LG StudioWorks 570LE Service Manual page 19

3. NO RASTER (OSD IS NOT DISPLAYED) – MX88L284
NO RASTER
(OSD IS NOT DISPLAYED)
U5
POWER PINS
3.3V?
YES
U5 PIN34, 35
OSCILLATE AS 14.3M?
YES
J5
PIN2 IS 65MHz CLOCK?
PIN4 IS 48KHz H-SYNC?
PIN5 IS 60Hz V-SYNC?
PIN37 IS 48KHz H-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
YES
570LE
570LS
J5 PIN40
NO
3.3V?
YES
TROUBLE IN CABLE
OR LCD MODULE
CHECK U12, U10
NO
NO
NO
IS APPEAR LOW
VOLTAGE SIGNAL
AT J4?
YES
J4 PIN4
5V?
YES
TROUBLE IN CABLE
OR LCD MODULE
- 18 -
CHECK U2, U24
1. CHECK PIN34, 35
SOLDERING CONDITION
2. CHECK X1
3. TROUBLE IN U5
CHECK U5'S SOLDERING
CONDITION AND
CHECK CONNECTION LINE
FROM U5 TO J5
CHECK SOLDERING
NO
STATE OF U16
NO
CHECK U12