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Green rectangular circuit board with USB port and SD card slot

DELL

DELL Latitude 3550 USB SD Card Reader IO Circuit Board 1H4KD

SKU CH-YYAJ-90VZW

Replacement I/O board adding a USB port and SD card reader slot for Latitude 3550 laptops

  • CPU Typelaptop-computer-replacement-parts
  • Genuine Dell replacement restores USB and SD card functions on Latitude 3550
  • Matches DPN 1H4KD and ZAL50/51/60/61 for direct compatibility
  • New OEM circuit board installs inside the chassis for a factory fit
  • Single part replaces both the USB port and SD card reader slot
  • Designed specifically for Dell Latitude 3550 notebooks

Dell Latitude 3550 IO Board Replacement

This replacement IO circuit board restores the USB port and SD card reader functions on a Dell Latitude 3550 laptop. It is intended for technicians or owners repairing a damaged or non-functional original board. The part carries Dell part number 1H4KD and matches alternate references ZAL50, ZAL51, ZAL60, ZAL61 and LS-B071P.

Capacity and Headroom

The board provides one USB port and one SD card slot connected to the motherboard via the original interface. It handles standard peripheral connections and memory card access exactly as the factory component did. The part does not add extra ports, change supported card formats or increase data throughput beyond the laptop's original specification.

What the Bundled Accessories Change

No cables, screws, drivers or software are included with this circuit board. Installation requires reusing existing fasteners and ribbon connectors from the laptop chassis. The component is a direct hardware swap; no firmware updates or configuration utilities are supplied or required for operation.

Highlights

  • Genuine Dell replacement restores USB and SD card functions on Latitude 3550
  • Matches DPN 1H4KD and ZAL50/51/60/61 for direct compatibility
  • New OEM circuit board installs inside the chassis for a factory fit
  • Single part replaces both the USB port and SD card reader slot
  • Designed specifically for Dell Latitude 3550 notebooks

Specifications

BrandDELL
CPU Typelaptop-computer-replacement-parts

Questions about this item

Will the 1H4KD IO board fit alongside the existing motherboard in my Latitude 3550?

The 1H4KD is designed specifically for the Latitude 3550 chassis and connects directly to its motherboard, so it installs inside the same housing without modification.

How can I verify the SD card reader on the 1H4KD board is working after installation?

Insert a known-good SD card; if it appears in File Explorer or Disk Management and you can read and write files, the reader on the 1H4KD board is functioning.

Does the 1H4KD board come with the USB port bracket or the connecting ribbon cable?

The 1H4KD is the bare circuit board only; any mounting bracket, screws or ribbon cable must be sourced separately or reused from the original assembly.

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