LG L1933TR-SF Service Manual - Page 20

No Raster Osd Is Not Displayed - Mstar

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3. NO RASTER (OSD IS NOT DISPLAYED) - MSTAR NO RASTER (OSD IS NOT DISPLAYED) U201 NO PIN 16, 75 3.3V? YES U201 1 PIN96, 97 NO OSCILLATE AS 14.31MHZ? YES CHECK U301 1. CHECK C210, C211 SOLDERING CONDITION 2. CHECK X201 3. TROUBLE IN U201 U201 PIN27 IS 48KHz H-SYNC? 2 PIN28 IS 60Hz V-SYNC? NO IS PULSE APPEARED AT SIGNAL PINS? AT MODE 12? YES TROUBLE IN CABLE OR LCD MODULE CHECK CONNECTION LINE FROM D-SUB TO U201 Waveforms 1 U201-#96, 97 2 U201-#27 H-SYNC 2 U201-#28 V-SYNC Copyright 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 20 - LGE Internal Use Only

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- 20 -
Copyright
2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR
NO RASTER
(OSD IS NOT DISPLAYED)
NO
NO
NO
TROUBLE IN CABLE
OR LCD MODULE
CHECK U301
1. CHECK C210, C211
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U201
CHECK CONNECTION
LINE FROM D-SUB
TO
U201
U201
PIN96, 97
OSCILLATE AS
14.31MHZ?
U201
PIN27 IS 48KHz H-SYNC?
PIN28 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
1
2
1
2
Waveforms
U201-#96, 97
U201-#27 H-SYNC
2
U201-#28 V-SYNC
YES
YES
YES
U201
PIN 16, 75
3.3V?