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LG RD-JT40/41 Service Manual
27
1. Final Assembly Trouble Shooting Guide
Back-LIGHT OK?
No
STEP:
1.Check power core
2.Check power board and wire
Yes
System Trouble Shooting Flow Char
Power ON OK?
(LAMP ON?)
Yes
No
1.Check lamp door.
2.Check thermal switch and wire
3.Check 12V Fan and wire
4.Check power board and wire
5.Check color wheel FPC
6.Check screws on color wheel
7.Check color wheel motor
8.Check DMD driver board and 120 pins connector
9.Check Translation board and wire and 50 pins connector
10.Check Main board
11.Check AV Box connector (if with this option)
No Signal?
No
Yes
1.Check input cable
2.Check OSD source set up
Auto Power Off?
No
Yes
1.Check OSD lamp hours
2.Check OSD Auto Off setup value
3.Check lamp door
4.Check 12V fan
5.Check thermal status
6.Check AV Box connector(if with this option)
Video NG? Yes
No
1.Check AV Box
2.Check Video cable
Audio NG?
No
Yes
1.Check AV Box
2.Check audio cable
IR Remote Control
NG?
No
Yes
1.Check Remote module battery
2.Check Remote module
3.Check Translation board
4.Check Main board
Pixel Fail?
No
Yes
1.Check DMD chip
2.Check DMD board
Image NG?
(Raindrops)
No
Yes
1.Check color wheel and Sensor board
2.Check DMD chip and holder
3.Check DMD conductive elastomers assembling
4.Clean DMD conductive elastomers
A