eSynic 2-Way HDMI Signal Splitter

HDMI Splitter
HDMI Splitter

Time for another random teardown, a signal splitter for HDMI. These units are available very cheap these days on eBay. This one splits the incoming signal into two to drive more than one display from the same signal source.

Main PCB
Main PCB

The stamped alloy casing comes apart easily with the removal of a few screws. The PCB inside is rather densely packed with components.

Chipset
Chipset

The main IC on the incoming signal is a Silicon Image Sil9187B HDMI Port Processor, with a single input & 4 outputs. In this case the chip is used as a repeater to amplify the incoming signal. the signal path then gets fed into a Pericom PI3HDMI412 HDMI Demux, which then splits the signal into two for the output ports.

Microcontroller
Microcontroller

The main pair of ICs processing the video signals are controlled over I²C, with this STM32 microcontroller. The 4 pads to the lower left are for the STLink programmer. The main 3.3v power rail is provided by the LM1117 linear regulator on the right.

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