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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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Marcel_D
Joined: 22 Sep 2007
Posts: 54
Location: Canada
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| Posted: Sat Aug 24, 2013 6:16 am Post subject: |
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Ah, excellent. So when the service manual says to start by "Turn VR5004 fully counter clockwise, set all other VRs to center" it's just messin with me? That's how the DEF board service part starts.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sat Aug 24, 2013 6:21 am Post subject: |
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Wait a minute, try it turning back where it was, 'H out' pot is meant for the H-output protection, so it can give false alarm in end position, but it isn't really hard to test if the 2SC4288 is bad, just for sure.
_________________
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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Marcel_D
Joined: 22 Sep 2007
Posts: 54
Location: Canada
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| Posted: Sat Aug 24, 2013 6:24 am Post subject: |
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I tried. I found the adjustment procedure for it too. Says to try and get 2.0V between TP 6 and 7. It's stuck at like 3.4V regardless of the pot's position. Pot is still good, I checked.
Probably the transistor.
Edit:
Yeah it's the transistor.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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Marcel_D
Joined: 22 Sep 2007
Posts: 54
Location: Canada
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| Posted: Sat Aug 24, 2013 6:51 am Post subject: |
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Gotchya. Any idea why it blew like that? Did I follow the service manual incorrectly?
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sat Aug 24, 2013 12:29 pm Post subject: |
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Why the F*** are you touching the H-OUT pot in the first place!!! There are two pots for raster size, neither one says H-OUT....
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Marcel_D
Joined: 22 Sep 2007
Posts: 54
Location: Canada
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| Posted: Sat Aug 24, 2013 7:04 pm Post subject: |
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Because this:
I wanted to go through the whole board and tweak the adjustments.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sat Aug 24, 2013 11:21 pm Post subject: |
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If it was working before i wouldnt have touched that.
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Sun Aug 25, 2013 3:57 am Post subject: |
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| gjaky wrote: | | Replace it only with the same toshiba type. |
I'll second that!! BEWARE of counterfeit transistors, and it MUST be an "A", nothing else.
If you buy the transistor on ebay and it keeps blowing up, it's a chinese fake. Beware, there are a LOT of them out there.
Even from reputable sources.
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This space for rent.
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