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HDMI to VGA Converter

CVT-HDMI-VGA

Connects a laptop or receiver with HDMI to an older VGA screen or projector.

Type: Converter
Connectors: HDMI / VGA

In-depth technical details

HDMI Type-A carries 19 pins: TMDS pairs for the video/audio signal itself, plus control lines -- CEC (single remote controlling multiple devices), DDC/+5V (the EDID handshake that lets the source learn the display's supported resolutions), and HPD (Hot Plug Detect, how the source knows a display is actually connected). VGA (DE-15) carries 3 analog color signals (R/G/B), separate HSync/VSync timing lines, and a real DDC (I2C) channel on pins 12/15 -- the same 'source reads the display's real capabilities' concept as HDMI's DDC, just an older technology.

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End A

HDMI Type-A

01 19 pins Three differential TMDS pairs carry picture and sound, a fourth carries the clock, and the rest are named-function pins.
02 CEC A single wire that lets one remote control multiple connected devices, e.g. a TV and a receiver.
03 DDC / +5V The EDID handshake -- how the source learns which resolutions the display supports.
04 HPD Hot Plug Detect -- how the source knows a display is connected at all.
05 Metal shell The shell is grounded and wraps the pins, keeping interference out of a very high-frequency signal.
06 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
07 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

End B

VGA (HD-15)

01 15 pins Three analogue colour signals (red, green, blue) plus horizontal and vertical sync, each on its own pin.
02 DDC (I²C) The EDID handshake -- how the source learns which resolutions the display supports.
03 D-shaped shell The D profile only fits one way round, so the plug cannot be inserted upside-down and bend its pins.
04 Thumbscrews Hand-tightened to hold the plug home. A loose one is why a picture flickers, or loses one colour channel.
05 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
06 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

From the published standard

How it works

A converter between HDMI and VGA is not a passive adapter: one side is digital and the other analogue, so real electronics have to rebuild the signal. That makes it directional. An HDMI-to-VGA converter will not work in reverse no matter how well the connectors fit, and that is the single most common mistake with this category. HDMI also carries audio and VGA does not, so sound needs a separate path.

Conversion: Active — requires electronics, often USB power
Direction: One way only; check which side is the input
Audio: HDMI carries audio, VGA does not — it needs a separate path

This information comes from published sources about this type of product, not from the supplier.

en.wikipedia.org

Applications

Connecting a modern device to an older screen
Driving a meeting-room projector

Technical specifications

Type	Converter
Connectors	HDMI / VGA

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