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mkamp50
Joined: 03 Jul 2008
Posts: 13
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| Posted: Sun Mar 29, 2009 8:39 pm Post subject: Barco 1208 with repaired SMPS - no HV |
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Just put in the repaired SMPS board. The projector powers up but no high voltage. Scan Fail led on. HTHD and +CONV leds off. Tubes glow. Now what to try?
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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: Mon Mar 30, 2009 1:24 am Post subject: |
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Either your H width is set incorrectly on the SMPS, or the H or V boards are bad.
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markus76
Joined: 01 Aug 2010
Posts: 5
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| Posted: Sun Aug 01, 2010 6:13 pm Post subject: Re: Barco 1208 with repaired SMPS - no HV |
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| mkamp50 wrote: | | Just put in the repaired SMPS board. The projector powers up but no high voltage. Scan Fail led on. HTHD and +CONV leds off. Tubes glow. Now what to try? |
I have exactly the same problem with my 1208...
Could you please let me know what has been wrong on your 1208???
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Sun Aug 01, 2010 6:48 pm Post subject: |
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| Curt Palme wrote: | | Either your H width is set incorrectly on the SMPS, or the H or V boards are bad. |
Listen to Curt....
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markus76
Joined: 01 Aug 2010
Posts: 5
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| Posted: Sun Aug 01, 2010 6:55 pm Post subject: |
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| Tom.W wrote: | | Curt Palme wrote: | | Either your H width is set incorrectly on the SMPS, or the H or V boards are bad. |
Listen to Curt.... |
Iīve set H-width to lowest possible on SMPS
Iīve also bought and tried a new (used but OK) H-board already. Nothing changed.
So V-board? I donīt want to spend another 200 bucks on this machine not being sure thatīs it...
Other suggestions?
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Sun Aug 01, 2010 7:50 pm Post subject: |
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Check the fuse on the EHT module and if you have a spare quad try it. Just realized this is another question on what sounds like a different issue...
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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: Mon Aug 02, 2010 1:37 pm Post subject: |
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| markus76 wrote: |
Iīve set H-width to lowest possible on SMPS
? |
That's the completely wrong way to do it! 
The master width control needs to be set somewhere around 70-80% of the max rotation (usually).
The 1208 has a very tight window where the scan fail light goes out and you get a picture. Too low or too high will trigger teh scan fail light, and you'll get no picture. you might have other problems in the set, but probably not. It's also possible that the SMPS was not repaired correctly, and it still has issues causing a scan fail. Who repaired it, and was it tested in a known working 1208 before it was put into your set again?
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markus76
Joined: 01 Aug 2010
Posts: 5
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| Posted: Mon Aug 02, 2010 5:40 pm Post subject: |
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Thanks for your replies and help...
First of all: Fuse on EHT is OK, also tried another EHT board, same issue.
Then iīve changed the quadrupler. Nothing changed.
Boards/parts come out from a BG800 with burnt tubes with low hours.
Iīve repaired the SMPS myself. All semiconductors on primary side have been changed, capacitors and resistors have been changed if they were out of spec. Both BUP 101 have been changed to BU2525AW (like described in Barco FSB 15 or 16)
On secondary side one diode has been changed inc. capacitor
On sub unit all semiconductors involved in HTHD regulation circuit have been changed (after the set powered up again and the failure described above came up - to rule out the SMPS). Resistors and caps checked/changed where out of spec.
I have no chance to test the SMPS in another set... too bad.
Because of Curts hint i decided to buy a used but declared as OK H-board (from sierracircuits - donīt remind me of the problems i had with customs *arrggghhh*).
Iīve now tried to set h-width as Curt described above (and of course a little up and down). No change. Green LED on SMPS Sub is on but no HTHD or CONV+ LED on G2-board....
scan fail always on.
Red LED on V-board comes up when set is powered on from standby, goes out and then comes up a few seconds (approx. 10-15) later and stays on.
Red LED on H-board is very dim lightening.
Control panel shows no error, Block match-LED is on...
Any other suggestions so far???
Thanks again for your help!!!
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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: Tue Aug 03, 2010 12:59 am Post subject: |
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Without seeing the boards here, I'm not sure what is going on.
-another problem on the SMPS
-you didn't repair the SMPS correctly.
-bad G2 board
-bad H output board
-other issues in the set.
Sorry, to take it further at this point you'll need to send me some of the boards to check in a working set here.
Cheers!
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markus76
Joined: 01 Aug 2010
Posts: 5
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| Posted: Tue Aug 03, 2010 7:12 pm Post subject: |
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Hello Curt!
Thanks for your reply and your help! Things would be much easier if i lived in the US...
Only shipment of all these boards will cost ~ 150 Euros. Not even thinking about the problems i will have with customs when they come back...
Do you remember what the problem has been with mkamp50īs (threadstarter) boards??? Itīs obviously the same problem...
Too bad he didnīt post the solution of his problem...
So if anyone has an idea what could be wrong - feel free to post, any answer or hint is appreciated!
Thanks so far guys!!!
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huggy
Joined: 02 Aug 2008
Posts: 927
Location: Melbourne,Australia
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| Posted: Tue Aug 03, 2010 8:38 pm Post subject: |
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This sounds exactly like the problem I had with my 1209s. I had the smps repaired by Curt and pj still wouldn't turn on.
Finally had someone come over with a G2 board which solved the problem,so in the end it was a combination of both boards that took out my pj.
If you can't afford to send the boards to Curt,try and source some locally even if it means temporarily just to diagnose the problem.
Dave
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Tue Aug 03, 2010 8:44 pm Post subject: |
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Guess it could be the G2 board. Now I remember your thread...
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markus76
Joined: 01 Aug 2010
Posts: 5
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| Posted: Wed Aug 04, 2010 8:56 am Post subject: |
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Since you both think it could be the G2-board iīll check this one next. Hope i find the failure...
Do you still remember what the problem on the G2 has been???
Thanks again for your help - and keep on posting advices!!!
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huggy
Joined: 02 Aug 2008
Posts: 927
Location: Melbourne,Australia
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| Posted: Wed Aug 04, 2010 9:33 am Post subject: |
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I don't know what the problem was with the G2 and am not sure whether the G2 took out the smps or the other way around.
Curt did the repair on the G2 as well but I doubt he'd remember it.
Also keep in mind the horizontal width pot on the SMPS should be in the same location or close enough to it's original position
before you repaired it. It has a sweet spot as Curt mentioned, too high or too low will not yield an image.
edit: I remember going over the G2 before I shipped to Curt and the meter showed one of the resistors had blown.
Dave
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