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LCD Projector the filter has been cleaned....the machine blown out with canned air...it appears to be clean. .the LCD can be turn on and the image will come up for awhile then the machine will automatically turn itself off....HELP

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  • Ken
    Ken May 11, 2010

    So where do I get a Ballast for a LP 70?  I'm having the same problem.  Filters are clean, fans are working but the projector lamp will only come on for an hour then turns off and light blinks indicating overheat.


  • Cameron Scott May 11, 2010

    Sounds like an overload protection circuit. When internal components (capacitors, transistors, etc.) fail, electronic equipment such as amplifiers, etc. have an overload protection circuit that will trip in order to prevent permanent damage to the unit.

    Can you post make and model?

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Hi cdeaney

Does the Projector prompt you that the filters should be cleaned ?

If not , take out your lamp and check for any abnormality like discolouration or bubbles on the lamp shaft.

If you can't spot anything , it will most probably be your Ballast ( lamp's powersupply ) that will either need repair or replacement.

Tip : Rather replace the Ballast , I've had numerous of cases where the repaired Ballast gave the same problem a couple of months down the line when repaired.

Posted on Apr 24, 2008

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After replacing the lamp and reseting the lamp settings, the projector automatically turns off after approximately 5 minutes.


has the projector been cleaned? You can blow it out with air but don't spin the fans too fast or they will break. If it has a filter has it been cleaned? Don't use canned air on it when it is on though.

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How do i access the air filter on the PJ551?


Air-Filter
Cleaning the Air Filter
The air filter should be cleaned as described below at intervals of approximately 100 hours. When
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1 Switch the projector power supply OFF, and remove the power cord from the power outlet.
2 Clean the air filter with a vacuum cleaner.
3 Reset the Filter Timer using the function of the FILTER TIME on the OPTION Menu. Please
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Replacing the Air Filter
Replace the air filter if contamination cannot be removed, or if it is damaged. To order a new air
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1 Switch the projector power OFF, and remove the power cord from the power outlet.
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Check air flow


Unclip the air filter covers and remove the filters, making sure not to let the dust stray into the machine.
Clean the filters. Depending on the type of filter, either wash them in mild washing up detergent or replace them if they are the paper element type.
That is all one can do without stripping the machine down and clean the vanes on the fans.

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Try reseting the filters for the lamp and also clean the air/dust filters.

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How we can clean airfilter because message is appearing regarding clean your air filter


check in the menu to see if there is a filter timer that you can reset. if so, reset it. if not, there is an air flow sensor on the projector that will send that message if the air flow is decreased so the projector does not overheat. find the filter and remove it. blow it out with canned air and blow out the projector as well. replace the filter and enjoy!

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Clean any external dust filters or air openings in the unit.If you don't want to remove the filters, you can simply use a vacuum cleaner hose to suction away the dust from the filter element--same effect anyway. The unit probably does indeed need a thorough cleaning.
The yellow effect is most probably a burned BLUE polarizer filter located behind the blue LCD panel. (Color key--Purple onscreen=green lcd, baby blue onscreen=red lcd, and yellow onscreen=blue lcd). That's how you can tell which lcd has dust on it! Usually, the green lcd has the most free area around it and collects the most visible dust. (large purple specs) The polarizer filters can get burned due to excessive heat (not keeping proper ventilation). Of course, it might be the blue LCD panel which is failing prematurely due to heat build-up over time. The polarizer filter isn't that expensive if it can be replaced, however, the actual lcd panel IS.---Rick

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1 Answer

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Hello there. First, some info you need...Green LCD=purple onscreen, Red LCD=cyan(baby blue) onscreen, and Blue LCD=yellow onscreen.
These spots (specks?) are probably dust particles that get past the filter. Annoying but harmless. To check if they are indeed dust bits, if you can focus sharply on them, then yes, its dust. To remove the particles completely will require a service. They will only return eventually. You can try to blow out the biggest offenders with some canned air. And, to help slow down dust entry, keep the dust filter cleaned so that the unit always has plenty of air movement--you'll have a cleaner image with the added benefit of LONGER life of the lamp and projector components (dust is the number 1 killer of projectors)

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You have 1 of 2 possible problems.

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When the lamp operation time exceeds 2000 hours*1 *2, the projector automatically shuts off and can’t be used until the lamp is replaced and the lamp operation time is reset.

Your machine is designed to give visual warning messages at 1500 hours used, and 1900 hours used. Did you see any visual warning about lamp life over the past few months?

If you were experiencing an overheating problem, a "TEMPERATURE!!" message would flash up on the screen just before the unit shuts down. If there is no warning, you don't have a heat problem.

If you have a replacement lamp available, install it and reset the lmap hours according to your user manual. If you don't have the manual, google it on the web (it available).



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