Polarizer Replacement For Tri Lcd Projectors Repair Guide

Difficulty

Moderate

Steps

Time Required

                          30 minutes

Sections

Polarizers
18 steps

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Introduction

Step 1

              Polarizers

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.

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.

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Step 2

Start by removing these two screws (size 4) underneath the lamp cover.
Removing the lamp is not necessary for this repair.

Start by removing these two screws (size 4) underneath the lamp cover.

Removing the lamp is not necessary for this repair.

Step 3

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

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

Step 4

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

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

Step 5

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

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

Step 6

              Remove the Main Cover

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

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

Step 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.

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.

Step 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 i
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

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 i

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

Step 9

Remove this screw (size 3).

Remove this screw (size 3).

Step 10

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

Remove the left screw (size 1)

Remove the right screw (size 2)

Step 11

              Remove the Mainboard

Carefully flip the mainboard up to the right.
The board WILL catch on the bottom left corner, so be careful.

Carefully flip the mainboard up to the right.

The board WILL catch on the bottom left corner, so be careful.

Step 12

              Remove the Polarizer

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

This is the green polarizer

Remove the screw and pull it out

Step 13

This is a burned polarizer.
If yours looks like this, you’ve found your problem
If you polarizer looks fine, refer to step 15.

This is a burned polarizer.

If yours looks like this, you’ve found your problem

If you polarizer looks fine, refer to step 15.

Step 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.

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.

Step 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, ignore the next step.

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, ignore the next step.

Step 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.

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.

Step 17

              Remove the Yoke

WARNING: My knowledge is spotty beyond this point. Please do you own due diligence and edit this guide if you find any good info.
If your polarizer was not burned, continue with the disassembly to remove the yoke. (size 5 screws)

WARNING: My knowledge is spotty beyond this point. Please do you own due diligence and edit this guide if you find any good info.

If your polarizer was not burned, continue with the disassembly to remove the yoke. (size 5 screws)

Step 18

With the yoke removed, you have access to the exit polarizers.
These do not go bad as often as the green entrance polarizer, but it still happens sometimes.
To remove, cut the adhesive beads circled in red and remove the polarizer you think is bad.
Once again, you will need to source new polarizers which are largely standard across Epson projectors.
Silicone works well to secure new polarizers. Two part epoxy may also work, but I haven’t tried it.

With the yoke removed, you have access to the exit polarizers.

These do not go bad as often as the green entrance polarizer, but it still happens sometimes.

To remove, cut the adhesive beads circled in red and remove the polarizer you think is bad.

Once again, you will need to source new polarizers which are largely standard across Epson projectors.

Silicone works well to secure new polarizers. Two part epoxy may also work, but I haven’t tried it.

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

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                    Timothy Fryer

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