32PC5RVH-MF (CHASSIS:PP78C) - LG TV Service Manual (repair manual). Page 14

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1) After lighting once it does not discharge minutely from the module. 
2) The relay 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 the normal Low/High

voltage except for the Stand-by 5V?

Yes

No

No

Are all the connectors

normal?

Replace the connector.

Replace the fuse.

Replace the Y-Board.

After checking each connector 

does it operate correctly?

Yes

No

No

Is the Y-Board

normal?

Is the 

appropriate fuse 

(FS2, FS1) on the 

Y-B/D?

Is the output voltage normal

after removing the P1

connector of the Y-B/D?

Yes

No

No

Is the X- Board

normal?

Is the 

output voltage normal 

after removing the  P11, P12,

P13 connector of

the X-B/D?

After removing the P12 and the output
voltage is normal : Replace the Right X-B/D
After removing the P11, P13 and the output
voltage is normal : Replace the Left X-B/D

No

Yes