Dell Latitude C840
The Latitude C840 is a Pentium 4M-based 15-inch business laptop that was released in March 2002. The C840 was the successor to the Pentium III-based C810, with its new features including Pentium 4M processors, faster graphics, DDR memory, and an IPS display option. It remained on sale until some time between August and October 2003.
The C840 was also sold with altered styling as the Inspiron 8200.
Specifications
| Spec | Details |
|---|---|
| CPU | CPU Type: Socket 478 (Northwood-M) Intel Pentium 4M @1.8, 2.0, or 2.2GHz |
| Chipset | Intel 845MP |
| RAM | PC2100 DDR, 2 slots Standard: Unknown Maximum: 2GB |
| Hard Disk | 2.5" IDE Uses proprietary adapter?: Yes Standard: 20, 30, 40, or 60GB |
| Display Options | - 15.0" TFT LCD @1400x1050 - 15.0" TFT LCD @1600x1200 - 15.0" IPS LCD @1600x1200 |
| Graphics Chipset | NVIDIA GeForce4 440 Go VRAM: 32 or 64MB |
| Audio | Crystal CS4205 |
| Main Battery | Lithium Ion (8 cell) |
| CMOS Battery | 6-cell Varta NiMH (1x6) |
| Power Supply | Latitude C-Series 3-pin - Dell PA-9 ONLY |
| Disk Drives | Fixed Optical Drive Latitude C-Series Modular Bay supporting the following: - Various CD & DVD drives - 3.5" 1.44MB Floppy Drive - ZIP Drive - 2nd HDD - 2nd Battery |
| PC Cards | 2x PCMCIA/CardBus Slots |
| Networking | - Modem - 10/100 Ethernet - WiFi (Optional) |
| Other I/O | - 1x Parallel - 1x Serial - 1x VGA Out - 1x PS/2 - 2x USB 1.x - 1x Dock Connector - 1x IEEE1394/FireWire - 1x S-Video Out - 1x Mic In - 1x Line In - 1x Headphone Out - Infrared |
| BIOS | Dell BIOS (Phoenix-based) |
| Pointing Device | Trackpad & TrackPoint |
Resources
 Drivers |
 User Manual |
 Service Manual |
 Schematic |
|---|
Common Faults & Maintenance
CMOS Battery Leaks
The C840's CMOS Battery is a 6-cell VARTA NiMH pack, located under the palmrest on the right side. This type of battery leaks nearly 100% of the time, and will easily cause damage to surrounding components if left unchecked. If you own a C840, remove this battery ASAP, and think carefully before buying one that doesn't work off eBay. This battery is a likely culprit. As of writing (in 2024), the C840 isn't quite old enough to have had most of them die from this battery, but if you're reading this 5 or more years from now, it's likely that a majority of unserviced units will be dead. The first parts to break will likely be the trackpad, as the battery in the C840 connects to the trackpad ribbon cable. If you see a C840 with a bad trackpad, keep this in mind!
Gallery
No images are currently available. If you own a C840, help the site out by sending some in!
Page last updated (MM/DD/YYYY): 11/03/2024
Update Reason: added schematic and additional info
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