CurtPalme.com Home Theater Forum

Htdiy · Joined: 16 Sep 2010 Posts: 7 Location: Gravataí

The projector will not turn on, when you remove the PC connector - 1, and reconnecting the projector, electronic works everywhere except high voltage, checked and found that the component Q1 29D1887 burned, I replaced it with a like and burned tabem . Attached schema component.
I came to ask help on forum, I appreciate any assistance.
I am in Brazil, more IGRs in Gravataí, Rio Grande do Sul.

Excuse the language but I'm utiizando Google to translate and write.

Thank you.

Mário

**Curt Palme** · Posted: Thu Sep 16, 2010 7:02 pm Post subject:

It's rare, but I've had the HV block short out which then blows Q1.

If you post a picture of the HV block, I can see if I have one. You can have it for $10 plus shipping.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Also, when a component like Q1 fails, it will often take out surrounding components. Even a cap can be blown short. Also diodes.

I would also test REG out to gnd for short.

Htdiy · Joined: 16 Sep 2010 Posts: 7 Location: Gravataí

Curt,

The HV Block, was replaced by a HV of the Sony 1040, and after not having worked, returned the original.
It is possible to test the HV Block, because a diagnosis is quite likely, as suggested.
HV Block I still have the spare for testing.

Thank you.

Htdiy · Joined: 16 Sep 2010 Posts: 7 Location: Gravataí

macgyver655,

I tested the diodes and are normal, removed the board for testing, and capacitors do not have equipment for testing.

Thanks

**Curt Palme** · Posted: Thu Sep 16, 2010 9:20 pm Post subject:

With HV problems and no test equipment, you're really down to changing out complete boards and such.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

I had this issue only a few weeks ago with a Sony 1001 QM, wouldnt start with HV board connected, i found the issue to be the HV board shorting to the chassis. I corrected that by putting some plastic shielding under the HV board. This shouldnt be your problem, but it was mine, and you may as well check it just incase.

I replaced a heap of capacitors on the PA board, most of which were way out of spec, some of them though were spot on their rated value, and none of them were leaking.

The 1000 and 1001 are not exactly the same, but they are pretty simular.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Curt, i may still get a HV junction block off you for my 1001 abit later on, the projector now works perfectly fine in dry weather, but if we have a few rainy days i have to jump start it with a hair dryer, blowing warm air at the junction block for 1 or 2 minutes and itll fire up perfectly and run as long as i like, when its an issue, it fires up for 2 seconds then shuts down the HV board.

the only pic ive got that shows this device is this one, it is the long orange coloured one with 5 connections in a line. Can only just be seen at the top of the pic.

**AnalogRocks** · Posted: Fri Sep 17, 2010 7:37 am Post subject:

I wonder if something like Wire Dryer would work for you? It's meant to be sprayed on a cars ignition wires to dry them out. Careful though it is flammable. You may also be OK with silicone spray.

You would need to remove the HV bits from the projector prior to spraying of course.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Hard to say Jeremy, id have to look into it and see, its a strange issue really. Wonder how many others need to start up their CRT projectors with a hair dryer when its wet weather outside eh? Wink

**AnalogRocks** · Posted: Fri Sep 17, 2010 8:06 am Post subject:

I did have my 1252 shut down on a day with crazy humidity. I opened it up and dried it with a fan, so I know what you are saying.

Htdiy · Joined: 16 Sep 2010 Posts: 7 Location: Gravataí

Curt,

I have a multimeter and test on a friend with an oscilloscope if possible such a test.
When burned the sd1887 Transistor, Transistor BU2527AX Phillips replaces it, but it burned too.

As the drain voltage in the HV Block, fails to start the high-voltage burns sd 1887.

I would like to thank the help they have given me, even failing to fix, I had the attention of forista.

Very Thankful

**Curt Palme** · Posted: Fri Sep 17, 2010 2:35 pm Post subject:

HTdiy- that HV block shown in Case's picture above probably has a short in it. When that transistor has shorted for me in the past, that's always what the problem was.

It is also possible that a tube has shorted, or that the HV splitter has a crack, which is putting an overload on the HV transformer.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

And to add to what Curt said, you only need to test those caps for short which you can use your DMM. If those very few components in the diagram are not shorted then you need to check the solder joints on T2 on the PA board. A bad solder connection there will instantly take out that transistor. If you go over everything connected to that transistor and can't find anything then one of the flybacks is probably bad.

The only other freak thing would be is if the +115v supply was way off. But that would be a last guess.

Htdiy · Joined: 16 Sep 2010 Posts: 7 Location: Gravataí

I would like to thank the suggestions given by the avatar, better late than never, thanks.
Currently I use a samsung sp410 Led screen of 113 inches and an Epson w8 on a screen of 160 inches.
For that reason they have not fixed the projector, but I'll try again because the image of the CRT is very good and I love this type of projector.
I've had a eletrohome 8500, sony vph 1000, 1001 and a Seleco SPV 400.

Regards to all.

Htdiy · Joined: 16 Sep 2010 Posts: 7 Location: Gravataí

Problem solved with the projector sony, Flaybacr in short, made the switch and replaced the 2sd1887 two diodes and the projector is operating normally.

Grateful to friends