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Questions tagged [monitor]

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89 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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1answer
20 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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60 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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How to find out which Linear Polarizer Film Angle is right for repair?

I recently bought a broken monitor on eBay. The seller partially tore off the polarizing film thinking it was a protector of sorts. Now I want to replace that film. How can I find out which angle (90°,...
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2answers
76 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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1answer
164 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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1answer
76 views

ESD Mats failing with constant monitoring system

Good afternoon, This is my first time posting here, and I apologize if I am doing anything incorrectly. I'm already a member on StackExchange so I thought I would stick to this website for this ...
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39 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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1answer
115 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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2answers
109 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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1answer
17 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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48 views

Connecting two wires to a DC 12v port on a controller board with 4 pads for a monitor

Sorry, the question was difficult to word. Basically I recently bought a controller board for a monitor and the DC cable I got wasn't correct. So until I get the right part, I just want to test the ...
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2answers
60 views

ADC conditioning for Lead-Acid monitoring? [duplicate]

I want to monitor a 12V lead-acid battery using an ADS1110 ADC. This ADC has a reference voltage of 2.048V. Thus, I (think) need to condition my input from, say a 10V-15V level range to 2 volts (0.4 ...
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1answer
65 views

How can I measure the charge current into a small LiPo battery?

I have a SparkFun USB LiPoly charger that by (default) is set at 500mA. If I try and measure the charge current with my DIY multimeters, the charging LED goes out and the meter reports zero current? ...
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2answers
69 views

Best way to monitor on/off state with a microcontroller

I have 3D printer with a cooling fan that by design is on constantly, however it only needs to be on when there is something to cool! I have no idea why they have it on all the time since it is loud ...
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53 views

How Backlit LCD Moniter Works, How it Looks Without a Backlight

I'm thinking about repurposing an lcd backlit monitor's front panel as an 'overlay' type panel over something else without a backlight. My understanding of the function of a backlit monitor that the ...
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1answer
110 views

Should I continue experimenting or not? [closed]

Good day to you all. I just accidentally stripped off the thin lining of metal that is found on the eDP cable of a Lenovo laptop (Lenovo IdeaPad 320-14IAP). The thing happened when I removed it from ...
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1answer
83 views

Reasonable Li-Po Battery Protection Circuit?

I'm designing a circuit to monitor the voltage of a Li-Po battery (single cell 3.7v, 2500mAh, 25A) and switch off the battery when the voltage drops to a certain threshold. The Circuit will also ...
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1answer
76 views

Monitor displaying negative colours [closed]

I found an LCD monitor on a rainy day and I had to completely disassemble it in order to remove all the water. When I dried everything and reassembled it, its colors were inverted! I wasn't really ...
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39 views

LiPo Monitor IC vs MCU

I am planning to build an electric bike powered by a 12S LiPo battery, and I am trying to decide how I should implement monitoring of the individual cell voltages. Manufacturers like TI provide a ...
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1answer
454 views

What lvds connector do I have

Can someone help me find out what type of LVDS cable I have and point me in the direction of an adaptor to HDMI. Thanks. Backstory: I recently had to throw out an old Sony Vaio All in one PC and ...
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1answer
102 views

Temperature sensing bee hive

I am a honey bee researcher and I want to build a temperature sensing system to monitor the temperature changes in the three dimensional space within the hive body using 5 sensors on each hive frame (...
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0answers
101 views

LED-Monitor-Firmware reverse engineering / disassembly => replace manufacturer startup logo

I have a display from a disassembled led-monitor (Wortmann Terra 2446W), that I want to use for a SmartMirror-project. Unfortunately, the monitor shows a big manufacturer logo when connected to power, ...
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0answers
51 views

Safe to use StepUp-Converter to power LED-Monitor?

I would like to use the following setup, since I already have the meanwell-powersupply. Can anybody tell me if this should be safe as long as I care for good cooling of the Step-Up-Converter, good and ...
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0answers
104 views

Li-pol battery voltage measurement

I want to measure Li-pol battery voltage with STM32 MCU. I power STM32 with 3V so I need a voltage divider for battery connection (Li-pol max voltage is 4.2V). Moreover, I'd like to add N-channel ...
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2answers
152 views

How sensitive are the DVI sync signals?

We're trying to output a full mono-colored screen signal in 640x480 resolution over DVI to a Samsung monitor from an FPGA board. The problem we have is that we don't get any picture showing, instead ...
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1answer
1k views

Can I replace a 33uF 100v Electrolytic Capacitor with a 47uF 400v Electrolytic Capacitor? [closed]

I'm -Extremely- new in the DIY Electrics. So go easy on me as I have 0 Electrical Engineering background. Handle me like a 5yo, haha. I recently decided to give self-repairing the old electronics I ...
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2answers
98 views

RS232 Bridge cable stopping after some time

Im trying to reverse engineer a very old DOS program that connects with a machine using RS232, for this i setup a typical in the middle connection like this: From Computer A to PC A connection im ...
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1answer
217 views

How do LCD screens repair themselves?

Hey, electronics people: A few months ago, I cleaned a spot on an LCD flat screen. Whatever it was, it was stuck on there pretty good and I guess I pushed down on it too hard (actually wasn't hard at ...
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2answers
107 views

What happens if I use a DC adapter with a15v output with a PC monitor with a 14v rating?

I have a PC monitor with a 14v rating but it's original DC adapter is broken. Can I safely use a similar DC adapter from a similar monitor, but with 15v output instead? How likely is the 14v monitor ...
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1answer
108 views

Do cold cathode fluorescent lights (CCFLs) degrade as a function of idle time?

I have a HP LP2475w display with a cold cathode fluorescent light (CCFL) backlight. It is approximately 8 years old. However, it has only 9041 backlight hours, meaning it has been used for only 12.9% ...
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2answers
85 views

What is the best way to design voltage monitor with tri-colour LED?

I've built a power supply with regulated +15v, +12v, +5v, -12v and -15v outputs and I'd like to build a voltage monitor to let me know if any of the rails are above or below their stated voltage. I ...
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2answers
46 views

current monitoring

In my camper I have standard 3 wire power coming in. 2 are 120vac and 1 neutral. Since the wires feed separate sides of the circuit breaker box with the neutral being common to both. Can I place 1 ...
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2answers
176 views

Remotely monitor condition of fuse

I am installing five 12V batteries in a motorhome. The batteries will be wired in parallel for a 12V system and will be contained across three different enclosures. Each positive cable link between ...
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1answer
1k views

A novice question about 60Hz vs 50Hz frequencies in monitors [closed]

In laptop and desktop PCs monitors have parameters such as 50Hz 60Hz ect. What is this frequency about? Is there a DC AC converter inside the computers?
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1answer
1k views

Can I use an arduino as a LCD controller?

I saw this video where a person used a graphical LCD as a very rudimentary monitor for his computer using an Arduino... I was wondering whether it is possible to use an Arduino as a controller board ...
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1answer
2k views

Low power battery voltage monitor

I would like to measure the battery usage of my ESP32 device. As my device runs in deep sleep mode 99% of the time, it's important that the battery monitoring circuit does not add too much to the ...
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1answer
294 views

How to connect LCD backlight wires [closed]

I have bad caps in my LCD monitor. While taking it apart, I disconnected the LCD backlight wires to get to the power supply. I blame bad product design and my own stupidity for not checking how the ...
1
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1answer
248 views

What are these values on this capacitor?

As you can see from the images, this capacitor needs replacement, however I do not know what the top 2 values mean. It doesn't state it's capacitance either... I assume the first value is decijoule ...
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1answer
1k views

EGA display converting to VGA - screen's shaking

I've recently tried to make conversion from EGA (probably, couldn't get scope to verify) to VGA to replace an old factory CRT monitor to LCD. Screen displays fine but it appears to shake vertically ...
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2answers
3k views

Do LEDs require more power to function as they age?

I have a strange issue with the LED backlights of the LCD monitor i'm using. I have had it for about 5 years and up until this time have run it at only 10% brightness to reduce eye strain. However ...
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1answer
60 views

Deflection coil/yoke needed - any ideas on where can I get it? [closed]

One of our molding machines screens has stopped working well. We've found out that the deflection coil has been burnt at glueing area and few wires have disconnected. Maybe somebody here knows if ...
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2answers
687 views

How to figure out what DC power jack I need? [closed]

so my monitor's power jack has burned up and was wondering if there is anyway to identify what jack I need to replace it? On the PCB it says J101 but Google is not coming up with anything.
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1answer
419 views

Modifying VGA Controller For My Monitor

I saw this VGA demo for a 640x480 monitor http://pumpingstationone.org/2013/04/nerp-fpgaok/ and I would like to run it on my monitor using a Basys-3 FPGA. The GPIO demo code for the Basys-3 board ...
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1answer
76 views

Cost of early color monitor versus TV [closed]

Back in the seventies and eighties, an important design choice for a desktop computer was whether to use a television or a dedicated monitor for display. A monitor could give better resolution; on the ...
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2answers
1k views

What advantages do CRTs still have over more modern display technologies? [closed]

Are there any uses for Cathode Ray Tubes in modern world. TVs and Monitors were first, then Oscilloscopes, I am not sure about Radar but are there any applications which will only work with CRTs or ...
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2answers
5k views

Wiring a 3.5mm Audio out jack where Speakers were previously

I'm stumped on this one. My monitor has these cruddy un-amplified speakers that you can barely hear when there is any other sound in the room you are in. My solution was to wire an audio out jack to ...
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3answers
201 views

Monitoring signals on a bus with LEDs

I'm looking for a way to visually monitor logic signals on a bus with use of LEDs of different colours. The conditions are: I want to be able to visually distinguish the following states: a) Logical ...
1
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1answer
367 views

Why do large PCB traces have solder points/islands/stripes on them?

This is from a power supply for an old PC monitor. I opened it up to see if I could fix it (likely bad caps) and saw this rectangle matrix. What's the purpose?
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3answers
912 views

How to measure 6S LIPO battery juice in percentage from Raspberry Pi?

I've got a Raspberry Pi and I want to use it to measure the percentage of charge which a 6S LIPO battery pack has left which I then send to a server over the internet. I assumed there would be easy ...