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trebortaergeht
Joined: 14 Apr 2010
Posts: 73
Location: California
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| Posted: Wed Sep 05, 2012 6:14 am Post subject: Vision 1, no high voltage |
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I went to turn on my projector yesterday, but high voltage never came on. There are no error lights lit, and i have re-seated every chip, board, and connector to no avail. What is the next step for troubleshooting this, i don't have any spare boards to swap with.
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Revox
Joined: 13 Feb 2008
Posts: 158
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| Posted: Wed Sep 05, 2012 10:19 am Post subject: |
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I noticed that the failure detection of the HV on a Barco 909 does not always work as it should.
My tip is a bad quadrupler or a bad EHT board (as "usual" i would say).
You can check the EHT board. If you probe the Quadruplers input, be carefull! All Outputs can be on life potential, so you must probe differential.
Greetings from Germany, Stefan
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Sep 05, 2012 1:09 pm Post subject: |
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Is it safe to assume that it's a 909?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Sep 05, 2012 2:01 pm Post subject: |
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Sorry, didn't read the title. 
You most likely have a bad HVPS, but a bad H board can also cause this. Try reseating the HDM, and if that doesn't work, most likely it's the HVPS. I have stock of both.
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Revox
Joined: 13 Feb 2008
Posts: 158
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| Posted: Wed Sep 05, 2012 4:22 pm Post subject: |
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Sorry, i thought that the vision one is a barco based set.
In My Marquee when the HDM failed temporary, there was a short "sprtzsprtz" noise of the HVps, but i don't know what is happend when the HDM totally fails.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Sep 05, 2012 6:35 pm Post subject: |
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pull out the horizontal deflection board (vertical board in gold box between Blue and green tube) , clean the contacts on the bottom with isoproply alcohol and an old soft tooth brush. Pull off the small daughter board (held on with plastics screw), clean those pins too. The daughter-board pins will typically get so oxidized that the board is hard to remove but Work it evenly until it pops off
Re-assemble and test.
If machine still doesn't run then the HV power supply is likely bad
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