LG 42LG500H (CHASSIS:LA66A) Service Manual ▷ View online
- 21 -
(4) In the case of becomes unusual display from side S-video/AV mode
(5) In the case of becomes unusual display from Component, RGB mode
(6) In the case of becomes unusual display from HDMI mode
Is Video input of the AV
Jack (J504) normal?
Yes
Is normal the
FIL8662?
Check the input source.
• Is the source format supportable?
• Is the source device operate well?
• Is the cable connected well?
• Is the source format supportable?
• Is the source device operate well?
• Is the cable connected well?
No
Is normal the Input voltage, IIC
Communication and HV sync?
Communication and HV sync?
No
Replace Main board
No
Is R,G,B input and H,V
Sync of the (J503) normal?
Yes
Is normal the
FIL8662?
Check the input source.
• Is the source format supportable?
• Is the source device operate well?
• Is the cable connected well?
• Is the source format supportable?
• Is the source device operate well?
• Is the cable connected well?
No
Is normal the Input voltage, IIC
Communication and HV sync?
Communication and HV sync?
No
Replace Main board
No
Is output of the HDMI
Jack(J300 or J301) normal?
Yes
Is normal the
SIL9023/5(IC302)?
Check the input source.
• Is the source format supportable?
• Is the source device operate well?
• Is the cable connected well?
• Is the source format supportable?
• Is the source device operate well?
• Is the cable connected well?
No
Is normal the Input voltage, IIC
Communication and HV sync?
Communication and HV sync?
No
Replace IC
No
Yes
Is normal the
FIL8662?
Is normal the Input voltage, IIC
Communication and HV sync?
Communication and HV sync?
No
Replace Main board
No
- 22 -
4. In case of no sound
(1) Symptom
Ø
LED is blue
Ø
Screen display but sound is not output
(2) Check following
Is this problem occur
In some input (mode)?
Is the output signal of
The P100 normal?
Download the EDID data.
Only HDMI is No sound?
No
Yes
No
Cable inserts well.
Is the cable
connected Normal?
No
Yes
Cable inserts well.
No
Only RF is no sound?
Check the
Tuner IN/OUT
No
No
No
No
Is the cable
Connected Normal?
Is normal the IC1111
(MSP4450) Output?
Replace Main board
Replace IC.
Yes
Only AV/component/PC
input is no sound?
Yes
Yes
No
Is normal the IC1111
(MSP4450) Output?
Replace IC
Yes
Yes
Replace Main board
- 23 -
BLOCK DIAGRAM
1. Vide(After)
DIGIT_B_D[0-23]
H,V_SYNC_DIGIT
DE,CLK_DIGIT
TMDS_0
TMDS_1
DDC_I2C_0,1
ATSC/NTSC
Tuner
R,G,B
VGA_H,V SYNC
CABLE_DET
COMPONENT (Y,Pb,Pr)
REAR CVBS
SIDE_CVBS
S_VIDEO
Y,C(rear
/side)
TUNER_CVBS
I2S
D2A
INV_BR
DIGITAL_IN[24Bit]
DE,CLK_IN
DIGITAL_H,V_SYNC
ANALOG_IN
ANALOG_H,V_SYNC
ANALOG_IN
CABLE_DET
COMPONENT_SEL
ANALOG_IN
ANALOG_IN
ANALOG_IN
ANALOG_IN
ANALOG IN
INV_BRI
DISPLAY_EN
AI_ON_OFF/OD
SEL_1
LVDS_DATA
LVDS_DATA
DISPLAY_EN
INV_CTL
UART1
UART1
LVDS
Connector
For LCD
POWER
HDMI
SiI9023
ANT./Cable
Pro:Idiom
BCM7411
CPLD
12_to_20
DIGITAL_IN[24Bit]
DE,CLK_IN
DIGITAL_H,V_SYNC
SERIAL_TS
DIGIT_A_D[0-20]
H,V_SYNC_DIGIT
DE,CLK_DIGIT
Cortez-A.
UART0
UART0
CPLD
20 BIT
16 BIT
AFAGC_D2A,IFAGC_D2A
IF_P,IF_N
VSB
BLOCK
- 24 -
FR
O
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C
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2. Audio
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