Questions tagged [monitor]

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How to wire this into MOLEX

I've taken apart old LCD monitor and i would like to power the LCD panel from molex connector, on which i will cut one plastic connector and use the wires. Since molex has 5V gnd gnd and 12V it's ...
Andrej Rišian's user avatar
0 votes
5 answers
298 views

VGA cable wire pinout

I stripped this VGA cable. It only has 5 wires. One is just single copper strand. Is this normal? If so what would be the pinout?
Kalash Changal's user avatar
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1 answer
481 views

Can a CRT last 100,000 hours or even 300,000?

Online, I could find that high-quality cathode-ray-tube displays (whether be it for a computer monitor or a television set) have a design lifespan of 30,000-50,000 hours of cumulative operation. I ...
CoastCity Lapse 00crashtest's user avatar
0 votes
2 answers
123 views

Why is the power adapter external (not built in) to the monitor? [closed]

I am considering to tape this dangling box to the back of my PC monitor for easier manipulation - I carry the screen up and down every day. However, my intuition has raised a red flag. Perhaps there ...
Martin Drozdik's user avatar
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0 answers
83 views

Silver Coating on the front glass inside a crt

I recently disassembled a defective Macintosh SE. When taking apart the CRT (safely) to preserve the front glass panel to screw back in, i noticed a silver coating on the inside of said front glass ...
Wadafacc's user avatar
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0 answers
22 views

ISL28022 Maximum Ratings - Differential Voltage

I would like to use the Renesas ISL28022 Precision Digital Power Monitor to measure the current through a shunt resistor and I'm not sure I fully understand the datasheet. So the way I intend to use ...
Cez Chi's user avatar
  • 25
2 votes
1 answer
124 views

I have 2 LCD panels - I'm trying to find out what electronics I need to set them up

I have two LCD panels that I want to use, but they don't have any electronics, case or anything with them (I got them from a computer shop that was shutting down). I need to figure out what PCB they ...
Nathan Whyte's user avatar
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0 answers
47 views

Building a MEMS Microphone Monitor System

While I've never used a breakout board when building an electret mic, I have used the small Spark Fun 09068 and Cinimark admp401 boards for MEMS mics. They seem to work with a 9v battery box I built ...
Adrianw's user avatar
1 vote
3 answers
114 views

What is the purpose of having a diode in a resistor divider supplying VGS of a MOSFET?

The purpose of the below circuit is to keep the output low during the ramping up period of V1. simulate this circuit – Schematic created using CircuitLab What is the purpose of Diode D1 and D2 ...
Divya K.S's user avatar
  • 2,908
0 votes
2 answers
90 views

Help with custom monitor 12 V adapter

I have an electrical question about a custom adaptor I want to build. The monitor im using: philips 258B6QUEB/00 https://www.philips.co.uk/c-p/258B6QUEB_00/brilliance-lcd-monitor-with-usb-c-dock It ...
Thomas Kramer's user avatar
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0 answers
88 views

How to prevent water temperature and pH sensor corrosion in salt water

I am going to design an salt water monitoring system. Salt water will cause sensors to rust very fast. Any suggestion on how to prevent it? Any temperature and pH sensor suggest to use in the system?
GYNB's user avatar
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4 votes
1 answer
78 views

How are electric current X-Y coordinates achieved for each individual pixel in a monochrome LCD display?

I took apart a simple blue monochrome LCD and layed out all the layers as pictured below. Just looking at them, I am confused as to which of these layers is responsible for turning the current on/off ...
Sokolq55's user avatar
1 vote
0 answers
147 views

How to prevent grounding issue on Mini DisplayPort

I am attempting to design a board that has a Mini DisplayPort output. When I plug a Mini DisplayPort cable into the board and measure the ground (system ground against Mini DisplayPort shield,) I get ...
TheGamingGiraffe's user avatar
1 vote
3 answers
88 views

Current monitor/sense circuit

Has anyone ever dealt with a circuit similar to the one I have? It is a current sensing circuit but I do not understand how it works. I believe there will be a voltage difference between my R2 and R3; ...
Jay's user avatar
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4 votes
1 answer
138 views

Identify chip labelled SC1186E

I am trying to identify the manufacturer and function of, and hopefully locate a data sheet for, this chip labelled SC1186E. It is in a three-phase power meter, so my guess is, that it is an ADC front ...
ZJL's user avatar
  • 81
0 votes
2 answers
235 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
  • 103
0 votes
1 answer
424 views

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?
Joe Goe's user avatar
2 votes
1 answer
84 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 ...
EquipDev's user avatar
  • 561
0 votes
3 answers
2k 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 ...
Anwer Ak's user avatar
2 votes
0 answers
390 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 ...
dbombuwala's user avatar
2 votes
3 answers
685 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 ...
drodds's user avatar
  • 23
0 votes
0 answers
98 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 ...
seccpur's user avatar
  • 381
3 votes
1 answer
1k 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 ...
Gailu's user avatar
  • 33
8 votes
3 answers
2k 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 ...
dfncrbl's user avatar
  • 89
2 votes
2 answers
640 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 ...
Mutski's user avatar
  • 39
2 votes
4 answers
442 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 ...
Sam's user avatar
  • 515
1 vote
1 answer
541 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 ...
Yanick Salzmann's user avatar
0 votes
0 answers
65 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 ...
HoriaIG's user avatar
1 vote
1 answer
836 views

Leaving DVI hot plug detect pin unconnected

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 ...
Liz Morrissey's user avatar
0 votes
1 answer
92 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....
Moritz's user avatar
  • 13
0 votes
2 answers
2k 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 ...
gabrielepmattia's user avatar
0 votes
0 answers
575 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 ...
Gert Breynolds's user avatar
0 votes
1 answer
80 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 ...
AllenB's user avatar
  • 1
0 votes
1 answer
1k views

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 ...
Asher MS's user avatar
7 votes
3 answers
2k 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. ...
a3y3's user avatar
  • 175
0 votes
0 answers
102 views

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 ...
Kotik_o's user avatar
  • 23
1 vote
0 answers
187 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 ...
Fid's user avatar
  • 181
0 votes
3 answers
2k 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 ...
user1105430's user avatar
0 votes
1 answer
89 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 ...
Kotik_o's user avatar
  • 23
0 votes
1 answer
92 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 ...
Joshua Lee's user avatar
1 vote
1 answer
645 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. ...
MultiMdave's user avatar
0 votes
0 answers
51 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 ...
Alex Turner's user avatar
2 votes
1 answer
1k 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?
Noob_Guy's user avatar
  • 433
0 votes
0 answers
32 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 ...
Adam_Eire_2020's user avatar
0 votes
2 answers
111 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 ...
Joe Simpson's user avatar
3 votes
1 answer
306 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'...
Omar Sultan's user avatar
1 vote
1 answer
636 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 ...
Mafpuw's user avatar
  • 13
0 votes
3 answers
154 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 ...
ebalcsk's user avatar
0 votes
1 answer
552 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 ...
Atila Coimbra's user avatar
0 votes
2 answers
1k 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 ...
mfloris's user avatar
  • 111