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friedwart
Joined: 07 Jul 2010
Posts: 54
Location: Earth, Europe, Germany @ N 51°43'10.73'' E 14°39'05.52''
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| Posted: Thu Oct 07, 2010 3:01 pm Post subject: Marquee 8500 H-Fail |
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Hello,
I have a problem with my M8500. Sometimes the picture disappears with h-fail light on and reappears after one or two seconds, too large and defocused. It then shrinks to the correct size and focus. Sometimes it happened only one time, sometimes a few times behind one another. Another time I can watch a whole movie without any problems. It seems to appear only with horizontal scan frequency of 60kHz and above. I did never have a problem with 720p@50/60/72 or 1080i@(up to)96 which are less than 60kHz horizontal. All caps on the HDM are changed with Panasonic FC series. BTW it is a 2003-08 HDM and I tried a 2003-07 with the same problem. Can anybody help me please? Thanks a lot.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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friedwart
Joined: 07 Jul 2010
Posts: 54
Location: Earth, Europe, Germany @ N 51°43'10.73'' E 14°39'05.52''
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| Posted: Thu Oct 07, 2010 3:45 pm Post subject: |
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| Nashou66 wrote: | Try to clean the chips on the CLM, especially U7 on the Deflection processor board. If it still persists then try to find another HVPS to test.
Athanasios |
To cleaning the chips I have to get a removal tool first. I'm glad that I have a complete set of spare boards and power supplies, so I'll try to swap the HVPS (do you really think it could cause by the HVPS?).
Greetings from Germany
Freimut
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Thu Oct 07, 2010 5:26 pm Post subject: |
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Hello
It could be arcing in a tube or from the anode wiring (pink cable going to each tube bell.
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friedwart
Joined: 07 Jul 2010
Posts: 54
Location: Earth, Europe, Germany @ N 51°43'10.73'' E 14°39'05.52''
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| Posted: Thu Oct 07, 2010 6:34 pm Post subject: |
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| Tim in Phoenix wrote: | Hello
It could be arcing in a tube or from the anode wiring (pink cable going to each tube bell.
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Oh, I don't hope that but I'll check this as soon as I am at home. But why do the failure appears only with higher frequencies?
I'm going to clean the chips and if that doesn't work I'll swap the HVPS.
Greetings from Germany
Freimut
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DGP
Joined: 05 Nov 2008
Posts: 57
Location: Barcelona
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| Posted: Fri Oct 08, 2010 11:20 am Post subject: |
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I had exactly the same problem and after properly cleaning the chips and sockets on the CLM its gone.
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friedwart
Joined: 07 Jul 2010
Posts: 54
Location: Earth, Europe, Germany @ N 51°43'10.73'' E 14°39'05.52''
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| Posted: Thu Oct 14, 2010 9:54 am Post subject: |
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| DGP wrote: | | I had exactly the same problem and after properly cleaning the chips and sockets on the CLM its gone. |
I got the removal tool and cleaned all socketed chips. The failure seems to has gone. Thanks a lot to all who helped me.
Freimut
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