Read Sharp LL-T2000 (serv.man9) Service Manual online
LL-T2000A
3 – 1
Check using the following procedure.
LED comes on in green when power
switch is turned on?
switch is turned on?
No
See
<Error occurs when
synchronizing signal is detected>.
Yes
LED comes on in orange soon after
RGB cable is removed?
RGB cable is removed?
See
<Error occurs in power
save mode>.
See
<Backlght goes out abnormally>.
Screen is normally displayed in each
video mode?
video mode?
See
<Screen is abnormal>.
No error
This troubleshooting guide is written on the assumption that the signal input is UXGA @60 Hz, 64
gradation color input. If a different signal or display is inputted, the timing or waveform may be different.
gradation color input. If a different signal or display is inputted, the timing or waveform may be different.
<Error occurs when synchronizing signal is detected>
DC+12 V is outputted from AC adapter?
Check AC adapter.
Test terminal LD59 is DC+12 V?
Check DC+12 V power supply line and power
supply circuit around fuses (DC jack PWB).
supply circuit around fuses (DC jack PWB).
Test terminal LD64 is DC+3.3 V?
Check DC+3.3 V power supply line (DC33)
and power supply circuit around IC14.
and power supply circuit around IC14.
Test terminal LD65 is DC+5.0 V?
Check DC+5.0 V power supply line (DVCC,
AVCC) and power supply circuit around IC15.
AVCC) and power supply circuit around IC15.
Test terminal LD66 is DC+2.5 V?
Check DC+2.5 V power supply line (DV25)
and power supply circuit around IC16.
and power supply circuit around IC16.
IC26 2nd pin output is DC+3.3 V?
Check DC+5.0 V power supply line (AVCC)
and power supply circuit around IS26.
and power supply circuit around IS26.
The voltage at both ends of fuse F1 is
DC+12.0 V?
DC+12.0 V?
Check LCDPW signal, Q5 and areas
around it.
around it.
Test terminal LD58 changes in its level
when power switch is turned on and off?
when power switch is turned on and off?
Check MAINPW signal, CN4 and areas
around it.
around it.
IC9 8th pin (not mounted) signal is in
L level (DC+0V)?
L level (DC+0V)?
Check RESET circuit around IC21.
Test terminal LD46 signal input is normal?
Check clock circuit around IC11, IC25 X2.
Test terminal LD45 signal input is normal?
Check clock circuit around IC10, X1.
Test terminals LD2, LD3, LD9, LD10
signal inputs are normal?
signal inputs are normal?
Check RGB cable and CN1, CN2.
to be continued to next page.
CHAPTER 3. TROUBLE SHOOTING
Check whether the following cables are connected correctly.
In addition, check whether the PCs video mode is properly set to the signal timing which meets this machine.
In addition, check whether the PCs video mode is properly set to the signal timing which meets this machine.
Attached cables
* Dedicated AC adapter
* Dedicated signal cable (RGB cable)
* Dedicated AC adapter
* Dedicated signal cable (RGB cable)
Connect RGB cable again.
Backlight comes on?
Backlight comes on?
No
No
No
Yes
Yes
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Yes
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