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joerg
Joined: 07 Mar 2006
Posts: 60
Location: Germany
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| Posted: Thu Aug 09, 2007 3:44 pm Post subject: BG 808S died |
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Hi,
my 808S died the set is dead not even the standby light is on. 
After checking the FAQ I found out that the F100 fuse of the SMPS blew.
I tryed a new one and it blew directly. So something is wrong with the SMPS I guess.
If I look at the structur of the smps I gues that the falt is on the lowvoltage side of the board I mean before the transformer.
When I checked the parts I notised that if I measure the resistance of Q100 and Q101 they differ. The Q100 doesn't show any resistance at all the Q 101 behaves different and in some currrent diretions it shows resistance.
My Question is is that normal or is Q100 defect.
The Board number is R7621706
Joerg
_________________
My Girlfriend thinks size matters and she is right!
Owner of the uglyest Barco 808sLC
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Z-Photo
Joined: 07 Mar 2006
Posts: 2749
Location: Huntsville - Alabama
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| Posted: Thu Aug 09, 2007 4:41 pm Post subject: |
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Also check your capacitors on that -
If not i might know a guy that can fix it..........
_________________
Engineer by Day
Photographer by Night
My Portfolio
The Only GOOD AMPRO - is a Dead AMPRO.
wait - are they not all DEAD already?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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joerg
Joined: 07 Mar 2006
Posts: 60
Location: Germany
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| Posted: Fri Aug 10, 2007 2:41 pm Post subject: |
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Hi I try ì to get the BU2525 FET (Q100/Q101)Mosfet but they are not produced any more.
Does anybody know a substitued?
Joerg
_________________
My Girlfriend thinks size matters and she is right!
Owner of the uglyest Barco 808sLC
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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joerg
Joined: 07 Mar 2006
Posts: 60
Location: Germany
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| Posted: Wed Aug 29, 2007 5:15 pm Post subject: Still not working |
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Hi There,
I replaced the SMPS and the set powered up but I can't get a picture.
When the set powers up it doens't make the normal "HV is powering up"sound.
There are no red lights and everything looks good.
I checked the fuse of the EHT Board and it is fine.
I checked the 17V SMPS voltage and it is fine.
I checked all SMPS fuses and they are fine.
I reseated all boards but the convergenceboard.
If I look at CRTneckboards they are glowing so this is fine to
There is one more thing I noticed the Serial number of the Replacement is the same as the original SMPS R7621706 but on the new one is a sticker on the subboard with a different number R7621705S.
Any advise.
Is there any voltage of the SMPS that can cause this problem I could check these.
Any othere advise would be great.
Joerg
_________________
My Girlfriend thinks size matters and she is right!
Owner of the uglyest Barco 808sLC
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Aug 29, 2007 6:16 pm Post subject: |
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So it's not in scan hold down...
Have you pressed pause. 
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joerg
Joined: 07 Mar 2006
Posts: 60
Location: Germany
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| Posted: Wed Aug 29, 2007 6:39 pm Post subject: |
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| Quote: | | Have you pressed pause. |
Ha Ha
is there any way to check if the EHT board is falty beside a nother working set.
Joerg
_________________
My Girlfriend thinks size matters and she is right!
Owner of the uglyest Barco 808sLC
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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 Aug 29, 2007 7:21 pm Post subject: |
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No.
Three possible problems:
1) SMPS
2) H Shift board
3) EHT board.
All have to be swapped out to check them more or less. Or send them my way.
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joerg
Joined: 07 Mar 2006
Posts: 60
Location: Germany
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| Posted: Wed Aug 29, 2007 7:40 pm Post subject: |
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Curt
you got a pm
Joerg
_________________
My Girlfriend thinks size matters and she is right!
Owner of the uglyest Barco 808sLC
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Alaric
Joined: 17 Apr 2006
Posts: 127
Location: Huntingdon, Cambs, UK
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| Posted: Thu Aug 30, 2007 4:10 pm Post subject: |
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Hi There,
The BG808s Has a different model of power supply to the rest of the 808 range, including the BD808s !
Using a non S power supply will run the projector but the light output is wrong, like 10% of normal...Mine even had a strong red push when i tried it.
I did try and get my board repaired and it seemed a few of the resistors had blown, then the FET was replaced...IIRC the first time i just blew the fuse again, after the FET was replaced (and the resistors again) the PJ's diagnostic lights were on, but firing up blew it again. In the end i got a new (refurbished) PSU and things were fine.
Must some day look at getting the old PSU board fixed or something...
cya,
Lee
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