Question about Hitachi CMP4121HDU 42 in. Plasma Television

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My Hitachi CMP4121HDU plasma monitor has cooling fans that, over time, have become quite loud. Can these be lubricated or replaced?

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The best solution is to replace them. I have tried quieting down fans in the past by lubricating them of just cleaning the dirt off them. About 90 percent of the time this did not work, and if they seize up it will shut down your tv totally. Best thing to do is order new fans for your set. I will try to find manual with the part number for you.

Posted on Apr 03, 2011

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Yes they can be lubricated. And is not too complicated, all you have to do is to unplug the TV from the wall power socket and use a + medium size screwdriver.
! ) Remove the back metal cover ( lots of screws ) disconnect the fan cable from the main circuit board. Just make a note of the orientation of the Fan's jack. Or mark both the base of the Circuit Board and the Fan jack with a marker pen so as to know which end goes where.
2) Remove the fan and then notice there is a paper or plastic sticker with the brand name on the back of the Fan motor. Remove this sticker and under that You will see a rubber cap, remove this cap with a pin or pointed knife. As soon as you remove the cap you will see the motor shaft coming out of a copper colored bearing. You have to pour oil onto this shaft, better done if you can rotate the Fan blades from the other side so as to let the oil enter the bearing deeper. You can use a spray called WD40 . Very good lubricant. If you have noting else use light cooking oil !!!
3) Retrace your steps and re assemble the fan. The sticker might not stick back because of all the oil there. The function of the sticker is to keep the rubber cap in place and to prevent dust from entering the bearing.
4) Reconnect the Fan and put back the cover & turn on the TV it should smooth and quite. You will have to do this all over again after a year or so.

Posted on Apr 03, 2011

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To find out if the fan is causing the noise, just open the freezer door and push in any fan/light switches. If the noise is louder when the door is open, the evaporator fan motor is the cause. You can't lubricate or repair this motor. You must replace it.

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That being said, I suppose you could disconnect the wires from the speakers and feed them out the edge of the cabinet, you would judt have to cut out a spot big enough for the wires to come out.

The TV has an 8 watt stereo amplifier, so I guess as long as you don't expect to be blasting the windows out, you could attach them to external speakers, or even an amplifier, if it allows speaker in, some do.

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You should call for warranty service. If the set is very new try to get it exchanged.

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The description sounds like the noises are very loud. It is normal with any of these TV sets, if you put your ear right up to the back of the set at the vent holes you will hear some noises. These would be some acoustic harmonics from the power supplies and related circuits.

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