37LG5500 (CHASSIS:LD82D) - LG TV Service Manual (repair manual). Page 17

C

2008

- 17 -

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 is red from green.

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

Yes

Is normal the Ctrl

Board?

Replace 

X-Board.

Is normal the output voltage after

remove P1, 2, 4, 9, 10 connector of

Ctrl-B/D?

Yes

No

Yes

Is normal the Y-

Board?

Is normal the output

voltage after remove

P103 connector of Y-

B/D?

Is normal the Fuse(FS101,FS102) 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, 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

Yes

No

Yes

Is normal the VSC

Board?

Is normal the output voltage after

remove P900, P901 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.

After remove P900, P901 normal operation: 
Replace VSC Board

Yes

No

Is normal the COF of

X,Y,Z?

No

Yes

Yes