CurtPalme.com Home Theater Forum

Hooty · Joined: 27 Oct 2009 Posts: 16

Up until 2 days ago my 1040Q has worked fine except a slight fuzziness on the blue tube. I got home from work and sat down to relax for a bit but the projector wouldn't turn on. When I turn on the power, the lights and fans click on and off 3 or 4 times and then stop. If I switch the power on and off quickly 4 or 5 times the lights and fans will stay on but I get no picture. Due to the behavior I'm guessing it's either a bad capacitor or a bad tube but I don't have enough experience with CRTs to be confident about that (I have a hobbyist's experience with small electronics but nothing this complex).

Does anyone out there have a clue what has gone wrong?

**Curt Palme** · Posted: Wed Dec 09, 2009 4:15 pm Post subject:

OK first bit of advice:

STOP DOING THAT!!!

The set shuts down for a reason, and by switching the set on and off repeatedly, you're doing more damage than good.

The problem is, the fault could be on almost any board. Without a meter and a service manual, all you can do is swap boards out to see which one is bad. Lots of faults will trigger a shutdown.

Hooty · Joined: 27 Oct 2009 Posts: 16

First off: You're probably right. I wouldn't have tried it if I didn't have a much better projector on the way (meaning when my brother in law gets off his duff and delivers it like he promised). I am trying to get it running again because I plan on giving it to charity, but won't cry if I can't fix it.

It doesn't seem to be protection circuitry shutting it down (although I could be wrong about that). I've run into this problem before with a bad cap on a computer power supply. That's why I was asking if this was a known issue with the power 1040 power supply or one of the tubes since they act as capacitors (or I assume they do since the tubes in crt monitors and tvs do)

**Curt Palme** · Posted: Thu Dec 10, 2009 5:14 pm Post subject:

It can be a bad cap in the power supply, but typically it's a fault elsewhere that triggers the power supply to shut down.

Usually the 1040 supplies are pretty reliable, but I'll sell you another working one for cheap (or I can send a bunch of other boards down in a package so you've got a bunch of spares.

A couple of things to check:

-stuck fans
-shorted tubes.

Disconnect each thick red HV lead from the HV splitter and pull the CRT socket off the back of each tube, one tube at a time. If the set fires up with any two tubes, the disconnected tube is shorted or has imploded. I've seen that a couple of times.

Hooty · Joined: 27 Oct 2009 Posts: 16

Thank you Curt. I will have to see what I can afford after Christmas.

Also please see my edited response, I reread my original and the tone seemed a bit disrespectful which is not what I intended. I have a great respect for you and your technical knowledge and experience with CRTs. I would never have been aware of their capabilities if I hadn't found your site.