Dell 2000FP Service Manual page 46

Dell 2000FP LCD Monitor Service Guide
This troubleshooting applies to the 2 cases:
1. The LED of the AC adaptor does not turn on.
2. The power LED of the monitor does not turn on normally after the power key is pressed.
Step Check item
1 Detach the AC adaptor from the monitor
and see if the LED of the AC adaptor
turns on normally.
2 The power cord is good.
3 Connect the AC adaptor to the monitor
and see if the adaptor's LED is on.
4 Check if control board and the power
key is OK.
5 Detach wire cables at CON106,
CON107 and CON108.
Press power key again and see if the
power LED on the monitor turns on.
6 See if the LCM is good.
7 See if the inverter is good.
No video troubleshooting
Normal operation
A splash screen shows up when the power key is pressed and the monitor turns on. The display is either
normal when appropriate signal is connected or there will be pop-up messages indicating 'Check Signal Cable',
'In Power Save Mode' or 'Cannot Display This Video Mode'.
Troubleshooting scope
This troubleshooting applies to the case that the power LED on the monitor turns on normally after the power
key is pressed but there is no splash screen showing up and no display is showing.
Step Check item
1 Remove all the signal cables and the
adaptor cable. Plug in the adaptor cable
again. Press the power key and the
power LED turns on green.
2 A splash screen shows up.
3 Check if interfacing cables at CON106,
CON107 and CON108 are OK and well
connected to LCM and interver.
4 Replace an inverter and see if it works
5 Replace an LCM and see if it works
6 Check display port output at PW171.
check if sync signals are normal and
stable at RP126.
7 Check if TMDS signals at CON107 are
good
8 Check if PLL part at IC114 is working
normally
Yes
The AC adaptor is good.
Go to step 3.
Replace the AC adaptor.
Step 4
Step 5
Step 6
Step 7
Contact ACM.
Yes
Step 2
LCM is good.
Go to port-specific trouble
shooting by checking which
input LED turns on.
Step 4
Inverter damaged
LCM damaged
U1 and IC114 PLL circuit are
good
Go to step 7
Contact ACM
Contact ACM
2
Confidential
Trouble Shooting
No
Step 2
Replace the power cord.
Step 5
Keys not working
troubleshooting
There is short circuit
somewhere in the interface
board.
Replace the LCM.
Replace the inverter.
No
Power not good trouble
shooting
Step 3
Fix the cables.
Step 5
Step 6
Step 8
Check IC110 and replace it if
needed
Replace Y104 if needed
Note
Note