LG 42PG20D-AA (CHASSIS:PA81A) Service Manual ▷ View online
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3. Protect Mode
(1) Symptom
1) After once shining, it does not discharge minutely
from module.
2) The Rely falls.(The sound is audible “click”)
3) It is converted with the color where the front LED
3) It is converted with the color where the front LED
is red from green.
(2) Check following
Is the Power Board
normal ?
Replace Power
Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No
No
Is the each connector
normal?
Replace the
connector.
Replace
Y-Board.
After connecting well each connector,
the normality it operates?
Yes
No
Yes
Is the Ctrl Board
normal?
Replace the Ctrl-Board.
Is the output voltage normal after
remove P163 connector of Ctrl-B/D?
Yes
No
Yes
Is the Y-Board
normal?
Is the output voltage
normal after remove
normal after remove
P209 connector of
Y-B/D?
Is the Fuse(FS201) on Y-B/D
normal?(In case of open is replace)
Yes
No
Yes
Yes
Replace
Z-Board.
Is the Z-Board
normal?
Is the output voltage
normal after remove
normal after remove
P3 connector of Z-
B/D?
Is the Fuse (FS1) on Z-B/D normal?
(In case of open is replace)
Yes
No
Yes
Is the X- Board
normal?
Is the output voltage normal after
remove P242 connector of
X-B/D?
After remove P211 output voltage normality:
Replace Right X-B/D
After remove P23 output voltage normality:
Replace Left X-B/D
Replace Right X-B/D
After remove P23 output voltage normality:
Replace Left X-B/D
Yes
No
Yes
Is the
VSC Board normal?
Is the output voltage normal after
remove P1001 of VSC Board?
After crisis COF of each board, check the normality operates.
If in case normality operates, correspondence COF Fail is replace the module.
If in case normality operates, correspondence COF Fail is replace the module.
After remove P1001 normal operation:
Replace VSC Board
Replace VSC Board
Yes
No
Is the COF of X, Y, Z
normal ?
No
Yes
Yes
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Does minute discharge
At Module?
Is the LVDC cable
normal?
Is the VAVS on?
Check the PDP Module
Yes
No
YES
Yes
Reconnect the LVDS
cable in P501
No
Is the IC700(FLI106X0H)
Output normal?
Replace the VSC.
No
NO
Replace the Power
board
Is output the normality
Low/High voltage except
stand-by 5V?
NO
4. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is green.
2) It maintains the condition where the front LED is green.
(2) Check following
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5. In case of occurring strange screen into specific mode
5-1. In case the OSD does not displayed
(1) Symptom
1) LED is green.
2) The minute discharged continuously becomes Accomplished from module.
2) The minute discharged continuously becomes Accomplished from module.
(2) Check following
Is the LVDS cable
normal ?
Is the VSC Board
normal?
Is the LVDS cable
connected?
Connect the LVDS cabel
with the VSC board.
Yes
No
No
Yes
Is the IC100(FLI106X0H)
normal?
Replace the
IC100(FLI106X0H)
No
Is the Ctrl Board of
Module normal?
Replace the Ctrl B/D.
No
No
Yes
Replace the VSC B/D
Replace the LVDS cable.
Yes
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5-2. In case of does’t display the screen into specific mode
(1) Symptom
1) The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input mode should become normality display.
(3) In case of becomes unusual display from RF mode
(4) In the case of becomes unusual display from side S-video/AV mod
Is the Tuner normal?
Is the RF cable connected with TV
Set?
Connect the RF cable.
Yes
No
No
Is the IC100(FLI106X0H)
normal?
Replace the Tuner.
No
Is the Input voltage, IIC Communication
and CVBS output normal?
Yes
Is the IIC communication waveform
between the tuner and IC100 normal?
No
Block A
Replace the
IC100(FLI106X0H).
No
Is the Video input of the AV
(JK105, JK106) normal?
Check the input source
No
Same as Block A
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