How To Fix Laptop Screen Lcd Board Inverter

How To Fix Laptop Screen Lcd Board Inverter
  • Jan 11th, 2024
  • Ranjeet Singh
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Hello Friends, I hope you are doing well!

This blog describes fixing the backlight problem by replacing the inverter for the laptop screen. Using your parts, we will walk you through Fixing a dead LCD backlight laptop screen power inverter. You can then eliminate other possibilities by having a dead backlight. Check your monitor on multiple computers and make sure the indicator light of the monitor stays on and turns on.

Be careful while working with capacitors as inverters for laptop screens; in general, they are high voltage and can give a shock. Also, bridging a fuse is not a very smart option. Manufacturers are cheap, so if they bother you by putting a fuse into a product, it is probably for a good reason.

Prove if it's a backlight.

To prove you have a dead backlight:
1. First, turn your monitor while attached to a computer.
2. Then take a strong flashlight by shining it on the screen
3. Then, look for any dim indication of an image.

An LCD screen resembles a glass pane. To age, there must be a light source to illuminate them.

Read Also: Laptop Hinge Repair Cost in India | Laptop Screen Replacement in India 

The monitor should be pulled apart.

You need first to disassemble your monitor. This unit has four screws which are on the back and the tabs. Pop the things apart by pulling the screws. Work slowly around the perimeter with your fingernail using folded pieces of paper as wedges. This will work well. Until you get it, keep working on it. However, do not use a screwdriver. You can do it without injuring the plastic!

Then, get to the electronic components.

Pull off the metal shielding once you remove the plastic cover from the back. Under the shielding, there will be most likely two boards. One will be the inverter, and the other will be the logic board. The inverter has wires leading to the backlights, and the logic board has the monitor inputs. It is most likely that the cables will be blue or pink.

Find out the wrong.

Look for apparent damage on the inverter board. See whether burnt traces and cracked components are there in your case with bulging capacitors.

Salvage your components

There is no magic in the working of Electronic components.
There is a reason when something is broken. Almost 99% of discarded electronics can be fixed or become suitable components. Take an old VCR or TV and go on Craigslist to grab an old monitor. Find the piece that is missing and replace it.

Where the capacitors were dead and bulging as they went up, they worked on 25v@100F. Where capacitors are being strictly used in a power supply manner, it is okay to increase their capacitance. The capacitors are used to steady the current and kick-start the tubes. Sometimes, increasing the capacitance puts more strain on the power supply, which keeps the cap topped off. However, manufacturers put the minimum size on every component in their never-ending quest for cost-cutting. Therefore, it is sometimes possible to increase the capacitance of the capacitors and improve the unit, which refers to increasing RAM capacitors on computer motherboards.

De-solder and then Re-solder!

Soldering does out with the old and in with the new!

However, remember that most modern capacitors are directional, wherein the cap's black stripe matches the marking on the board.

If it does not work?

In this step, put everything back together and plug it in. If you see nothing, then what could it be? It turns out that there is a surface mount fuse. The online SMD fuses account for 90% of inverter board failures, which you may check online for confirmation.
The SMD fuse is labeled as 'R1" resistor 1 on the inverter board, which has the marking on the fuse as the letter "P" that may be upside-down, having a lowercase "d." Either way, you searched but could not find the amp value of this fuse.

Fuse the bridge (which is at your own risk)

Try to find out the value of the fuse on the surface mount component, which is poorly documented. Use a tiny wire that probably has the thickness of a hair. The original cause for the fuse failure was that the capacitors on their way out were losing capacitance and, in turn, were drawing more current from their source. Therefore, you should use a fuse with an approximately 300 milliamp range.

Put everything together and cross your fingers.

Put all the components back together. Turn off all the external noises by leaving the electronics exposed. When you unplug it, smell for any smoke and listen for any noise.

Then turn on the unit, and if anything is not burning, your fixing of the backlight problem by laptop screen inverter replacement is done successfully!

Here is the List of Authorised Service Centers in Mumbai


Following the steps mentioned in this blog, we hope our laptop users can fix the back-right problem by replacing the laptop screen power inverter.

Frequently Asked Questions

Laptop Repair | Computer Repair | Printer Repair

A blank laptop screen can be the result of a bad inverter board. If you turn your laptop on and see a distorted, dim or blank screen, don't immediately make plans to buy a new one. Instead, consider what components in the display could have malfunctioned.

Turn on the LCD screen and wait for the Multimeter to take a reading. If there is absolutely no activity on your multimeter, that means your inverter board is bad. Turn off your multimeter and put it away after you have finished testing the inverter and then power off your LCD screen.

An inverter board powers the backlight. A backlight inverter board is a common source of LCD backlight problems and can fool people into thinking their monitor is dead. The inverter works much like a battery for the LCD monitor.

The Backlight Inverter is the power supply that rises from a small DC voltage (typically 12V DC input) up to a few hundred volts of AC, with a small output current (typically 6.5 to 7.00ma).

Typically, over 1000 volts RMS is required to initiate lamp operation, with sustaining voltages ranging from 200VAC to 800VAC. To date, the high voltage section of backlight “inverters” has been designed around mag- netic transformers.

Most Segment, Character and Graphic displays will operate with a VDD of 5V or 3.3V. It may be possible to drive the display with as little as 3.0V, but the module may not perform very well in colder temperatures.
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