Other signs of a blown capacitor include a loud humming noise, lines across the screen, and multiple images. The power supply unit is one of the most expensive components in the monitor. If the problem is more serious than a blown capacitor, the price of repair could be considerable. A replacement may be a better idea if your monitor is getting old.
Wrap a pencil tip (or other blunt, narrow object) in a damp, non-abrasive cloth. Rub very gently over the stuck pixel. Rubbing too hard can cause further damage. [1] X Research source Search for stuck pixel repair software online. These conduct rapid color changes to jolt the pixel into working again. Purchase hardware designed to plug into your monitor and repair dead pixels. If none of the above works, you may need to replace your screen.
Run a soft cloth or other object over the screen. If you feel any broken glass, do not attempt repair. Replace the monitor instead. Rub the scratch with a clean eraser, as gently as you can. Wipe off the eraser whenever residue builds up. Purchase an LCD scratch repair kit. Read this article for more homemade solutions.
The panel serial number should be displayed somewhere on the device, usually on the back. Use this to order a new panel from the manufacturer. While you can attempt to replace the panel yourself, the process is difficult and can expose you to dangerously high voltages. Follow a guide devoted to your specific model, to maximize safety and success rates.
If the picture responds to input but displays a messy image, such as jumbled multicolored squares, the AV (audio visual) board may be damaged. This is usually a rectangular circuit board located near the audio and visual cables. Replace obviously damaged parts using a soldering iron, or order a replacement board and carefully install it to the same screws and ribbon cables. The main control buttons may be faulty. Clean them with a metal cleaner, or jostle to attach a loose connection. If necessary, locate the circuit board they are attached to and re-solder any broken connections. Check input cables for damage, or try other cables of the same type. If necessary, inspect the circuit board they are attached to and re-solder damaged connections.
Be honest about your abilities. If you have never replaced a circuit board or handled electronic equipment before, hire a professional. This is not a good repair for beginners. Wear static-free clothing and work in a static-free environment. Keep the area clear of wool, metal, paper, lint, dust, children, and pets. Avoid working in dry or wet conditions. A humidity level between 35 and 50% is ideal. Ground yourself before you begin. You can do this by touching the metal chassis of the monitor, while the monitor is off but plugged into a grounded outlet. Stand on a low-friction surface. Before working on carpet, treat it with an anti-static spray. Wear tight rubber gloves if you are still able to manipulate the components involved.
Even if your laptop has a “non-removable” battery, you can usually remove it after opening up the device. Follow an online guide for your laptop model. Some components inside the laptop will continue to hold charge. Use caution and do not touch any component until you have identified it.
Consider photographing the monitor before you separate any connections. This will help you fit the monitor back together again.
Prying apart components with a metal object risks destroying them with chipping or an electrical short. A metal object is relatively safe for this initial step, but do not use it for any further steps.
If you are not sure which board is the power supply, search online for an image of your specific model. Do not touch any of the metal pins on this board. They may deliver an electric shock.
Some ribbon cables have a small tab you can pull to disconnect them.
Purchase a resistor in the range of 1. 8–2. 2kΩ and 5–10 watts. This is much safer than using a screwdriver, which may create sparks or destroy the board. Put on rubber gloves. Locate the pins attached to the largest capacitor. Touch the two resistor leads to the pins for several seconds. For best results, test the voltage between the pins with a multimeter. Use resistor again if significant voltage remains. Repeat with each of the largest capacitors. The smaller cylinders cannot typically cause serious harm.
If none of the capacitors look damaged, test each one with a multimeter set to resistance. Some capacitors are shaped like small discs instead of cylinders. These rarely break, but check to make sure none are bulging outward.
Size — identical to the old capacitor Voltage (V, WV, or WVDC) — equal to the old capacitor, or slightly higher Capacitance (F or µF) — equal to the old capacitor
Use soldering wire suitable for electronics. If you’ve lost track of where the capacitors were located, look online for a diagram of your model’s power supply board.
Some components can deliver a dangerous electric shock. Do not touch any circuit boards during your search, unless you are wearing rubber gloves.
Before you try this, confirm that the monitor still produces a visible image when you shine a light on the screen. If it has stopped displaying an image entirely, you may have not connected it correctly after the light replacement. Check thoroughly for loose connections.
