No Raster (Power Led Blue, Black Screen) - LG 22LN4050 Service Manual

2. No raster (Power LED blue, black screen)

NO RASTER
(Screen is not displayed)
1
Is 19.4V at JK700?
2
Is 1.8V at L501?
Is 1.25V at L500?
3
Is 1.25V at 4pin of IC704?
Is 1.8V at 2pin of IC711?
4
is 3V at 3pin of IC801?
5
Put into LVDS cable completely?
LVDS cable have damage?
6
is 12V at 1pin of P101?
Insert the F/W back
or REPLACE LCD MODULE
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
YES
YES
YES
YES
YES
YES
check open or short at Line.
NO
Check Line short or open between
NO
If there is any problem at Line,
Change IC711/IC704 or change IC501
check open or short at Line and waf er
NO
between IC704,IC711 and IC600.
If there is any problem at Line,
Change IC704,IC711 or IC501
It is not over 3V at 1pin of IC801.
NO
Or check Line short or open between
If LVDS cable isn't insulted enough,
NO
Insult LVDS cable until locking hook.
If LVDS cable have damage,
If is not under 1.5V at R722,
change Q721 or check open and short
NO
of Line among Q720 and Q721.
Of line between L110 and P101.
- 14 -
or change Adapter
IC711/IC704 and IC501,
Change Q802.
R803 and 95pin of IC501.
Change IC 501.
Change LVDS cable
If is under 11V at L110,
Check open and short
LGE Internal Use Only