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Green circuit board with VGA, audio, ethernet and USB ports

DELL

DELL Latitude E6420 I/O Board 157H2 UMA

SKU CH-MZZA-A9QJ7

Replacement I/O board for Dell Latitude E6420 laptops with integrated Intel UMA graphics

  • ProcessorLaptop-computer-replacement-parts
  • Genuine Dell OEM part for reliable repair
  • Restores VGA, audio, RJ-45 ethernet and one USB port
  • Designed exclusively for Latitude E6420 with integrated Intel UMA graphics
  • Matches Dell part number 157H2 for exact fit
  • Brand new component ready for installation

Genuine Dell OEM I/O Board for Latitude E6420 UMA

This replacement circuit board carries the 157H2 part number and is built for the Latitude E6420 laptop with integrated Intel graphics only. It restores VGA output, audio jacks, a single USB port and the RJ-45 ethernet connection when the original board fails. Installers must verify the UMA configuration before ordering because the discrete-graphics variant uses a different part.

Thermals noise and power draw

The board draws power directly from the motherboard and adds no active cooling of its own, so system thermals and fan noise remain unchanged after replacement. Power consumption is limited to the port controllers and passive components already accounted for in the laptop's original design. No external power adapter or additional wattage is required for operation.

What the bundled hardware changes

The package supplies only the bare circuit board shown in the product images, with no cables, brackets, screws or driver media included. Re-use of the existing retention hardware and ribbon cables is necessary to complete the repair. No software installation is required because the ports are natively supported by the laptop's chipset and operating system drivers.

How it compares

Measured against everything we stock in Motherboard Add-On Parts, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 80% of the 242 comparable items (median $50.49).

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Specifications

Product
Brand nameDELL
Processor
ProcessorLaptop-computer-replacement-parts

Questions about this item

How do I install the 157H2 I/O board into a Latitude E6420 and what step is often missed?

Remove the base cover, disconnect the motherboard cable, swap the board, then reconnect the cable; the step often missed is verifying the system uses integrated Intel video (UMA) before ordering.

What maintenance or replacement will the 157H2 I/O board need later?

The board itself has no scheduled maintenance; if the USB, VGA, audio or RJ-45 ports fail from wear, the entire I/O board must be replaced as a unit.

What limit appears first on the 157H2 I/O board during sustained heavy data transfer?

The single USB port and the RJ-45 ethernet port share the board's bandwidth, so sustained high-speed transfers will hit the port throughput ceiling before the board overheats.

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