Apple Multiple Scan 14 Display Troubleshooting Guide
Fault-finding on the Apple Multiple Scan 14 Display from Apple's Service Source. Apple treated the display as a sealed unit: every chart ends at "return monitor to Apple", and there are no internal procedures.[1] The checks below are the ones that need no tools. Anyone opening the case should read CRT Discharge Procedure first.
Symptom charts
[edit | edit source]| Symptom | Cures, in order |
|---|---|
| No raster, LED off | Check the power cord; check the monitor cable and tighten its thumbscrews at the monitor port; replace the power cord; return the monitor to Apple |
| No raster, LED on | Adjust brightness and contrast; check the monitor cable and its thumbscrews; if the cable is connected but the power LED is yellow, the computer may need a video card (see the user's guide); return the monitor to Apple |
| Raster too short, tall, narrow or wide | Adjust vertical and horizontal size; choose another resolution in the Monitors control panel; return the monitor to Apple |
| Raster not centred | Check for environmental distortion by moving and turning the monitor; adjust the vertical and horizontal shift controls; return the monitor to Apple |
| Screen dark or dim | Adjust brightness; Energy Saver may be active, so move the mouse or press a key; return the monitor to Apple |
| Screen flickers | Move the monitor away from interference; keep monitors on the same computer at least 16 inches apart; return the monitor to Apple |
| No colour | Check the colour setting and number of colours in the Monitors control panel; return the monitor to Apple |
| Screen greenish or unreadable | Check the monitor cable: plug it into the video card port if a card is fitted, otherwise into the built-in monitor port; return the monitor to Apple |
| At 832 × 624 the picture is off centre, has no raster, flickers or is distorted | Some models do not support 832 × 624 (see below); select 800 × 600 or 640 × 480 in the Monitors control panel |
The 832 × 624 issue
[edit | edit source]Early displays shift the picture right at 832 × 624, and model M3935LL/A does not support that resolution. Apple's November 1995 programme replaced qualifying units with a Revision B display, depending on the computer in use; the eligibility table is on Apple Multiple Scan 14 Display#The 832 × 624 problem.[2]
Things that are not faults
[edit | edit source]- A dark screen after a period of inactivity is Energy Saver, not a failure.[1]
- Apple's chart says that a yellow power LED with the cable properly connected can mean the computer needs a video card.[1]
Related pages
[edit | edit source]References
[edit | edit source]- ↑ 1.0 1.1 1.2 Apple Computer, Apple Multiple Scan 14 Display (Service Source), Troubleshooting, General and Symptom Charts, pp. 1-5 (PDF pp. 22-26). Hosted here: File:Multiple scan 14 display.pdf (see Apple Multiple Scan 14 Service Source).
- ↑ Apple Multiple Scan 14 Display Service Source, Basics, Repair Issues: 832x624 Resolution, pp. 3-8 (PDF pp. 5-10).