LG 42PM1M-UC (CHASSIS:RF-052C) Service Manual ▷ View online
- 17 -
TROUBLE SHOOTING GUIDE
3. Protect Mode
(1) Symptom
¯
After once shining, it does not discharge minutely
from module
¯
The Rely falls(The sound is audible “click”)
¯
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
No
Is the Ctrl Board
normal?
Replace
X-Board.
Is the output voltage normal after
remove P1, 2, 4, 9, 10 connector of
Ctrl-B/D?
Yes
No
Yes
Is the Y-Board
normal?
Is the output voltage
normal after remove
normal after remove
P5, P6 connector of
Y-B/D?
Is the Fuse(FS2) 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
P1 connector of Z-
B/D?
Is the Fuse (FS1, FS2) 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 P1, 2, 3, 4, 5 connector of
X-B/D?
After remove P1, P2, P3 output voltage
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace Left X-B/D
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace Left X-B/D
Yes
No
Yes
Is the
VSC Board normal?
Is the output voltage normal after
remove P1001, P1100?
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, 1100 normal
operation: Replace VSC Board
operation: Replace VSC Board
Yes
No
Is the COF of X, Y, Z
normal ?
No
Yes
Yes
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TROUBLE SHOOTING GUIDE
4. No Raster
(1) Symptom
¯
Does’t minute discharge at module.
¯
It maintains the condition where the front LED is green.
(2) Check following
Is the Power Board
normal?
Replace the
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
No
Is the
Ctrl Board normal?
Replace
X-Board.
Is the output voltage normal after
remove P1, 2, 4, 9, 10 connector of
Ctrl-B/D?
Yes
No
Yes
Is the Y-Board
normal?
Is the output voltage
normal after remove
normal after remove
P5, P6 connector of
Y-B/D?
Is the Fuse(FS2) normal on Y-B/D?
(In case of open is replace)
Yes
No
Yes
Yes
Replace
Z-Board.
Is the
Z- Board normal?
Is normal the output
voltage after remove
P1 connector of
Z-B/D?
Is the Fuse(FS1, FS2) normal on
Z-B/D? (In case of open is replace)
Yes
No
Yes
Is the
X- Board normal?
Is the output voltage normal after
remove P1, 2, 3, 4, 5 connector of
X-B/D?
After remove P1, P2, P3 output voltage
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace the Left X-B/D
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace the Left X-B/D
Yes
No
Yes
Is the
VSC Board normal?
Is the output voltage normal after
remove P1001, P1100?
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, P1100 normal
operation: Replace the VSC Board
operation: Replace the VSC Board
Yes
No
Is the COF of X, Y, Z
normal?
No
Yes
Yes
- 19 -
TROUBLE SHOOTING GUIDE
5. In case of occurring strange screen into specific mode
5-1. In case the OSD does not displayed
(1) Symptom
¯
LED is green
¯
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 well?
Cable inserts well.
Yes
No
No
Yes
Does the FIL8532 IC
(IC800) Operates ?
Replace FIL8532
IC(IC800).
No
Is the Ctrl Board of
Module normal?
Replace Ctrl B/D.
No
No
Yes
Replace VSC B/D
Replace the cable.
Yes
- 20 -
TROUBLE SHOOTING GUIDE
5-2. In case of does’t display the screen into specific mode
(1) Symptom
¯
The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check following
¯
Check the all input mode should become normality display.
¯
Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
normality display from the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of becomes unusual display from RF mode
(4) In the case of becomes unusual display from RF, AV mode
(5) In the case of becomes unusual display from Component, RGB mode
Is the Tuner normal?
Is the CXA2069Q
normal?
Is the Tuner Cable
connected well?
Cable inserts well.
Yes
No
No
Yes
Is the FIL8532
normal?
Replace the Tuner
No
Is the Input voltage, IIC Communication
and CVBS output normal?
Yes
Is the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC
No
Is the CXA2069Q
normal?
Yes
Is the FIL8532
normal?
Is the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC
No
Is the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC
No
Is the FIL8532
normal?
Is the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC
No
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