LG 60PM4M-WA (CHASSIS:PM75A) Service Manual ▷ View online
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TROUBLE SHOOTING GUIDE
4. In case of an unusual display in VIDEO(AV,S-VIDEO)
(1) Procedure check
Check the
input Jack(JK506,
JK514)
Check the Signal Cable
And Output Device
And Output Device
Yes
No
Check the
Video Switch IC Output
(CXA2040AQ)
Yes
Check A Block
Reconnect the link cable in
P803
P803
Change the IC(IC513)
No
1. Check the IC101
2. Check the Vcc of IC101
3. Check the Peripherals of
2. Check the Vcc of IC101
3. Check the Peripherals of
IC101
No Raster State
On Video Signal(AV/S-VHS)
Yes
Is the normal
video output of XA2040AQ?
(Check the R669, in case of
S-Video check R672,
R682)
Is the I2C communication
normal?
Is the Input voltage
normal?
No
Check the
Video Switch IC Output
(CXA2040AQ)
Check the power
Re-insert the Cable.
Change the IC(IC513)
No
No
No
No
YES
YES
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TROUBLE SHOOTING GUIDE
5. In case of an unusual display in RGB
(1) Procedure check
Check the
input Jack(P503)
Check the Signal Cable
And Output Device
And Output Device
Yes
No
Check the Schmitt triger
I/O SYNC(IC507)
Yes
Check the Vcc and
Peripherals of IC507
Peripherals of IC507
No
1. Check the IC101
2. Check the Vcc of IC101
3. Check the Peripherals of IC101
2. Check the Vcc of IC101
3. Check the Peripherals of IC101
No Raster State On
RGB Signal
6. In case of an unusual display in Component1,2
(1) Procedure check
Check the
input Jack(JK510,
JK511,JK512)
Check the Signal Cable
And Output Device
And Output Device
Yes
No
1. Check the IC101
2. Check the Vcc of IC101
3. Check the Peripherals of IC101
2. Check the Vcc of IC101
3. Check the Peripherals of IC101
No Raster State On
Component Signal
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TROUBLE SHOOTING GUIDE
15. HDMI mode
Is only video
normal?
Is only audio
normal?
No
Yes
Download EDID data each port.
Check the TMDS line wave.
(R312~E3273)
(R312~E3273)
1. Check the HDMI receiver’s status register. (0x60, offset 0x06)
- If the value is 0xf or 0x8, it is normal.
2. Check the HDCP register. (0x60, offset 0x06)
- Enable bit 6 : HDCP key loaded
- Enable bit 5 : HDCP decryption active
- Enable bit 4 : HDCP authentication attempted
- Enable bit 5 : HDCP decryption active
- Enable bit 4 : HDCP authentication attempted
Reset TMDS power down/ on register.
- 0x60, offset 0x3f : 0xf7 => 0xff
- 0x60, offset 0x3f : 0xf7 => 0xff
Check HDMI source.
Change to another source or cable.
Change to another source or cable.
Yes
Is the wave
continuous?
Normal video,
Normal audio?
No
Yes
Replace the IC508.
No
1. Unplug and plug in the HDMI cable.
(sometimes ESD surge occurred at HDMI port.)
2. Check the HDMI Mute register. (0x68, offset 0x37)
3. Check the Audio-out channel mute register (0x68,
3. Check the Audio-out channel mute register (0x68,
offset 0x32) is appropriately enabled.
Yes
- 20 -
BLOCK DIAGRAM
ANX9021
(HDMI
RX
’er
)
RXC
–
/RX0
–
RX1
–
/RX2
–
FLI8662
(Cortez Advanced)
NTP2000
(Digital Audio Processor)
TAS5122
(D-CLASS AMP)
NJU26901
(Audio Delay)
LC FILTER
OUT1A
OUT1B
OUT2A
OUT2B
MSP4440K
(Audio Processor)
AT49BV160
(Flash Memory)
HY5DU281622ETP
(DDR SDRAM)
HY5DU281622ETP
(DDR SDRAM)
CXA2040AQ
(Video Switch)
LA7217M
(Video Sync
Seperator
)
74HC14D
(Schmitt Trigger
Inverter)
CM2021
(ESD
Protector)
ICL3232C
(RS232C)
AD8009
(OP AMP)
PC R/G/B
PC H/V SYNC
PC R/G/B OUT
PC H/V SYNC OUT
PC H/V SYNC
IR&LED Board
PDP Panel
KEY1 / KEY2
PREAMP IR
WIRE CONTROL
RXD / TXD
RXC
–
/RX0
–
RX1
–
/RX2
–
24 bit
SYNC_DE
V / Y_OUT
C_OUT
I2S
Delayed I2S
Y/C
CVBS
CVBS OUT
AV Audio IN
Component Audio IN
PC Audio IN
AV Audio OUT
Component 1,2 Y
Pb Pr
WIRE
CONTROL
RS-232C IN / OUT
HDMI
PC RGB IN / OUT
Component 1, 2 IN
PC Audio
Component 1, 2
Audio IN
CVBS
IN / OUT
CVBS Audio
IN / OUT
S-Video
27MHz
19.6608MHz
18.432MHz
500KHz
KEY CONTROL B
’D
VIDEO PATH
AUDIO PATH
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