LG 50PZ750-UG (CHASSIS:PU12A) Service Manual ▷ View online
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Check Signal (JK802 #3)
Check SPDIF signal (R803)
Replace BCM35230 (IC101)
Y
N
OPTIC Audio Out Trouble Shooting
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Y
Replace JK802
< SPDIF waveform – sample >
- Defend on the input signal.
- Defend on the input signal.
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AV1,2 L/R
COMP 1,2 L/R
Side HDMI 1/2/3/4
CVBS waveform
IF waveform
STA368
(Digital AMP)
Reset
I2S
LGE35230
MCLK
HDMI CEC
IR
CVBS
Buffer
SIF
Buffer
RS-232C
I2C
CVBS(ATV)
NTSC/ATSC
TUNER
X-tal
(54MHz)
NAND Flash
(8GB)
DDR3 (2GB)
TDVJ-H101F
24C16
24C16
Local
Local
KEY
KEY
MAIN IF
DP/DM
DP/DM
NEC
NEC
Micom
Micom
COMP1
COMP2
Y/Cb/Cr
Y/Cb/Cr
R/G/B
RGB-PC
Rear AV
CVBS
Side AV
CVBS
L/R
L/R
RGB-PC
Audio In
SIF
Audio
Front
End
Video
Front
End
TMDS/DDC
HDMI
RX
I2C
HD/SD
Video
Encoder
Audio
DSP
SPDIF Out
UART
RX/TX
UART
UART
USB 2.0
RMII
RMII
DDC
SIF
SII9287B
HDMI SW
LAN
LAN
3DF_ASIC
LG8300
3DF_ASIC
LG8300
DDR2
(256Mbit)
X-tal
(25MHz)
Serial_Flash
(2Mbit)
LVDS 2Ch
Left (2D):
1920x1080/60Hz
LVDS
(
8
0
Pin
)
LVDS 2Ch
Right(2D) :
1920x1080/60Hz
USB Trouble Shooting
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USB Trouble Shooting
Check USB 2.0 Cable for damage or open
conductors
Check P1200,P1201
Y
N
Replace P1200,P1201
Check IC1200/1 voltage level 5V
(L1200/L12010)
Replace IC 1200 ,IC1201
Y
N
Replace BCM35230 (IC101)
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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USB Trouble Shooting
Check USB 2.0 Cable for damage or open
conductors
Check P1200,P1201
Y
N
Replace P1200,P1201
Check IC1200/1 voltage level 5V
(L1200/L12010)
Replace IC 1200 ,IC1201
Y
N
Replace BCM35230 (IC101)
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)
39/39