Leading Edge LEP-95081SX/25
Leading Edge LEP-95081SX/25
| Preliminary Information | |
|---|---|
| Release Year | 1993 or 1994 |
| Leak Risk | High |
| Batteries | Removable Ni-Cd primary battery, internal lithium TL-5186 CMOS battery |
| Destructive Entry | No |
| Hardware Specifications | |
| CPU | Intel 80386SX @ 25 MHz |
| Memory Capacity | Up to 8MB |
| Memory Type | Proprietary expansion connector with 2MB on board. Uses GM71C4400ALJ or equivalent DRAM chips. |
| Storage | 2.5" IDE HDD, 3.5" Floppy |
| Graphics | Chips & Technologies F65520 VGA |
| Display Interface | Internal LCD and VGA |
| Sound | Piezo speaker |
| Power Requirements | |
| Input Voltage | 12V DC |
| Current (Amps) | 2A |
This is a low-end laptop made around 1993 or 1994. It features a monochrome passive matrix display and internal VGA graphics using a Chips & Technologies F65520. I/O ports include one each of PS/2, 25-pin parallel, 9-pin serial, 15-pin VGA, and an RJ-11 modem on some models.
Known Issues
Will not power on, power supply LED just flashing
Causes
- Shorted electrolytic capacitor in the internal DC-DC power supply causing the power supply crowbar circuit protection to activate.
Solutions
- Recap the DC-DC power supply.
Disassembly Notes
Disassembly is mostly straight forward with no hidden screws. Screws are all #0 Phillips except for the posts next to the I/O ports, which need to be removed as part of the disassembly.
Original Parts
Internal DC-DC power supply
| Qty | Capacitance | Voltage | Mount | Diameter/Size | Height | Lead Spacing | Temp | Type | Brand |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 330 µF | 16 | Through Hole | 8 mm | 12 mm | 4 mm | 85 °C | Electrolytic | Samsung |
| 2 | 1000 µF | 6.3 | Through Hole | 8 mm | 12.5 mm | 4 mm | 105 °C | Electrolytic | Samsung |
| 1 | 0.33 µF | 50 | Through Hole | 5 mm | 11 mm | 2 mm | 85 °C | Electrolytic | Samsung |
| 2 | 47 µF | 50 | Through Hole | 6 mm | 11 mm | 3 mm | 105 °C | Electrolytic | Samsung |
| 3 | 100 µF | 16 | Through Hole | 5 mm | 11.5 mm | 2 mm | 105 °C | Electrolytic | Samsung |
Note: tolerance for the diameter of the capacitors is tight on this circuit board, especially for the 1000 µF capacitors.