MT-42PM13B (CHASSIS:RF-04GC) - LG TV Service Manual (repair manual). Page 22

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3. Protect Mode
(1) Symptom
Ø
After once shining, it does not discharge minutely 
from module
Ø
The Rely falls(The sound is audible “click”) 
Ø
It is converted with the color where the front LED 
is red from green. 
(2) Check follow
Is normal the Power
Board?
Replace Power
Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No
No
Is normal the each
connector?
Replace
connector.
Replace 
Y-Board.
After connecting well each connector,
the normality it operates? 
Yes
No
No
Is normal the 
Ctrl Board?
Replace 
X-Board.
Is normal the output voltage after
remove P1, 2, 101, 300, 701, 702
connector of Ctrl-B/D?
Yes
No
Yes
Is normal the 
Y- Board?
Is normal the output
voltage after remove
P5, P6 connector of
Y-B/D?
Is normal the Fuse(F52) on Y-B/D?
(In case of open is replace)
Yes
No
Yes
Yes
Replace 
Z-Board.
Is normal the 
Z- Board?
Is normal the output
voltage after remove
P1 connector of 
Z-B/D?
Is normal the Fuse(FS1, FS2) on Z-
B/D? (In case of open is replace)
Yes
No
Yes
Is normal the 
X- Board?
Is normal the output voltage after
remove P1, 2, 3, 4, 6, 7 connector of
X-B/D?
After remove P1, P2, P3, P4 output voltage
normality: Replace Right X-B/D
After remove P6, P7 output voltage
normality: Replace Left X-B/D
Yes
No
Yes
Is normal the 
VSC Board?
Is normal the output voltage after
remove P1000, P1200?
After crisis COF of each board, check the normality operates.
If in case normality operates, correspondence COF Fail is
replace the module.
After remove P1000 normal operation:
Replace Analog Board
After remove P1200 normal operation:
Replace Digital Board
Yes
No
Is normal the 
COF of X, Y, Z?
No
Yes
Yes

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