60PF95-ZA (CHASSIS:PD75A) - LG TV Service Manual (repair manual). Page 14

- 14 -

1) After lighting up once, it does not discharge 

minutely from module.

2) The rely falls.(there is an audible “click”) 
3) The color of the front LED turns from green to red.

Is the Power Board

normal ?

Replace the Power Board.

Is the output Low/High voltage normal

except for Stand-by 5V?

Yes

No

No

Is the each connector

normal?

Replace the connector.

Replace the 

Y-Board.

After connecting each connector do

they operate normally? 

Yes

No

Yes

Is the Ctrl Board

normal?

Replace the 

X-Board.

Is the output voltage normal after

removing P1, 2, 4, 9, 10 connectors of

the Ctrl-B/D?

Yes

No

Yes

Is the Y-Board

normal?

Is the output voltage

normal after removing

P103 connector of 

Y-B/D?

Is the appropriate Fuse(FS101,FS102)

on the Y-B/D normal?(Replace if open)

Yes

No

Yes

Yes

Replace the 

Z-Board.

Is the Z-Board

normal?

Is the output voltage

normal after removing

P1 connector of

Z-B/D?

Is the appropriate Fuse (FS1, FS2) on

Z-B/D? (replace if open)

Yes

No

Yes

Is the X- Board

normal?

Is the output voltage normal after

removing P1, 2, 3, 4, 5 connectors of

the X-B/D?

If the output voltage is normal after removing
the P1, P2, P3 : Replace the right X-B/D
If the output voltage is normal after removing
the P4, P5 : Replace the left X-B/D

Yes

No

Yes

Is the 

VSC Board normal?

Is the output voltage normal after

removing P900, P901 of VSC Board?

After a COF crisis for each board, check the normal operation. For normal operation,
corresponding COF failure means the module should be relaced.

If it operates normally after removing the
P900, P901 : Replace the VSC Board

Yes

No

Is the COF of X, Y, Z

normal ?

No

Yes

Yes