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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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 Link Posted: Sun Sep 29, 2013 7:48 am Post subject: |
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What the hell happened there??
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CasetheCorvetteman
Joined: 09 Nov 2008
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Mon Sep 30, 2013 5:51 am Post subject: |
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This is only good for up to 70MHz, the transistors in the the VPH06 probably already better than this.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6319
Location: Australia
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| Link Posted: Mon Sep 30, 2013 11:54 pm Post subject: |
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Youre reading the data sheet wrong Gabór
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Tue Oct 01, 2013 6:05 am Post subject: |
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Why? The problem is with the VPH06 that the transistors inside are too slow, right? By changing the output transistors to faster could only mean performance improvement. I don't see what to do with this NTE2501 in this application, this transistor is worse in every key parameters than the 2SC3600 that the OP had originally suggested.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Link Posted: Tue Oct 01, 2013 5:52 pm Post subject: |
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It's very hard to open the vph's chip.
I had to heat the microchip to open it.
Now I would to know other components to do the mod.
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Domenico (Barco fan!)
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Tue Oct 01, 2013 5:54 pm Post subject: |
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The transistors you want to substitute are under the brown shield...
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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zxh398
Joined: 05 Nov 2009
Posts: 55
Location: china guangzhou
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| Link Posted: Tue Oct 08, 2013 1:57 am Post subject: |
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The specific method of modifying IC
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zxh1353@hotmail.com
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zxh398
Joined: 05 Nov 2009
Posts: 55
Location: china guangzhou
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| Link Posted: Tue Oct 08, 2013 2:10 am Post subject: |
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Modified significantly enhance the focus, the subtitles are formed by the scan line
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| Enlarge the screenshot you can see a clear line |
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zxh1353@hotmail.com
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gnnash
Joined: 10 Jul 2013
Posts: 216
Location: Lake Elmo, MN
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| Link Posted: Mon Apr 07, 2014 5:42 pm Post subject: |
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I'm very curious... has anyone other than zxh398 actually succeeded in this mod? The ICs seem to be quite easily available on ebay...
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Mon Apr 07, 2014 6:07 pm Post subject: |
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| gnnash wrote: | | I'm very curious... has anyone other than zxh398 actually succeeded in this mod? The ICs seem to be quite easily available on ebay... |
-These ICs are very fragile inside, easy to ruin while you want to disassemble, needs delicate skills.
-The suggested 2sa106/2sc3600 transistors are hard to find, while no one seems to have experience with the NTE replacement.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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digitalayon
Joined: 02 Mar 2009
Posts: 921
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| Link Posted: Mon Apr 07, 2014 6:21 pm Post subject: |
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Man....wonderful....simply wonderful.
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gnnash
Joined: 10 Jul 2013
Posts: 216
Location: Lake Elmo, MN
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| Link Posted: Mon Apr 07, 2014 8:26 pm Post subject: |
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| gjaky wrote: | | gnnash wrote: | | I'm very curious... has anyone other than zxh398 actually succeeded in this mod? The ICs seem to be quite easily available on ebay... |
-These ICs are very fragile inside, easy to ruin while you want to disassemble, needs delicate skills.
-The suggested 2sa106/2sc3600 transistors are hard to find, while no one seems to have experience with the NTE replacement. |
Hmm... the transistors both seem to be available for purchase on eBay, in the US anyway.
I would be interested in buying a spare neckboard to try this on, if only the instructions were a bit clearer about what exactly was going on, or included schematics of the actual mod.
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