Interactive Connector Diagram
Click or tap any pin in the diagram below to inspect its signal assignment, electrical specification, and wire colour standard.
Click any pin to view its signal assignment, electrical spec, and wire colour.
Supported Systems / Found On — Retro Machine Hubs
This connector is used on the following retro computer systems. Click any colour-coded badge below to open its full board-level repair, diagnostic, and schematic Machine Hub:
Connector Specifications
Differential Pairs
TMDS Data2 (Pins 1/3), Data1 (Pins 4/6), Data0 (Pins 7/9), Clock (Pins 10/12)
EDID I²C Bus
Pin 15 = SCL (Clock), Pin 16 = SDA (Data), Pin 17 = DDC/CEC Ground
Power & Handshake
Pin 18 = +5.0 V DC (50 mA min) | Pin 19 = Hot Plug Detect (HPD)
Full Pin Assignment & Wiring Reference
| Pin | Signal Name | Direction | Electrical Spec / Role | Wire Colour / SCART / Adapter Target |
|---|---|---|---|---|
| 1, 2, 3 | TMDS Data2+ (1), Shield (2), Data2- (3) | Out | TMDS Differential Channel 2 (Red) | Red Pair + Shield |
| 4, 5, 6 | TMDS Data1+ (4), Shield (5), Data1- (6) | Out | TMDS Differential Channel 1 (Green) | Green Pair + Shield |
| 7, 8, 9 | TMDS Data0+ (7), Shield (8), Data0- (9) | Out | TMDS Differential Channel 0 (Blue) | Blue Pair + Shield |
| 10, 11, 12 | TMDS Clock+ (10), Shield (11), Clock- (12) | Out | TMDS Differential Pixel Clock | Yellow Pair + Shield |
| 13 & 14 | CEC (13) & Utility/ARC (14) | I/O | Consumer Electronics Control (13) & Reserved/HEC/eARC (14) | Purple / Grey |
| 15 & 16 | DDC SCL (15) & SDA (16) | I/O | 5 V I²C EDID Display Identification Bus | Orange / White |
| 17 | DDC / CEC / HPD GND | GND | 0 V Ground Return for DDC, CEC and +5V | Black |
| 18 | +5.0V POWER | Pwr | +5.0 V DC Output from Source (powers TV EDID EEPROM) | Red (+5V) |
| 19 | HOT PLUG DETECT (HPD) | In | Returned from Display (via 1 kΩ from Pin 18) to signal TV connected | Pink / Brown |
Diagnosing Torn / Cracked HDMI Ports on Upscalers & Consoles
HDMI Type A uses 19 pins arranged in two interleaved rows (Odd Pins 1–19 on the top row, Even Pins 2–18 on the bottom inset row): three differential TMDS data pairs (Data0, Data1, Data2) + one TMDS clock pair carry video and audio, while Pins 15/16 carry the 5 V I²C EDID Display Data Channel (DDC).
- Missing Colour Channel or Green/Pink Tint: Check continuity on the four differential pairs (Pins 1/3, 4/6, 7/9, 10/12) and the ESD protection arrays right behind the HDMI socket.
- "No Signal" Despite Good TMDS Continuity: Check the tiny SMD Schottky diode and polyfuse feeding +5 V to Pin 18 — if that diode blows, the TV never asserts Pin 19 (Hot Plug Detect)!