LG 26LH1DCX-UX / 26LH1DC3-UA / 26LH1DC4-UB / 26LH1DC5-UC Service Manual ▷ View online
-25-
2. No Screen(2)
Symptom
Front LED is blinking as green color, and no picture.
Check Flow
Check LVDS Cable?
Is the LVDS cable connected well?
Reset Cable
Replace LVDS Cable
Is LED, D102 lighted?
Check the Main Board
Check Key Pad/IR Input?
Replace Key Pad or IR Input
Check Power Supply
YES
YES
YES
YES
NO
NO
NO
NO
3. No Power
Symptom
Front LED is OFF, and no picture.
Check Flow
Power cord connected?
Plug in Power cord.
Replace Fuse(T5.0A H 250V)
Is the Power Board connected to
each control Board?
When ST-BY 12V/5V does not operate,
replace Power Board.
Connect cable
YES
YES
YES
NO
Is Fuse(F101) on Power Board good?
NO
NO
-26-
4. No Sound
Symptom
Front LED is ON as green color, but no sound.
Check Flow
Check Speaker Cable?
Is the SPK cable connected well?
Reset Cable
Replace Speaker Cable
Audio Voltage +12V normal?
Audio normal on HDMI?
Check Power Supply
Audio normal on DIGITAL RF?
Check EDID EEPROM
Audio normal on Analog RF?
Check MSP3425
Audio normal on Video3?
Check TEA6422D
Audio normal on DIGITAL RF?
Check TUNER
Audio normal on
AutoCamport/AV2
Check RJP Mode
Check TEA6422D
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
Check STA323W
NO
NO
NO
NO
NO
NO
-27-
BLOCK DIAGRAM
MPI
NETWORK
NETWORK
CATV
NETWORK
NETWORK
VIDEO IN
Auto camport
RX/TX
Audio R/L
FRAM
24MHz
RX/TX
RGB
LVDS Out
SPDIF
Caption
Optical
IR/Key
8MHz
24.576MHz
24Bit
MPEG2 TS
CVBS
Y/C
IR IN
26" (1366 X 768)
Flash
EEPROM
Service Port
RS232 Port
Switch
C-BOX
Update Key
Speaker
AUX CONTROL
MPI
CARD
+5V
REGULATOR
MPU
(MC9S12W128CFU)
DATA
SELECTOR
DDR
K4H561638
IR-LED
DRIVER
RS232C
DRIVER
DRIVER
7.3728 MHz
RJP
INTERFACE
ST12V
ST12V
12VA
12V ST12V ST5V
24V
I C
2
I C
2
I C
2
I C
2
Remote Jack Pack
SPEAKER OUT
SPEAKER OUT
IC708
STA323W
IC401
ZR39660
IC708
STA323W
IC401
ZR39660
IC705
M37151
IC705
M37151
IC302
RTD2023B
IC201
MST9883
IC302
RTD2023B
IC201
MST9883
IC707
BA7657
IC707
BA7657
Decryption
Block
Decryption
Block
IC105
TDVS-H062P
IC105
TDVS-H062P
IC602
MSP3425
IC602
MSP3425
HDMI
RGB
Component
x 2
ANTENNA
CABLE
CVBS x 2
Audio In
x 5
AC IN
100~240VAC 50/60Hz
CVBS
SIF
S-Video
18.432MHz
IC706
74VHC4051
IC601
TEA6422
IC706
74VHC4051
IC601
TEA6422
Built-in Power Supply
• Model : 26LH1DCX-UX
-28-
AC
IN
100~240V
LINE
FIL
TER
MAIN
CONTR
OL
(IC802)
PSU
PWR ON/OFF
(Q803)
ST
AND-BY
CONTR
OL
(IC900)
OPT
O
COUPLER
(IC807)
A
CTIVE HIGH
+24V/4.5A
+12V/2.5A
ST +12V/1.25A
ST +5V/0.1A
PWR-CTL
A+12V/2.0A
ST
AND-BY
TRANS
(T901)
MAIN
TRANS
(T801)
RECTIFIER
(SCHO
TTKY)
RECTIFIER
(SCHO
TTKY)
5V REGULA
T
O
R
(U201)
FEED
BA
CK
(IC804)
FEED
BA
CK
(IC902)
BRIDGE
(BD801)
PFC
(IC801)
DC +400V
•
POWER SUPPL
Y
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