How To Test Projector Lamp Is Bad and How To Measure Projector Screen


By Arindam Roy

To start test projector lamp is bad, first connect the projector to power outlet and then turn it on. You should be able to see a light beam from the projector onto a wall. If there’s no beam, the lamp is virtually dead (the picture will just appear as black).

In order to test for this condition in your own home you need an LED flashlight. To avoid damaging expensive electronics, make sure that this flashlight doesn’t have lights in it. A keychain LED flashlight is best because its battery lasts several hours of continuous use and they are pretty cheap at any convenience store or pet store.

TIP: The project lamp is fine when the battery is removed, because it can be tested with a common bulb.

A normal light bulb will give you a white light, but not a beam of light. A blow lamp will give you a much more intense beam of light, the same type as that of a projector lamp would produce on a wall or screen. You may use any type of bulb for this test, but avoid screwing in anything electrical into your projector lamp circuit board.

Do not touch the inside of the lamp with soiled hands because you may damage the internal parts by static electricity buildup. For a quick test, hold the bulb up to one side of the projector to see if there is any light being emitted from it.

To make sure that you are having all the necessary information, and not just relying on your memory alone, print out this page.

In order to test for this condition in your own home you need an LED flashlight. To avoid damaging expensive electronics, make sure that this flashlight doesn’t have lights in it. A keychain LED flashlight is best because its battery lasts several hours of continuous use and they are pretty cheap at any convenience store or pet store.

Read more: Best Portable Projectors in India 2021: Expert’s Choice

TIP: The project lamp is fine when the battery is removed, because it can be tested with a common bulb.

A normal light bulb will give you a white light, but not a beam of light. A blow lamp will give you a much more intense beam of light, the same type as that of a projector lamp would produce on a wall or screen. You may use any type of bulb for this test, but avoid screwing in anything electrical into your projector lamp circuit board.

Do not touch the inside of the lamp with soiled hands because you may damage the internal parts by static electricity buildup. For a quick test, hold the bulb up to one side of the projector to see if there is any light being emitted from it.

When you’re in a show room or when you will be purchasing a new projector, take your flashlight and make sure it fits into the project lamp socket before deciding on what to buy. If it doesn’t fit, you’ll have to find out what adapter (if any) is required.

After purchasing a projector do not throw away your flashlight. You may need it again.

If you’re only going to have one flashlight, then I suggest that it be the LED type. It is more powerful than a normal flashlight and will last at least 500 hours on a set of batteries, which means that you will barely have to change the battery before the end of its life. Buy LED lights. They are very efficient at turning electricity into light (90% vs 10-15% for normal flashlight bulbs). They are also small, and can fit into your glove compartment or your tool belt easily.

Read here: Best Projector under 10000 Rupees in India 2021

Now that you know if your projector lamp is bad or not, you can continue reading about Technical Support for the web page “how to test projector lamp is bad”.

Also read: Best 4k Projectors in India 2021

How to measure projector screen

If you are thinking of buying a projector, and you don’t know what size of screen to buy, then this article is for you. It will tell you how to measure your projector screen so that it fits perfectly.

It’s easy enough to buy a new TV that fits a certain size of screen — but if you’re buying a projector, things might get confusing! A bit of research is required before making your purchase.

There are several different ways to measure your screen. For example, you can measure the diagonal of the picture. Alongside this is a measurement called the ‘aspect ratio’ which is basically just x:y being converted to 1:1.

In order to find the diagonal of your screen, you need a tape measure and two people (or eyes on an iPad) who can read it. The plus side of this method is that you don’t have to worry about any roundness or other projection problems that might occur with non-square screens. However, it’s not perfect and getting two people to agree on what size the screen is will be tricky. (I’ve had trouble doing this myself!).

Another option is to use a projected image on a whiteboard. It’s easy and accurate, but requires access to the projector and it might be difficult to get people to agree on the size. This is why I have opted for dividing the screen into segments which I will explain below.

You may also like: Best Projector for Home You Can Buy in India 2021

A third method is using projectors from different manufacturers and measuring them with densitometer or grey scale meters. This is the best option as it’s fast, accurate and easy to measure. However it’s also the most expensive, so I think the option of using a non-projector screen for testing is preferable.

Measuring is straightforward. Find your projector and mark out segments on the wall, making sure they line up with the edges of your screen. This can be done either with tape or using a permanent marker. You need to decide on how many segments you are going to measure – I would suggest starting with ten.

Once this is done, you mustn’t move the projector at all or fiddle with it while taking measurements, or else you will not get an accurate guide on how big the screen needs to be. Just wait for the measurements to be taken and then just measure the screen again to check.

If you want to use the grey scale or densitometer method, you will not be able to get this done without the help of a professional projector service. These meters are expensive and if you want to use one, you may need to have one available at all times. If you don’t have this option, then I would just go with the tape measure method.

1) First take a large sheet of A4 paper and fold it into a rectangular shape with each vertical side 10cm longer than your screen size. The paper should be folded in half (fold in half again if needs be) so that it is 8cm wide and 10cm long when flat.

This will form the segments that your screen will be divided into. This is handy for finding out if your screen size is the same as your projector’s native resolution. If you measure a different size than your projector does natively, then there are other problems that can occur with the projection that I’m not going to discuss here, but it’s important to check and make sure that everything is set to optimally fit before buying.

Relevant reading: What Is Projector Throw Ratio And Why Is My Projector Dim?

2) You need a section of whiteboard and two people who are familiar with projectors to confirm that all segments can be seen on the whiteboard during presentation.

3) Put the projector up onto a stand and then move it back as much as needed so that all segments can just fit inside each other. This will ensure that if the room is full of people, then they will not be able to walk into the projected image.

Make sure you measure from the floor to the centre of each segment so that there are no errors. If you can’t do this, then I would suggest drawing a small circle on a piece of card and placing it over the projected image. Ideally you want to make sure that both people can see all segments at once without having to move around too much.

4) Now that the screen has been measured, you should measure each individual segment. (The whiteboard will be marked up with the size of each part so that it’s easy enough to find). This will give you a guide on how big your screen needs to be so that the picture fits exactly into place.

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