Questions tagged [monitor]

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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)?
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1 answer
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Can i use a 19V 4A adapter for my 12V 4A control board? [duplicate]

I recently bought a control board for my lcd panel that needs 12 V, 4 A however the power adapter I have is 19 V 4 A. Would it blow the control board/lcd panel if i was to use the power adapter?
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2 votes
1 answer
40 views

How to monitor Ethernet packet loss real time on different connections?

For an embedded application we have a network with star topology, where we want to determine if there is packet loss for the different point-to-point (SMAC => DMAC) connections. We consider ...
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  • 529
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3 answers
115 views

What are the names of screens used in "Basic calculators"?

I was trying to power a basic calculator that day with a power source and I started from 0V going up to 1.5 v I noticed the calculator screen turning out to show a "0", but I could not do ...
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1 vote
0 answers
34 views

Converting mains powered monitor into DC

I have a DELL P2212H LED backlit monitor which runs on mains voltage. The power supply is internal. I need to run this from a 12V DC supply. The main transformer has 3 outputs which goes through 3 ...
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1 vote
3 answers
91 views

Barrel connector is too long for port

I had to buy an AC adapter for a monitor, but the one I purchased, while having the correct diameter for the plug, sticks out about a centimeter from the plug (picture below). This leaves part of the ...
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0 answers
32 views

LCD monitor SMPS to monitor motherboard connection

I opened a Dell monitor and found an SMPS board and motherboard inside. 4 LCD sensor cables are directly wired to the sensor pin of the PWM IC in the SMPS board. Multiple wires are connected from the ...
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  • 281
3 votes
1 answer
343 views

Why multiple series resistor on single phase metering reference design with HLW8012 and BL0937 IC

We need to implement energy monitoring in our smart plug. We are considering 2 ICs HLW8012 and BL0937 for this purpose and following are their reference designs in their data sheets. I am trying to ...
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8 votes
3 answers
879 views

Why did a spark occur between my HDMI cable and metal lamp base?

Edit: Update 1/2/22 @ 2:27 UTC: outlet tester shows that all outlets and power strip outlets being used were normal. Update 1/2/22 @ 21:07 UTC: performed various continuity tests which suggest to me ...
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  • 89
2 votes
2 answers
305 views

Single chip power good IC?

It seems like there should be a million chips for this, but for the life of me can't find any. I'm looking for a small (SOT23 or similar size if possible) IC that provides an active high when the ...
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2 votes
4 answers
243 views

Which components cause low humm and medium to high pitched buzz in this computer monitor? [closed]

I recently bought a ten year old 10-bit color fidelity computer monitor (NEC PA301W) that has brilliant display quality but to my sensitive ears has an audible/annoying low pitched humm noise along ...
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  • 505
1 vote
1 answer
94 views

Why does broken monitor have vertical lines [closed]

I unfortunately dropped a pointy object and it pierced a tiny area of my monitor (AOC U32E2N). I was surprised to see that the whole area of the impact (where physical damage can be seen) is ...
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0 answers
36 views

Semi-opaque red coloring spots on LCD, potentially dead pixels

I've been researching how LCD screens work on a technical level. One thing I had a hard time finding any detailed information about is failure modes and how to identify the cause of failures. Are ...
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1 vote
1 answer
177 views

DVI Hot Plug Detect

I am making a custom cable from a VPX backplane to a DVI-I connector, and need to know if the DVI cable will work ok with a standard monitor if I do not wire up the hot plug detect pin. I will never ...
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0 votes
1 answer
61 views

Monitor PSU troubleshooting (Monitor sometimes doesn't want to turn on) [closed]

My Packard Bell Viseo 223ws monitor sometimes doesn't power on. I'm guessing that it's a problem with the PSU since it sometimes works flawlessly but other times the power button doesn't even light up....
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2 answers
513 views

Multiple INA226 PCB for solar monitoring with a Raspberry Pi

For a project, I have a solar panel and a charge regulator with a 12V battery. The load is a Raspberry Pi. I want to monitor the voltages and the current flowing from the panel, the battery and to ...
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0 answers
182 views

Why does my USB-C PD trigger circuit not work in tandem with a DC-DC voltage step up module?

Good day internet humans, I am pretty new to the world of diy electonics, and am in the process of putting together a DIY portable computer monitor built from an lcd panel from an old laptop and a ...
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1 answer
36 views

Contact closure input

I am designing a test box with an enable switch that provides 0v disabled or 5v enabled to a digital input. I also want to have an external enable switch that allows an external contact closure input ...
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0 votes
1 answer
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Current from HDMI cable [closed]

I recently purchased a cheap monitor from amazon for using with my laptop. It has a HDMI and VGA output. I also have a speaker connected to my laptop. when I connect the HDMI cable to my laptop my ...
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6 votes
3 answers
1k views

Why do LCD screens need to refresh in the first place?

I understand how screens display something; essentially by refreshing very fast so that any changes are quickly visible. However, to me, this seems like a very inefficient way to solve the problem. ...
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0 votes
0 answers
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Monitor Activity USB , D+ and D-

I want to make a simple circuit to monitor if there is activity in a USB 'dongle'. Let's put an example, that I want to monitor if a 16GB usb dongle is working well (if it's not hung) It's seems ...
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1 vote
0 answers
120 views

Why is my PAC1934 voltage/current sensor showing lower voltage?

I'm testing out a PAC1934 click voltage/current meter and am getting weird results. The PAC1934 board is connected to an ESP32 development board, from which it gets 3V3 power and I2C control. There ...
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  • 181
0 votes
3 answers
315 views

How can you connect multiple monitors to one temperature sensor?

I have two monitors I want to connect to one temperature sensor. I tried connecting the sensor wires in parallel but it only outputs error. Sometimes the power doesn't even turn on. I'm guessing the ...
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0 votes
1 answer
60 views

Monitor if TX+/- ethernet pins are sending data

I want to 'monitor' in a 'cheap way' if one device connected to Ethernet(100M-BaseT) is 'sending' packets or not. I only need a binary answer, I don't want to know the data that DUT transmits, only ...
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0 votes
1 answer
60 views

Separating power from data micro USB to HDMI

I have a camera which both draws power and sends its data through a battery pack to a custom monitor. The monitor also draws power as well as receives the camera data through the battery pack. (Both ...
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0 votes
0 answers
145 views

How to adjust picture geometry of a CRT TV?

I have a HD CRT TV (Silva Schneider 26 inch) which failed recently. So I took apart a working CRT TV (Philips L01-2E AA, 20 inch) and took its mainboard and connected it properly to the HD CRT tube. ...
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0 votes
0 answers
38 views

Arduino Leonardo and Limit Switch cuts serial monitor out for 5 seconds

I've been trying all afternoon to get this solved. I have an Arduino Leonardo and a limit switch connected as seen in the photos. I've been running simple code through to check whether or not the ...
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2 votes
1 answer
508 views

Are all pixels addressed simultaneously in one frame?

In computer screens, is every pixel turned on during one frame? How can you address millions of pixels at the same time? Or is it like in CRT where it is scanned left to right, top to bottom?
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0 answers
30 views

Correction factor for monitor based off orthogonal regression

I'm seeking some clarity about providing a correction factor for an instrument based off orthogonal regression. Currently I have a machine I built myself, co-located with a reference monitor recording ...
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0 votes
2 answers
66 views

How do I know if a power supply will work with my monitor? [closed]

I've got a monitor which takes 19V 2A (AOC I2381FH) that I've lost the power supply to. I've got a power supply which will fit which says it produces 12V 2.5A which sounds like it might work. Would I ...
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2 votes
1 answer
179 views

Non-rechargeable Battery Gauge circuit / Coulomb counter

I'm trying to find a cheap implementation/circuit to monitor the remaining capacity of a non-rechargeable battery to be specific Lithium thionyl chloride LiSOCI2 batteries. I am aware of TI and Maxim'...
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1 vote
1 answer
217 views

Need help identifying capacitor values from monitor PCB

I am trying to replace the SMD electrolytic capacitors from an LG E2442 but I am getting confused in regards to determining the correct values. I am trying to determine three different cspacitors ...
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0 votes
3 answers
89 views

How to control LCD monitor with micro controller?

I would like to control my PC monitor. After disassembly I found the control buttons are implemented like this (just more data line and buttons) I would like to control it (with ESP2866) With the ...
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0 votes
1 answer
180 views

Can I change 1000 uF, 16 V for 1000 uF, 10 V?

Few days ago my main monitor did not turned on. I opened it and discovered three capacitors, of 1000 uF/16 V each, in bad shape. Since all stores here in my town are closed due the quarentine, I'm ...
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0 votes
2 answers
688 views

LCD screen: can this problem be caused by the inverter?

I'm repairing a HP 530 laptop with bad screen image. The image does not flicker, the corruption pattern is static. If I connect an external monitor through the VGA port the image is fine, therefore I ...
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0 votes
2 answers
4k views

Routing power and HDMI signal into usb type-c for DIY computer monitor

I am starting a project to build a DIY monitor. I have a spare lcd panel (model # LP156WF6) taken out of a laptop. I plan on buying a controller board for it and building it into a homemade enclosure. ...
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0 votes
1 answer
534 views

Calculating Energy Consumption Using a Current Sensor and Voltage Sensor

I'm creating a PCBA that uses a hall-effect sensor to measure current and a transformer rectifier design to measure the mains voltage. The voltage is 110-240 V, ~60 Hz. I wrote a digital filter and ...
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0 votes
2 answers
576 views

HP 1740 monitor stay on 2-3 seconds, turn off and repeat

I have an HP 1740 monitor that, when I turn it on, just remains 2-3 seconds to display and turns off completely (even the pilot). It seems to me that the problem is not in the backlight. I opened the ...
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0 votes
2 answers
177 views

Old monitor’s internal power supply works only when heated from the outside...fixable?

I have this old LG Flatron w1934s that worked fine until it‘s power indicator led started flashing, and after a long while the monitor turned then on, if I heated the monitor’s back with something ...
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0 votes
1 answer
5k views

How do I configure the wires in the LVDS 30 pin cable?

I explain: I have a screen that I want to use as a monitor. I have purchased an LCD controller board and a LVDS cable I need someone to help me to rewire the LVDS cable. I have the input terminal pin ...
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0 votes
2 answers
2k views

Spoofing or hiding monitor serial number

A MAC address of a computer can be spoofed by an FPGA which can be programmed as a network controller. I can set a custom MAC address to it. I turn off the motherboard's network interface controller ...
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0 votes
1 answer
38 views

monitor tp4056 charge current on a scope

I assembled a li-on charger with the TP4056 module as I've repaired a few solar lights for friends and a lot of the times the batteries are just low. Recently I purchased an Oscilloscope to use with ...
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1 vote
0 answers
91 views

Noise generated by monitor from Word document

I was zooming in and out of Word documents of only text and noticed that a noise was produced. The noise increased in pitch as I zoomed out and decreased as I zoomed in. I tried changing the font ...
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0 votes
2 answers
782 views

Trick monitor into receiving signal [duplicate]

I have the plan to convert a few old LED backlit monitors into false windows. While I theoretically could buy direct LED drivers to power these panels, I'd prefer to keep the existing circuitry, since ...
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2 votes
1 answer
309 views

How does Mains Isolation work with the ACS71020 IC?

In the datasheed for the ACS71020 IC, it shows the typical application of the device in which current is passed through the chip and voltage is measured on the opposite side. I do not understand how ...
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3 votes
1 answer
298 views

ESD Mats failing with constant monitoring system

At my job we have constant monitoring systems with ESD wrist straps attached to ESD mats. The way they are supposed to work is when the ESD wrist strap is attached, if the connection with the skin is ...
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0 votes
0 answers
63 views

Splitting a power supply to two monitors

I'm working on a project that requires 2 (identical) LED monitors, each of which has a separate power supply that outputs 19V 1.3A. To save space, I would like to instead use a single power supply ...
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0 votes
2 answers
637 views

How to connect a 3 phase 240V machine on a 415V supply

I have a challenge in connecting a 240 V 3 phase 9kw machine to a three phase 415V supply in Uganda. The machine is from South Korea. The phase monitor trips. Below is the brief precaution ...
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0 votes
2 answers
160 views

Is there equalizer on the monitor's HD-SDI interface

Is there usually an equalizer on the monitor's HD-SDI input interface? In fact is it an requirement for HD-SDI monitors? Maybe HD-SDI signal is attenuated too much at the input of monitor, but ...
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  • 105
0 votes
1 answer
23 views

Use different adapter for LG 25UM65-p [closed]

My LG monitor (25UM65-P) has original adapter (19V, 1.7Amp), can I use a different adapter (14V, 2.14Amp) for it? Has this any side effects or negative points?
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