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LG RD-JT40/41 Service Manual
30
3. Main Board Trouble Shooting Guide
System no work
a . IC201 bad soldiering
b. Flash(IC201) without software inside.
c. IC607(Reset IC) function abnormal
d. IC901 no work.
a. Check IC609 (3.3V) or IC610(2.5V)
b. Check MCLK and DCLK
No data signal
output to DMD BD
The image display
"No Signal" when
the input is PC
The ghost Image
display output of
Video input
Couldn't download
new software to
MianBD
Remote mouse
don't work
Keypad working
abnormally
a. IC901 bad soldiering causing IC901 no work.
b. Check IC609(3.3V) or IC610(2.5V).
c. Check IC203, IC202 if there was MCLK and DCLK
output to IC901.
Yes
a.Check the mouse of PC is still working normally
b.Check the mouse driver of PC is PS2 compatible
mouse
c.Replace IC802
a. Replace IC602
b. IC901
a.CN605 bad soldiering
b.IC901 bad soldiering
c.Avbox and MainBD bad connection
a. Check the voltage of IC502, IC503(3.3V),
IC501(3.3V), BC537(3.3V)
b. if voltage above are OK, then check
IC611(VSYNC) and IC606(HSYNC) if there were
these two signal or not.
c. Replace IC502
Yes
Yes
Yes
Yes
Yes
Check IC613
Check the resisters between IC502 and IC901
(RP501 RP512)
a.Check soldiering condition of R692.
b.IC901 bad soldiering
Check IC612
LampLit signal
abnormal
IR doesn't work.
Gray bar abnormal or
image contour(PC input)
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No