LG 32LX3DC-UA32 / LX3DCS-UA (CHASSIS:AL-04CA) Service Manual ▷ View online
- 17 -
No Raster
Replace Power board
Stand by voltage :
D_board P810 +12V-P
Check No Power
(Go to Power)
Fail
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Replace IC480/Q411
Replace D_board
Stand by voltage :
D_board IC480
#5, #6, #7, #8 12V
D_Board P412
LVDS Signal Exist?
Check No Power
(Go to Power)
Fail
Fail
Fail
Fail
Replace D_board
Replace A_board
A_board P817 #13
15V
Check No Power
(Go to Power)
Check
Module T-con voltage:
D-board P412 #2, #3, #4pin
12V?
Replace LCD Module
- 18 -
No Sound
Replace Connector
Replace Power Board
Replace A_Board
Replace Speaker
Check Sound supply:
A_board P817 #1, #2 18V
Power board 15Pin
Connector
check
Fail
Fail
Fail
Pass
Pass
Pass
Speaker output check :
Is there waveform of P601 #1?
BLOCK DIAGRAM(LCD Built-In)
- 19 -
BLOCK DIAGRAM DESCRIPTION(MAIN)
- 20 -
ATSC/NTSC tuner (TDVB-001P) can receive both terrestrial analog and terrestrial digital signals.
But a NTSC tuner (6700NFNS06C) can receive terrestrial analog only. Therefore if you run two displays at
thesame time, it is not possible to see two digital channels.
A/V SW (CXA2069) is the IC that takes external input terminal signals and broadcast signals from the tuners and
handles them selectively. Audio signals are sent to MSP4450. Video signals are sent to HD-II via two paths -
VPX3226E on the upper side is used to handle sub displays, while VPX3225E on the lower side controls the main
display.
To the lower side, signals are sent using an expensive 3D-comb filter with Y/C divided.
The video decoder (VPX3226E) is a chip that decodes input signals.
HD-II is a chip that controls nearly all video-related functions, including brightness, sharpness, video formatting and
scaling. If digital broadcasting is available, it comes through TP, which can be controlled from HD-II.
Video SW (CXA2181) is an IC that outputs video signals selectively. The selected one is outputted through ADC
(AD9883A) as a digital signal. uCom (M306H3) interfaces with the main CPU and primarily plays the role of
controlling power supply, remote controller and timers. Thus, while the set is turned off, it sends time information to
uCom for management.
TMDS Tx (Sil169) is the display stage that sends video data to the display medium according to the TMDS
protocol, and the TMSD receiver accepts it and outputs display.
CPU (S3C440BX) is the central processing IC, which controls most of the ICs.
Decryption FPGA(Cyclone EP1C12F256C8) can decrypt the encrypted TP(Digital Tuner stream) to normal TP(non
encrypted stream).
But a NTSC tuner (6700NFNS06C) can receive terrestrial analog only. Therefore if you run two displays at
thesame time, it is not possible to see two digital channels.
A/V SW (CXA2069) is the IC that takes external input terminal signals and broadcast signals from the tuners and
handles them selectively. Audio signals are sent to MSP4450. Video signals are sent to HD-II via two paths -
VPX3226E on the upper side is used to handle sub displays, while VPX3225E on the lower side controls the main
display.
To the lower side, signals are sent using an expensive 3D-comb filter with Y/C divided.
The video decoder (VPX3226E) is a chip that decodes input signals.
HD-II is a chip that controls nearly all video-related functions, including brightness, sharpness, video formatting and
scaling. If digital broadcasting is available, it comes through TP, which can be controlled from HD-II.
Video SW (CXA2181) is an IC that outputs video signals selectively. The selected one is outputted through ADC
(AD9883A) as a digital signal. uCom (M306H3) interfaces with the main CPU and primarily plays the role of
controlling power supply, remote controller and timers. Thus, while the set is turned off, it sends time information to
uCom for management.
TMDS Tx (Sil169) is the display stage that sends video data to the display medium according to the TMDS
protocol, and the TMSD receiver accepts it and outputs display.
CPU (S3C440BX) is the central processing IC, which controls most of the ICs.
Decryption FPGA(Cyclone EP1C12F256C8) can decrypt the encrypted TP(Digital Tuner stream) to normal TP(non
encrypted stream).
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