LG 42PT81, Руководство по обслуживанию

Страница: 17 / 53

- 17 - LGE Internal Use Only Copyright©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. Protect mode
(1) Symptom
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.
(2) Follow check
Is the PSU normal ?
Replace 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
is operate correctly?
Yes
No
No
Is the Y-Board
normal?
Is the appropriate
fuse (FS2,FS3) on the
Y-B/D?
Is the output voltage
normal after removing
the P1 connector of
the Y-B/D?
Yes
No
No
Replace the Z-Board.
Is the Z-Board
normal?
Is appropriate
fuse (FS1,FS2) on
the Z-B/D?
Is the output voltage
normal after removing
the P1 connector of
the Z-B/D?
Yes
No
No
Is the X- Board
normal?
Is the
output voltage normal
after removing the P100, 110,
200, 210 connector of
the X-B/D?
After removing the P100, 110 and the output
voltage is normal : Replace the Right X-B/D
After removing the P200, 210 and the output
voltage is normal : Replace the Left X-B/D
No
Yes
Replace the fuse.
Yes
Start Check