LG 47LB7RF (CHASSIS:LP7AA) Service Manual ▷ View online
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TROUBLESHOOTING
1. No Raster - LCD
(1) Symptom
1) Does’t minute discharge at module.
2) It maintains the condition where the front LED is normal.
(2) Check follow
Is the Inverter
On or Off
Check the Power board.
Off
No
Is the
inverter 24V on power
board normal
No
No
No
No
Is output
the normality Low/High
voltage except
stand-by 5V?
No
'Inverter_On'
Signal is High of 5
th
pin in
P1001 on
Main board
Yes
On
Yes
Is the link cable
normal?
1. Check the Inverter connector
2. Check the LCD Module
Yes
1. Check the Main Board.
1. Reconnect the link cable in
P1301
No
1. Check the Main board
1. Change the Power Board
1. Change the Main Board
Yes
Is the Power Board
normal?
Yes
Is the VSC Board
normal?
Is the P1301's output
normal?
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Is the LVDS cable
normal?
Is the VSC Board
normal?
IC800' operation
is normal?
Is the Ctrl Board of
Module normal?
Is the LVDS cable
connected well?
Replace cable.
Replace VSC B/D
No
No
Yes
Replace Ctrl Board in Plasma panel
No
Replace LCD Module
No
Yes
Yes
Is the LCD Module
normal?
Yes
Plasma
LCD TV
No
Cable inserts well.
No
Replace FIL8668 IC(IC800).
2. In case of occur strange screen into specific mode
2-1. In case of doesn’t display the OSD
(1) Symptom
1) LED is White
2) The minute discharge work continuously
(2) Check follow
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2-2. In the case of doesn't work normally at specific input mode
(1) Symptom
1) The screen doesn't work normally at specific input mode (RF, AV, Component, RGB, HDMI)
(2) Check follow
1) Check the all input model if all input display normally.
2) Check the PIP and Double Window if it display normally.(Re-Check it Swap)
(3) In case of unusual situation from RF mode
Is the Tuner normal?
No
Yes
Yes
Cable inserts well.
Replace Tuner
Replace IC611
Is the Tuner Cable
connected well?
No
Is the Input voltage,
IIC Communication and
HV sync normal?
No
No
Is normal the
Input voltage, IIC
Communication and CVBS
output?
No
No
Is the IC611
normal?
Replace IC800
No
Is the Input voltage,
IIC Communication and
HV sync normal?
No
Is the IC800
normal?
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(4) When set doesn’t display normally at RF , AV mode
(5) When set doesn't display nromally at Component, RGB mode
(6) In the case of becomes unusual display from HDMI mode
Yes
Replace IC1200
No
Is the Input voltage,
IIC Communication and
HV sync normal?
No
Is the IC1200
normal?
Replace IC800
No
Is the Input voltage,
IIC Communication and
HV sync normal?
No
Is the IC800
normal?
Replace IC800
No
Is the Input voltage,
IIC Communication and
HV sync normal?
No
Is the IC800
normal?
Yes
Replace IC611
No
Is the Input voltage,
IIC Communication and
HV sync normal?
No
Is the IC611
normal?
Replace IC800
No
Is the Input voltage,
IIC Communication and
HV sync normal?
No
Is the IC800
normal?
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