAM
(IC800, 801, 902)
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 HDMI Signal
Check signal line.
Y
N
Check IC802 Voltage Level 3.3V, 5V
& Output
Replace Power supply regulator
Or IC802
Y
N
Check IC802 Clock Signal
#26, #27
Replace IC802
Y
N
Replace Mstar(IC100)
- 22 -
All Source Audio
Make sure you can’t hear any audio
Check Output Signal
L503, L504
Replace NTP or check output line.
Y
N
Check IC501 Power 16V, 3.3V, 1.8V
Check power supply regulator & line.
Y
N
Check Connector & P500
Y
Check Mstar I2S Output
R1048, R1050, R1051
Y
Check signal line. Or replace IC100
N
Replace connector if found to be
damaged
N
Check speaker resistance and cone for
damage.
Y
Replace speaker
Y
Digital TV Audio
Check video output
Follow procedure All source audio trouble
shooting guide
Y
Follow procedure digital TV video
trouble shooting guide.
N
N
Replace Mstar IC
- 23 -
Analog TV Audio
Check video output
Follow procedure All source audio trouble
shooting guide
Follow procedure analog TV video
trouble shooting guide
N
N
Replace Mstar IC
Y
Check SIF buffer signal
Check SIF Signal line.
N
Y
HDMI Audio
Check video output from sourcedevice.
Follow procedure All source audio trouble
shooting guide
Y
Follow procedure HDMI video trouble
shooting guide
N
N
Replace Mstar IC
Check EDID NVRAM (IC800, IC801, IC902)
Power & I2C Signal (#5, #6)
Replace it or re-download EDID data.
Y
N
- 24 -
BLOCK DIAGRAM
(Video Path)
Com
p1
(DVD/DTV)
Com
p2
(DVD/DTV)
YP
bPr_2
YP
bPr_1
AV
1
S-AV
1
AV
2
TU_
CV
BS
AV_1
AV_2
MSTAR
(From T
un
er)
RG
B
(PC/DTV)
RG
B
HDMI 1
HDMI 2
HDMI 1(TMDS)
TMDS
Sw
it
ch
TMDS
Sw
it
ch
HDMI 3
IF_P/N
S_
Video1
_Y/C
IC802
HDMI 2(TMDS)
HDMI 3(TMDS)
TMDS
IC903
Sw
it
ch
Sw
it
ch
YP
bPr
IC400
LG
D
T
3304
LG
D
T
3304
TP
(M
PEG Transport stream)
(From T
un
er)
IC100
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