LG Flatron L1750S Service Manual page 18

NO RASTER
(OSD IS NOT DISPLAYED)
J705
1 PIN5, PIN 6
5V?
J705 PIN9
3 4
2.5V?
J705 PIN10
5V?
CHECK
PULSE AS
CONTACTING SCOPE
PROBE TO CAUTION LABEL.
(CONTACT PROBE TO
CAUTION LABEL.
CAN YOU SEE PULSE
AT YOUR
SCOPE?
REPLACE CCFL LAMP
IN THE LCD MODULE
Waveforms
1 J705-#5, 6 / U801-#1/U803-#3
2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS
YES
YES
YES
YES
3
J705-#9
Inverter Off
Micom Port check
J705 Inverter output
NO
NO
NO
NO
4
J705-#9
Inverter On
Micom Port check
J705 Inverter output
- 15 -
CHECK LIPS
CHECK MICOM INV
ON/OFF PORT.
(U501 PIN9)
1. CONFIRM BRIGHTNESS
OSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ
PORT(U501 PIN41)
LIPS