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Looks like 3 in 1 oil spilled on circuit boards

Someone spilled what looks like 3 in 1 oil all over the circuit boards. Can it be cleaned with soap and water?

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  • foreverflath Jul 15, 2009

    I have been doing some more reading and found in the service book that the crt has ethyline glycol in it. Could this resemble the 3 in 1 oil. I didnt mention that the red lens has been removed and it looked as though thats were the oil looking substance came from. could that be the sealed part of the crt? Is it a loss?

  • foreverflath Jul 15, 2009

    I have been doing some more reading and found in the service book that the crt has ethyline glycol in it. Could this resemble the 3 in 1 oil. I didnt mention that the red lens has been removed and it looked as though thats were the oil looking substance came from. could that be the sealed part of the crt? Is it a loss?

  • foreverflath Jul 15, 2009

    I have been doing some more reading and found in the service book that the crt has ethyline glycol in it. Could this resemble the 3 in 1 oil. I didnt mention that the red lens has been removed and it looked as though thats were the oil looking substance came from. could that be the sealed part of the crt? Is it a loss?

  • foreverflath Jul 15, 2009

    I cleaned them and the circuits are still under protection. Too many hands have been inside, it will now be parted out. thanks for helping, just too much to fix. anybody need parts from a ws 65712?

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I would not recommend cleaning with water, however, if you do clean it with soap and water the board must be immediately dried with dried compressed air.
Any components that moisture can enter, such as unsealed adjuster pots, open variable caps, inductors etc must be avoided. When drying, pay particular attention to area under ICs and SMT components. In can be near impossible to remove all moisture from under these components. A bake in the hot sun for a few hours also helps to eliminat the moisture.

I think a preferred method would be to use a volatile inert solvent to clean the board.
Various commercial PCB cleaner fluids are available from electronic wholesale component suppliers. The board will still need to be dried with compressed air.

Posted on Jul 14, 2009

  • John Bloomfield Jul 15, 2009

    Ethylene glycol is water soluble- therefore should wash off with methylated spirits. It is used as heat transmission medium - may be used to cool lense. Sorry, have no further knowledge on projection displays.

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When you have a remote control that is not working properly---works but some buttons either do or do not work correctly the most common cause for this is something got spilled on the front of the remote--it does not have to be a large amount to cause problems.

The way all infrared remotes work is there is a circuit board inside with black carbon lines etched on it---this includes lines for each function the remote has.


The buttons on the outside of the remote are actually one large rubber like mat and on the bottom side are coated black buttons---when you press a button on the keyboard the button part on the bottom of the mat touches lines on the circuit board and directs the remote to send a infrared signal to the unit it controls.

In this situation you have two choices:

1.) Most remotes can be taken apart and cleaned for this problem--I have done hundreds of them.

a) Once you get the remote apart (the hard part) the rubber mat should lift freely off of the circuit board---if you have to peel it off and feel resistance you will see whatever residue of what was spilled and got under it; it gets between the mat and the circuit board.


b) The surface of the board where the lines are can be cleaned with denatured alcohol.

c) To clean the mat: remove it completely and with a small toothbrush and dish soap gently wash it in the sink with warm water. Then dry it with compressed air or a hairdryer set to air only. When it is COMPLETELY dry put it back into the face of the remote.

d) If there was a spill into the remote it is also a good idea to clean the face of the remote where the buttons protrude and dry it completely before you put the mat back.

e) Put the remote back together and see if it now works.

Your second option is to borrow another remote for the same kind of unit and see it works normally--if it does and cleaning does not fix the original remote--YOU WILL NEED to buy a new original remote for the unit.

I stay away from "Universal" remotes as many either will not work or be missing several features the original one had.

If a KNOWN good remote does not work it is possible but very unlikely that the problem is in the unit the remote conrols.

See attached photo
of a typical remote taken apart--note the lines on the board and the bottom of the buttons on the keypad.

Neverclean the bottom of the buttons with anything except soap and water asany chemicals can damage the black conductive coating on the bottom ofeach button--it will not hurt the lines on the circuit board!

SD TECH

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