Capacitor Reference - PowerBook 540c
The 540c shipped with 2 different display panels, one manufactured by Toshiba and the other by Sharp. The Toshiba panel only uses solid state capacitors, while the Sharp contains several electrolytics that should be replaced. The information below applies to Sharp panels only.
The display capacitors are frequently replaced with ceramic capacitors. These may work, but have been shown to result in drifting contrast on certain LCD displays. This is caused by ceramic capacitors' characteristic where the capacitance varies based on voltage load. As such, I would recommend replacing them with tantalum caps instead.
Reference Values
Logic Board
| Value | Count | Type |
|---|---|---|
| 100uf 25v | 1 | Surface-Mount Electrolytic |
LCD (Sharp LQ94D041)
| Value | Count | Type |
|---|---|---|
| 100uf 6v | 3 | Surface-Mount Electrolytic |
| 47uf 16v | 1 | Surface-Mount Electrolytic |
| 47uf 6v | 6 | Surface-Mount Electrolytic |
| 33uf 10v | 1 | Surface-Mount Electrolytic |
| 22uf 10v | 1 | Surface-Mount Electrolytic |
| 10uf 25v | 1 | Surface-Mount Electrolytic |
Backlight Inverter Board
The polymer caps very rarely fail - replace them only if you want to.
| Value | Count | Type |
|---|---|---|
| 220uf 6.3v | 1 | Low Profile Radial Electrolytic |
| 22uf 6.3v | 1 | Low Profile Radial Polymer |
| 6.8uf 25v | 2 | Low Profile Radial Polymer |
Reference Images
Click on an image to view the full-size version of it.
Logic Board
Photo courtesy of AEChadwick.
LCD (Sharp)
Photo courtesy of jmacz
Inverter
Page last updated (MM/DD/YYYY): 09/21/2024
Update Reason: new reference added
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