Apple studio display 15 lcd adc User Manual

4 - Studio Display 15” LCD ( ADC)   Troubleshooting
Symptom Charts
Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the 
product. Because cures are listed on the charts in the order of most likely solution, try the cures in the 
order presented. Verify whether or not the product continues to exhibit the symptom. If the symptom 
persists, try the next cure. 
Note:  If you have replaced a module, reinstall the...

Studio Display 15” LCD ( ADC)  - 5
No Power Symptom Charts
No Power
1. Check J4 (see graphic below) input voltage. Do you measure +28V? I f yes, go on to the next step. If no, 
make sure the ADC (Apple Display Cable) cable is securely connected. Disconnect the display cable and 
check for bent pins on the display cable connector. Look for and carefully straighten any bent pins. Check 
for bent pins on the video card, straighten any bent pins. Also, verify that you have a known good video 
card in the...

6 - Studio Display 15” LCD ( ADC)   Troubleshooting
Symptom Charts
No Video
Dark Screen
1. Connect the display to a working computer. Shine a bright light onto the LCD to see if a faint image is 
visible. If the backlighting system is not functioning (and for some reason there is no diagnostic code 
on the LED) then the bright light should reveal a faint image of the desktop (or whatever is being 
displayed at the time). Do you see a faint image? If yes, replace the backlight bulb(s). If you don’t see a...

Studio Display 15” LCD ( ADC)  - 7
No Video Symptom Charts
Partially Dim Screen 
1. Plug the display into a known-good computer with a known-good video card and ADC display port. Boot 
the computer.
2. The Studio Display 15 will flash a repeating error code on the power LED if it detects a backlight fault. 
The error code consists of two short flashes followed by a long flash, a pause, and then the error 
repeats. When this error condition occurs, the problem could be bad bulbs, disconnected cable, or a bad...

8 - Studio Display 15” LCD ( ADC)   Troubleshooting
Symptom Charts
Touch Switch Not Working
1. Check if the touch switch is disabled (refer to Kbase article 58813).
2. Check the ADC cable. Replace/repair the ADC cable. Check the video card and ADC connector for 
damage (bent pins).
3. Check the touch switches. The touch switches could be faulty (rare) or the touch switch cable(s) are 
disconnected. Check the cables and touch switch and replace as needed. Usually if only one touch 
switch is bad it’s...

Studio Display 15” LCD ( ADC)  - 9
USB Devices Connected to Display Hub Not Work-
USB Devices Connected to Display Hub Not Working
1. Test the USB ports. Connect another USB device to one of the display’s USB ports. Use the Apple 
System Profiler to determine if the display’s hub and the display are visible.
2. Does Apple System Profiler see the USB device you connected? If the hub shows up, but the attached 
USB devices don’t, check the USB cable and its connectors that attach to the main board. If the...

10 - Studio Display 15” LCD ( ADC)   Troubleshoot-
Symptom Charts
Pixel Anomalies
Note: Refer to KnowledgeBase article 22194 for the most current Pixel Anomaly information and 
specifications. 
Article 22194 defines the term “pixel anomaly”, explains why such anomalies occur, and describes what to 
do if you feel your active matrix LCD panel has more than an acceptable number of pixel anomalies. 

Studio Display 15” LCD ( ADC)  - 11
Pixel Anomalies Symptom Charts 

© 2002 Apple Computer, Inc. All rights reserved.
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Apple Studio Display 15 LDC (ADC) 

Apple Studio Display 15 LCD (ADC) Views
 
Exploded View
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128
67
5
Foot Assembly
922-5621
Cover, Back
922-5623
Cover, Inner, Back
922-5624
Shield, EMI, LCD
922-5625
Hinge Assembly
922-5633
Chassis, Metal Frame
922-5628
Clip, Vertical
922-5631
Clip, Horizontal
922-5630 Cable Main, ADC
922-5635
Touch Switch
922-5636
922-5591, Rev.2
Display, LCD, 15
661-2780
Bezel, Front, 15
922-5590 Cover, Hinge
922-5622
Cover, USB Trim Ring
922-5627
Rear Panel Clip
922-5626
Clip,...