Polarizer Replacement for Tri-LCD Projectors

Scritto Da: Timothy Fryer

Commenti: 4

Polarizer Replacement for Tri-LCD Projectors

Difficoltà

Moderate

Passi

Tempo Necessario

30 minuti

Introduzione

If your projector is projecting an image with a green tint, this may indicate a burned green polarizing filter. In this guide, I will show how to replace it, as well as share a few other tips on solving image issues. I will be working on a Powerlite 93+ in this guide, but most Epson Tri-LCD projectors are built very similarly, and the concepts in this guide can be carried over to any Tri-LCD projector.

Passo 1

First of all, there are five screw sizes you'll encounter in this guide. I'll refer to them as size 1-5 throughout this guide.
Far Left (size 1): These screws secure the mainboard. There is also one helping to secure the I/O plate.
2nd from left (size 2): This screw secures a ground wire to the I/O plate.
3rd from left (size 3): These screws are used exclusively on the I/O plate.
4th from left (size 4): These screws hold the projector's outer case together.
2nd picture (size 5): Two of these screws secure the yoke assembly.

Passo 2

Start by removing these two screws (size 4) underneath the lamp cover.
Removing the lamp is not necessary for this repair, but may make the job easier.

Passo 3

Remove these 5 screws (size 3) followed by the panel they secure.

Passo 4

Remove these 8 screws (size 4) which secure the top cover

Passo 5

Open the air filter cover, otherwise it will prevent the top cover from being opened

Passo 6

Place the projector right-side up and lift off the cover. Be sure to remove this ribbon cable.

Passo 7

Remove all 4 size 1 screws in RED.
Depending on your specific model of projector, you may also need to remove the black trim piece underneath the screw in the bottom right corner.
Do not remove the screw inside the BLUE circle. Doing so will cause a metal brace to fall into the projector which is difficult to reinstall.

Passo 8

Unplug all of these connectors.
Note that one on the top left corner is on the bottom of the board
Although the metal shield is removed in this picture, you do not need to remove it
Removing these connectors will allow you to flip the board up and out of the way. If you want to remove it completely, unplug all the connectors
Don't worry much about not being able to remember where each cable goes, most of them use different connectors to make it impossible to mess up

Passo 9

Remove this screw (size 3).

Passo 10

Remove the left screw (size 1)
Remove the right screw (size 2)

Passo 11

Carefully flip the mainboard up to the right.
The board WILL catch on the bottom left corner, so be careful.
Side note: another common problem is having one of the mirrors fall out of place due to heat. It may be a good idea at this step to remove the cover of the mirror housing and check for this problem. If one of them has fallen off, use two-part epoxy to put it back in place, making sure to keep it pressed firmly and evenly against its seat.

Passo 12

This is the green polarizer
Remove the screw and pull it out

Passo 13

This is a burned polarizer.
If yours looks like this, you've found your problem.

Any advice on where to order one?

fl sf -

Passo 14

This is what a good polarizer should look like.
You'll need to source a new one, which can be tricky. Lots of Epson projectors use the same polarizer though, so you may be able to pull one from a different projector.

Passo 15

Once you have a new polarizer, install it and the mainboard in order to test the projector. There is a kill switch for the lamp door you will need to hold down in order to power on the projector while it is disassembled.
If the level of green looks good, you are finished and can proceed with reassembly
If the level of green looks off, proceed to step 16

Passo 16

As you can see, the screw doubles as an adjustment point, which you may have to adjust to get a good green level.
Cut through the glue and slide the polarizer left or right until the projector's color looks good. This can be a bit tedious because you need to reinstall the mainboard to test it between each adjustment.
Sliding to the left will increase the amount of green let through.
Sliding to the right will decrease it.
Once you get it adjusted how you want, you're done! Just reassemble the projector and you're good to go.

Conclusione

To reassemble your device, follow these instructions in reverse order.

Autore

Timothy Fryer

Membro da: 14/10/19

521 Reputazione

3 commenti

Where did you order the polarizers from?

fl sf -

hola tengo un epson 395W me hace una mancha roja por un lado y el lado contrario una azul que cubre el lateral y la parte superior los puedo reemplazar por otros de misma serie powerlite sin importar que no tengan la misma nomenclatura ejemplo H395R el mio y este de la imagen aqui de ejemplo es H372R unicamente tienen que ser de el tamaño y color igual ? Gracias

Ernesto Bucio -

Your issue sounds more like a mirror that has fallen off. I'd recommend disassembling through step 11, removing the cover of the mirror housing (large black "U" shaped piece) and checking if there is a loose mirror. If there is, two part epoxy can be used to glue it back in place. If you do need a new polarizer, they are compatible across most Epson models, but I don't know specifically which ones. If it looks visually similar, it should fit.

Su problema suena más como un espejo que se ha caído. Recomendaría desarmar hasta el paso 11, quitar la cubierta de la carcasa del espejo (pieza grande negra en forma de "U") y verificar si hay un espejo suelto. Si es así, se puede utilizar epoxi de dos componentes para volver a pegarlo en su lugar. Si necesita un polarizador nuevo, son compatibles con la mayoría de los modelos Epson, pero no sé específicamente cuáles. Si se ve visualmente similar, debería encajar.

Timothy Fryer -