LG RT-42PX10/H Service Manual page 22

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 follow
Is normal the Power
Board?
Yes
Is normal the each
connector?
Yes
Is normal the
Y- Board?
Yes
Is normal the
Z- Board?
Yes
Is normal the
X- Board?
Yes
Is normal the
Ctrl Board?
Yes
Is normal the
VSC Board?
Yes
Is normal the
COF of X, Y, Z?
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No
Is output the normality Low/High
voltage except Stand-by 5V?
No
After connecting well each connector,
the normality it operates?
No
Is normal the Fuse(F52) on Y-B/D?
(In case of open is replace)
No
Is normal the Fuse(FS1, FS2) on Z-
B/D? (In case of open is replace)
Is normal the output voltage after
No
remove P1, 2, 3, 4, 6, 7 connector of
X-B/D?
Is normal the output voltage after
No
remove P1, 2, 101, 300, 701, 702
connector of Ctrl-B/D?
No
Is normal the output voltage after
remove P1000, P1200?
No
After crisis COF of each board, check the normality operates.
If in case normality operates, correspondence COF Fail is
replace the module.
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No
Replace Power
Board.
No
Replace
connector.
Is normal the output
Yes
voltage after remove
P5, P6 connector of
Y-B/D?
Is normal the output
Yes
voltage after remove
P1 connector of
Z-B/D?
After remove P1, P2, P3, P4 output voltage
Yes
normality: Replace Right X-B/D
After remove P6, P7 output voltage
normality: Replace Left X-B/D
Yes
Replace
X-Board.
After remove P1000 normal operation:
Yes
Replace Analog Board
After remove P1200 normal operation:
Replace Digital Board
Yes
Replace
Y-Board.
Yes
Replace
Z-Board.