Question about Mitsubishi XD70U Multimedia Projector
I replaced the lamp. but it still has the two red lights Standby and Auto. If I turn it off and turn it on again with the standby botton pressed, the fan works for a second and stops, and comes again, when I release the standby botton, the two lights are flashing in red again, and the fan doesn't work. The lamp never turns on.
If your comfortable w/surface mount troubleshooting and soldering,
download the service manual from elsewhere online. Part of the
troubleshooting tree for this type of problem is to check the surface
mount fuses on the underside on the Main PWB (schematic page 1/8). On
mine, the 12V surface mount fuse, F3004 (2.3A) was open (quadrant C1 on
the schematic). Replaced it, reassembled the projector (3 interlocks
don't 'cha know) and it came up just fine.
Posted on Dec 10, 2007
SOURCE: Lamp turns off
The solution is a weird one. I had the same problem with my Sony Cienza VPL-HS1. Run for about 5 minutes and then the lamp would go out. The warning would show that Lamp/Cover was an issue. I assumed the lamp had reached its lifespan.
All it was, was the filter sitting in the filter box has a small trigger switch that turns off the lamp as a safety when someone inadvertently opens the cover for the filter.
Well, strangely enough, the box and the cover are sized in a way to expand when they heat up. (which they do aggressively) When they heat up they expand, and ever so slightly move the filter away from the switch far enough to trigger it to the off position (only about 1/64th of an inch).
Thats why when some of you tip your projector on its side it runs ok (gravity pushing the filter back in place).
The solution is to put a tiny strip of duct tape along the far edge (the edge opposite of the switch) of the filter on its plastic surround. This will snug-up the filter harder against the switch. Even when it tries to shift under expansion and contraction, it will not allow the switch to poke out far enough to turn off.
So, a penny of tape does the job!
JC Dallas Texas
Posted on Dec 22, 2007
SOURCE: Panasonic PT L501U Projector
Have you replaced the lamp ?
If you haven't - take out the lamp and chech for any irregularity on it - i.e. - discolouration , vein like looking marks ( black or white ) and also if the shape of the shaft is off.
If there is no visible damage it might be a faulty Ballast ( lamp's powersupply ) - especially if you cannot get it out of stanby once it has shut down.
Posted on Apr 17, 2008
Ok, so forgive me, I'm going by memory. Take the top cover off (4 screws on the side). Take the top silver shield off, look at the screws and only take off the ones you need. It's ok if you take more off, but its just more screws to track. You will need to take off the back outer cover. You will need to unscrew the hexagonal screws that the vga-out port uses to screw the connector to, as these are holding the back plate on. Once you get in, the board you need to look at is on the bottom back. Look for a capacitor that has a rounded top, not flat like the others. You will need to replace this with the same voltage and capacitance. Try an electronics site on the internet to get the right replacement if you cannot find it locally. Sorry for the poor instructions, but its just been too long. As a practice, take pictures as you go (during removal of parts) and you can use them to reinstall. Hope this helps as mine is still working.
Posted on Sep 09, 2008
First check your lamp to make sure it is seated properly in the socket.
Then check all of your interlocks (see your manual for locations), these are usually located on any hatches or doors that allow access to the lamp and or fan area. Once you check your interlocks make sure the filter and fan area is clear of dust, (some projectors have air flow sensors), and the recheck the interlocks. Once this is done , If the interlocks are not broken, or the lamp fuse blown, the projector should be working. If not it is the lamp that needs changing.
I know this may be expensive, however these lamps do go bad, as much as we wish they would not.
If you still feel it is not the lamp, have a technician check the voltage levels to the lamp and the levels of the control board circuitry.
I hope this helps,
Posted on Nov 20, 2008
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