LG 24LP350H-TA (CHASSIS:LM91M / LM91T) Service Manual ▷ View online
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9. Abnormal sound (AV)-Main PCBA
Put into AV cable completely?
Abnormal sound (AV)
YES
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
Is waveform at C520,C521
2
Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
C520,C521(audio in)
2
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10. Abnormal sound (HDMI)-Main PCBA
Abnormal sound (HDMI)
Put into HDMI
cable completely?
YES
NO
NO
insulted HDMI cable
1
Change IC501
Is Input signal timing
and format in spec?
Change Timing according to
product spec, change format
under 8 bit in Ycbcr, Ypbpr, RGB
2
Is waveform at 10,12pin
of JK204?
3
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
NO
YES
YES
Is waveform at 1,3,4,6,7,9pin
Of JK204?
YES
4
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
NO
Can read EDID and
HDCP key though
16,15pin of JK204
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
YES
Is 5V at 19pin of JK204?
Check Line between JK204 and IC501
is open or short, Another is
Change IC501 or HDMI cable
5
YES
6
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19V
19V_am
p
DC/D
C
3.3V Stand by
5v_tuner
`
TMDS/HDMI RX
VIF De
-m
od
e
Decoder
saw filter
AD
C
Audio
processor
Scalar
Video
processor
LVDS
TX
Syste
m
EEPROM
EEPROM
EEPROM
AD
C
Speaker Amp(10W)
LCD
module
Flas
h
vide
o
AD
C
audio
saw filter
OSD/LUT
Crystal
IR
LE
D
Touch
SIF De
-m
od
e
LDO
2.5v_SDR
MC
U
64M SDRA
M
CVBS
D sub
HDMI
RF
3.3v_A
VC
C
1.1V_VCCK
1.25v_A
VD
D
LV
DS
1366X768 60hz
76Mh
z
24Mh
z
MT8223L
DC/D
C
DC/D
C
DC/D
C
LDO
Adapter
BJT
12v_module
LED driver (24”
)
Burst up(26”,22”
)
28V
24V
LC
Left
Right
LC
BLOCK DIAGRAM
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A2
A31
900
200
400
540
910
120
122
801
300
510
502
51
1
501
301
800
401
402
LV
1
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
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