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Questions tagged [hdmi]

HDMI (High-Definition Multimedia Interface) is a digital audio/video interface.

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Serial Port connected thru HDMI... Kinda works and now I have questions

I want to preface this with the fact that I don't know much on the hardware end of things. We have a device at work that requires a serial port connection to communicate with the software that ...
Ben Leatherman's user avatar
1 vote
2 answers
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Inline volume control for analog audio signals with push buttons [closed]

I want to build something to control the amplitude of analog audio signals between the source (line level analog audio output already extracted and decoded from an HDMI source) and the AMPs. In ...
Deling Ren's user avatar
2 votes
1 answer
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My HDMI cable is outputting constant current, is that normal?

I bought two cheap monitors in a local shop. They are basically the same model, and both came with an ungrounded external power supply. After getting a few shocks from the HDMI cable I realized it is ...
Ariel's user avatar
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Raspberry PI (CM4) video to USB-C DisplayPort alt mode

I'm working on a project where I aim to utilize a USB-C port to embed both video signals and USB functionality. USB-C's "Alt Modes" offer potential solutions, namely DisplayPort (DP) Alt ...
nowox's user avatar
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TFP401PZP: Unable to get proper video output, ghost screen/distorted pixels

I have designed my own display driver board using a TI TFP401PZP TMDS DVI receiver/deserializer which is connected to a 24-bit, parallel RGB, 7 inch capacitive touch display with a resolution of ...
Aryan's user avatar
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HDMI cable CEC not present

I have a question regarding HDMI cables. I recently purchased a cable that does not have the CEC pins connected with each other. However there are certain devices that use that pin and other cables ...
VicTic's user avatar
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1 answer
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Can I run PoE++ on DisplayPort/HDMI over Cat6?

I'm working on a project for an industrial application where I need to run a monitor with a single cable carrying both data and power. 7" LCD with a few Watts backlight, 1024x600@30fps or so, ...
Mitcham Tuell's user avatar
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Can an HDMI receiver device recover after TDMS lines are cut-off for long period?

I'm trying to gauge the viability of making an HDMI multiplexer/demultiplexer for multiple lines. The main goal is to be able to switch various inputs to various outputs. This question in particular ...
TrisT's user avatar
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Radiated Emissions problem

This is regarding some Radiated Emissions testing unintentional radiator. We did a pre-scan of our product and we got the following EMI signature. Critical frequency is at 314.986 MHz Polarization is ...
DRF's user avatar
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2 answers
155 views

HDMI output from FPGA

I've got an old project that produces NTSC video output from an FPGA using a resistor ladder DAC. It also produces a stereo audio signal using a similar RL DAC. I'd like to bring it into the modern ...
Gorilla Sapiens's user avatar
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HDMI Termination analysis

Recently came across one ULX FPGA board add-on. HDMI TMDS signals are terminating on this board. I am unable to understand why highlighted resistors are used for. Seems like some sort of voltage ...
Atharva Upadhye's user avatar
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HDMI termination board

We are trying to make one HDMI termination board. This board will plug-in into my motherboard and emulate 1080p display. I want to use this termination board for EMC chamber testing of the motherboard ...
Atharva Upadhye's user avatar
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159 views

Merging HDMI and USB to one cable

I have a project which includes a display which has a mini-HDMI input and a USB-output (D+ D- differential pair) for touch screen. How can I combine those two into one cable to talk to my MCU? I'm ...
Michael's user avatar
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Circuit Design For HDMI Shut Off

I am building a device that will turn on/off the HDMI to a monitor. This will allow a microcontroller to flip the monitor on and off. I tried a basic design that switches the 5V, DDC/CECGround, and ...
Joel Danowitz's user avatar
2 votes
1 answer
96 views

What is this HDMI connector?

I'm trying to identify this HDMI connector. The marking on it says TCF but I haven't found a manufacturer with that name or any other info based on that. I went through the Digikey, Mouser and Molex ...
Mich R's user avatar
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FPGA HDMI Video Lag tester doesn't display on FPV goggles

I've forked this video lag tester Verilog project, which is itself a port of the time-sleuth project to the GOWIN Tang 4K FPGA. My intention is to build something that can test the input lag on FPV ...
Kris Dover's user avatar
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What is needed for a 512Kb HDMI EDID EEPROM? (re: 512KB IC2 EEPROM) [closed]

I'm trying to build an HDMI "dummy" plug that simulates a plugged-in monitor (to trick GPUs into thinking a monitor is plugged in). Many of these "dummy" adapters exist and are ...
SofaKng's user avatar
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How can I confirm the presence of an HDMI signal with a slow scope?

Per the title, I'm trying to troubleshoot a circuit and confirm if a device is putting out an HDMI signal but I only have access to "slow" (<=200MHz) oscilloscopes. I don't need to know ...
John U's user avatar
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1 vote
2 answers
662 views

TV motherboard / LDVS and universal LED panel

On eBay you can find hundreds of Samsung (but also LG, Philips, etc.) Smart TV motherboards (see e.g. here https://www.ebay.com/itm/132373029756). What I would like is to have more of those ...
STeN's user avatar
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HDMI > eDP 1.2 converter

I have a spare 15.6 laptop screen and want to turn it into a small portable monitor. By portable I mean that it should not require to be plugged into an electric socket. The screen itself only needs 3....
Ivan Schemm's user avatar
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Audio noise/feedback through speakers from HDMI (DIY projector)

I have built a projector and it's mostly working except I'm having issues with speaker noise, I'm not an expert with this sort of thing at all so I'll try my best to explain. I have 12 V DC coming ...
peazy's user avatar
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1 vote
2 answers
374 views

HDMI CEC connections and ground reference

I'm trying to work with the HDMI-CEC bus and a STM32 microcontroller (currently on a Nucleo-144 board). I'm connecting a cut HDMI cable with some Dupont wires soldered on it, to interface to the ...
BDeliers's user avatar
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3 answers
2k views

MIPI DSI touch screen compatibility with Orange Pi 5B

TD;DR Is DSI and MIPI D-PHY TX 4 lane the same thing? I came across a "Waveshare 7.9 touch display for Raspberry Pi" which has two options, HDMI and DSI. As I can see from Orange Pi's ...
44yu5h's user avatar
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20-pin LVDS (DF14-20P) to USB/HDMI for post-processing?

I am looking to convert a 20-pin LVDS (DF14-20P) signal from a thermal imager to another format (i.e. HDMI) so that I can do post-processing on a Raspberry Pi, OAK-Som, or similar. Everything I can ...
Cajer's user avatar
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2 answers
1k views

What are HDMI pins 13, 14 and 17 actually defined?

According to wikipedia, HDMI pins 13, 14 and 17 are: 13: CEC. 14: Reserved (HDMI 1.0–1.3a), Utility/HEAC+ (HDMI 1.4+, optional, HDMI Ethernet Channel (HEC) and Audio Return Channel (ARC)). 17: Ground ...
jiandingzhe's user avatar
3 votes
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56 views

Which parameters should be compared to to replace N-MOSFETS with different package but with same pin functionality?

Since NTZD3154N is used a lot in my design, and I have BSS138PS only for used for one circuit, I want to replace BSS138PS with NTZD3154N in the following DP++ Auxiliary Conversion Block: Note: This ...
Firas Abd El Gani's user avatar
3 votes
1 answer
1k views

EDID emulation in HDMI and DisplayPort, is DisplayPort really more difficult?

I've been doing a lot research on EDID and HDMI and DisplayPort and I have a question about the relative difficulty of always-on EDID Emulation between the two specs. With HDMI, almost every Matrix ...
Evan Carroll's user avatar
2 votes
0 answers
66 views

HDMI: What is the maximum acceptable differential impedance variation and for which length

Imagine I have a HDMI bus with differential impedance 100 Ohm and length 10cm Imagine that for a segment of length "L" there is an impedance variation of "DELTA" Question: in order ...
grax's user avatar
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3 answers
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Could I use an RF modulator to broadcast signals from a Raspberry Pi to an analog tv over the air without the use of a coaxial cable?

"Long" story, but I connected a digital-to-analog converter (for OTA TV) to my mom's 1984 Samsung CRT, and now I'm wondering, could I broadcast (on low power, of course) HDMI outputs to a TV ...
William Hunter's user avatar
2 votes
1 answer
160 views

Cheap hack works, but I need a VGA cable plugged in [closed]

My laptop headphone jack died. I purchased an HDMI to VGA dongle with an audio out port and it works, but only when I have a VGA cable plugged into the dongle. Why? Can I short out two pins with a ...
Eric D's user avatar
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2 votes
1 answer
156 views

AMD R6000 CPU - DisplayPort dual-mode feature

In the past I have designed a platform that used an Intel Tiger Lake (Gen 11) CPU and now I have a new project that uses the AMD R6000 series. Different from Intel, the design of the DP++ feature ...
Firas Abd El Gani's user avatar
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2 answers
216 views

Is it possible to route DPs to HDMI from the HD3SS215 without using vias?

I'm working with the HD3SS215 and have found that while the datasheet does have a typical application for HDMI (9.2.2, p19), it is difficult to route to that connector from the IC; the pinout from the ...
Nick Bolton's user avatar
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1 answer
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Soldering solution for HDMI connector

I have an HDMI connector that is clamped to the PCB, we are still hand soldering this position but often bridge or deflection occurs. Can you give us any advice on how to auto solder this position?
Jonathan Chu UHAN's user avatar
-1 votes
1 answer
248 views

Is it safe to connect HDMI from a 110 V device with a 220 V device? [closed]

I have a PC powered by a 110 V outlet (220 V-110 V step-down transformer) and a monitor powered by a 220 V outlet. Would it be safe to output my display to the monitor via HDMI?
linker's user avatar
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Converting an HDMI signal into USB-A

I am working on a project which involves an active HDMI<-->USB-A converter. I may not be searching for the right thing, but I cannot find a circuit to perform this anywhere. I know it is ...
coresdev's user avatar
1 vote
0 answers
568 views

Repair HDMI HPD and EDID failure

This is a photo of an old video board from a Dell display showing "No Cable", and "No Signal" OSD messages but working correctly when video is force-enabled and EDID is supplied ...
Nikhil Saxena's user avatar
1 vote
0 answers
209 views

HDMI ground loop from gaming PC to AVR

I have a ground loop from my HDMI from gaming PC to AVR. It's very annoying. Aside from getting an expensive ground loop isolation transformer for 1000 W, is there any other way? Is there an HDMI ...
Nick Nickelson's user avatar
14 votes
2 answers
3k views

How does a HDMI source detect whether the sink is native HDMI or connected by a HDMI-DVI adapter?

Over the years of using HDMI monitors, I always had some trouble with the RGB color range, full (0-255) vs limited (16-235). The HDMI Spec v1.3a says, in section 6.6 (page 95, PDF page 111): Black ...
user3528438's user avatar
0 votes
1 answer
2k views

HDMI audio pin-out

I have two HDMI outputs, one of them has only video, the other only sound. What I want to do is combine two HDMI cables and get the video and sound at the same time with only one HDMI cable. But I am ...
sweetngx's user avatar
2 votes
1 answer
6k views

What is the correct behavior of the HDMI HPD signal?

Can anybody explain the correct behavior the HDMI HPD (Hot Plug Detect) signal? For example, I've disassembled an HDMI coupler and connected a few wires to the +5V/HPD/GND (shell) and here is what I'm ...
SofaKng's user avatar
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1 answer
484 views

What's wrong with level shifter output? [closed]

I was trying to understand what wrong about the output of the level shifter, the level shifter is part of my circuit that I trying to bring-up and encountered difficulty in this issue. This is the ...
Knowledge's user avatar
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0 answers
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HDMI debug issues over wireless

I have designed board that carrier transmitter HDMI module. There are TX side and RX side, the board works well except one issue that which takes a lot of sleepless days from me. this is the ...
Knowledge's user avatar
  • 443
0 votes
2 answers
282 views

HDMI: Can a computer still detect a monitor properly if some of the TDMS pins/wires are damaged? [closed]

Can a faulty HDMI-cable with damaged TDMS pins/wires still work to the extent that the computer can still detect the monitor, but the monitor just will not display anything (except for no signal)?
huoneusto's user avatar
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2 answers
243 views

What is is the maximum number of consecutive zeros/ones in a TMDS-encoded bitstream?

If I understand correctly, TMDS is similar to the 8b/10b encoding. A compliant 8b/10b encoder will not output more than five ones or zeros in a row, but does a similar property holds true for TMDS?
firegurafiku's user avatar
0 votes
1 answer
590 views

How can I fake HDMI signal? [closed]

Is it possible to build a circuit to send power to an hdmi-in port on a repurposed tv power/logic board to make the “unit/logic board” see it as a signal and not turn off? I’m making a video key light ...
Italy Omar Hart's user avatar
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0 answers
157 views

How can I drive an LP101WX2 LCD panel with the Chalkboard Electronics HDMI-dualLDVDS converter?

I am trying to drive an LP101WX2 panel with the Chalkboard Electronics HDMI-dualLDVDS converter but all I am getting is a black screen. I tried to flash the board's firmware with both the demo and the ...
user1969903's user avatar
0 votes
1 answer
119 views

HDMI connector power port

I am designing an HDMI switch with two inputs and one output. I found a multiplexer that can be used specifically for this purpose (HD3SS215) but it needs a 3.3 V power supply. Can I use the 5 V power ...
Leonardo Max Golušin's user avatar
3 votes
3 answers
1k views

Turn screen on/off with an N-channel MOSFET

I have a display monitor that is connected to a Raspberry Pi, all running off a battery. Most of the time the monitor is not used so I'd like to turn it on only when required, but I also would like it ...
php_nub_qq's user avatar
0 votes
1 answer
177 views

Minimum set of pins to block HDMI

I am trying to build a device to block HDMI signal (from receiver perspective, i.e. the TV) and I was wondering if there is a minimum number of pins (ideally one) that I can use to accomplish such a ...
Paperino's user avatar
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1 vote
1 answer
869 views

Looking for an explanation of grounding in relation to computers and DVI-HDMI adapters

I recently found that a DVI-HDMI adapter, purchased to connect the micro-HDMI port on my new Raspberry Pi 400 to the DVI port on my monitor, behaves strangely: it works well when connecting to my ATX ...
Theo d'Or's user avatar
  • 113

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