| Author |
Message |
gabriele
Joined: 04 Feb 2008
Posts: 4
|
| Posted: Mon Feb 04, 2008 9:39 am Post subject: Barco BG800 tubes off an on |
|
|
Hi everybody,
I'm an italian owner of a Barco bg800, buyed used a couple of weeks ago.
I'm setting it up and trying to get a great picture from it, but I've a "little "problem:
after a while (1 hour or less) the three tubes switch off, stay off for a while (in order of minutes) an then light up again.
This occurs many times, but I can't see an exact rule. (the error led light up).
I cannot ear any strange "frying" from the projector, when the tubes ar on, maybe a very little one before the problem occurs, but not easy lo localize, maybe from the line quadrupler.
The projector is connected thru input 5 to an HTPC at 1024x768 50Hz, and when on, the image is great, but a little dark (but my set up is absolutely not optimal).
Please help me because I like it very much.
Tank you all
Gabriele
p.s. Sorry for my english
Last edited by gabriele on Wed Feb 13, 2008 3:44 pm; edited 1 time in total
|
|
| Back to top |
|
 |
BurnerX
Joined: 04 Feb 2008
Posts: 4
|
| Posted: Mon Feb 04, 2008 10:36 am Post subject: Re: Barco BG800 |
|
|
| gabriele wrote: | Hi everybody,
I'm an italian owner of a Barco bg800, buyed used a couple of weeks ago.
I'm setting it up and trying to get a great picture from it, but I've a "little "problem:
after a while (1 hour or less) the three tubes switch off, stay off for a while (in order of minutes) an then light up again.
This occurs many times, but I can't see an exact rule. (the error led light up).
I cannot ear any strange "frying" from the projector, when the tubes ar on, maybe a very little one before the problem occurs, but not easy lo localize, maybe from the line quadrupler.
The projector is connected thru input 5 to an HTPC at 1024x768 50Hz, and when on, the image is great, but a little dark (but my set up is absolutely not optimal).
Please help me because I like it very much.
Tank you all
Gabriele
p.s. Sorry for my english |
If tubes go totally off and also flyback transformer sound disappears I think problem is on power card. Check you status leds on power card and you can get service manuals from http://www.lynxxx.nl/barco/downloads.asp.
I think good point to start is that power supply card capacitors are not leaked or exploded. Also try take off all cards and put them back.
|
|
| Back to top |
|
|
gabriele
Joined: 04 Feb 2008
Posts: 4
|
| Posted: Mon Feb 04, 2008 11:59 am Post subject: Re: Barco BG800 |
|
|
| BurnerX wrote: | | gabriele wrote: | Hi everybody,
I'm an italian owner of a Barco bg800, buyed used a couple of weeks ago.
I'm setting it up and trying to get a great picture from it, but I've a "little "problem:
after a while (1 hour or less) the three tubes switch off, stay off for a while (in order of minutes) an then light up again.
This occurs many times, but I can't see an exact rule. (the error led light up).
I cannot ear any strange "frying" from the projector, when the tubes ar on, maybe a very little one before the problem occurs, but not easy lo localize, maybe from the line quadrupler.
The projector is connected thru input 5 to an HTPC at 1024x768 50Hz, and when on, the image is great, but a little dark (but my set up is absolutely not optimal).
Please help me because I like it very much.
Tank you all
Gabriele
p.s. Sorry for my english |
If tubes go totally off and also flyback transformer sound disappears I think problem is on power card. Check you status leds on power card and you can get service manuals from http://www.lynxxx.nl/barco/downloads.asp.
I think good point to start is that power supply card capacitors are not leaked or exploded. Also try take off all cards and put them back. |
Thank you, sure I'll check it.
I remember another thing, when tubes are off, the dim light inside the tube is on.
Gabriele
|
|
| Back to top |
|
|
BurnerX
Joined: 04 Feb 2008
Posts: 4
|
| Posted: Mon Feb 04, 2008 1:24 pm Post subject: Re: Barco BG800 |
|
|
Thank you, sure I'll check it.
I remember another thing, when tubes are off, the dim light inside the tube is on.
Gabriele[/quote]
Do you mean that yellow light what you see inside barco (heater glow) or do you mean colored light what you see inside tube when you look to lens?
Also check you red cables from HV unit to focus board and to tubes. If these cables are damaged they can hit voltage to ground and then maybe you hear ZAP just when it make failure.
Caution it is very high voltage on the red wires(37 000V ?). They can give strong shock for you even several minutes after taking power cable away. So don't kill your self with it 
|
|
| Back to top |
|
|
gabriele
Joined: 04 Feb 2008
Posts: 4
|
| Posted: Mon Feb 04, 2008 1:29 pm Post subject: Re: Barco BG800 |
|
|
Do you mean that yellow light what you see inside barco (heater glow) or do you mean colored light what you see inside tube when you look to lens?
Also check you red cables from HV unit to focus board and to tubes. If these cables are damaged they can hit voltage to ground and then maybe you hear ZAP just when it make failure.
Caution it is very high voltage on the red wires(37 000V ?). They can give strong shock for you even several minutes after taking power cable away. So don't kill your self with it [/quote]
I mean the dim light inside the tube, near the socket, at the end of the tube neck.
|
|
| Back to top |
|
|
gabriele
Joined: 04 Feb 2008
Posts: 4
|
| Posted: Wed Feb 06, 2008 9:15 am Post subject: Re: Barco BG800 |
|
|
| gabriele wrote: | Do you mean that yellow light what you see inside barco (heater glow) or do you mean colored light what you see inside tube when you look to lens?
Also check you red cables from HV unit to focus board and to tubes. If these cables are damaged they can hit voltage to ground and then maybe you hear ZAP just when it make failure.
Caution it is very high voltage on the red wires(37 000V ?). They can give strong shock for you even several minutes after taking power cable away. So don't kill your self with it |
I mean the dim light inside the tube, near the socket, at the end of the tube neck.[/quote]
Yesterday night I pulled out the SMPS board and the Horizontal output board and retouched some bad solders, also I retouched the trimmer to read the 17 volt. I left the projector on for 2 hours and more with a film. The tubes were always on, but after half an hour, the image became to expand in all direction losing focus and brightness, and then returned to its original dmension with all parameters ok.
During all the 2 hours the led on the horizontal output board was always dimly lit.
I had to retouch the trimmer several times to read 17 volt, during this test, in fact the value on the tes point tend to fall down.
That's all
Gabriele
|
|
| Back to top |
|
|
Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
|
| Posted: Wed Feb 06, 2008 9:26 am Post subject: Re: Barco BG800 |
|
|
| gabriele wrote: | | The tubes were always on, but after half an hour, the image became to expand in all direction losing focus and brightness, and then returned to its original dmension with all parameters ok. |
www.curtpalme.com/Troubleshooting_Tips_Barco7.shtm
| gabriele wrote: | | During all the 2 hours the led on the horizontal output board was always dimly lit. |
I have seen this in many fully working 80* series Barcos, so I think it's normal.
|
|
| Back to top |
|
|
uhx
Joined: 22 Aug 2009
Posts: 10
Location: Germany
|
| Posted: Tue Sep 14, 2010 8:07 pm Post subject: |
|
|
Hi all,
I've a problem with my Barco Data 801s, similar to the one described here before. After 1-2 hours of operation the picture starts pumping in size and brightness every few minutes for about 10 seconds. When operating the projector for some more time, picture starts growing, losing brightness and focus and all three tubes finally go black. Since I can here the HV sizzle (like when switching off the projector) I think that the HV breaks down. After a few seconds HV comes back and the picture returns to its original size and brightness. And after a few minutes, the same happens again and again...
There are no red LEDs lit during this inside the projector. This happens with a 720p signal on input 5 as well as with the internal test pattern.
Does anyone have a clue, what might be the reason for this?
Thank you,
Ulli
|
|
| Back to top |
|
|
Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
|
|
| Back to top |
|
|
uhx
Joined: 22 Aug 2009
Posts: 10
Location: Germany
|
| Posted: Wed Sep 15, 2010 8:13 am Post subject: |
|
|
Great! Thank you.
Next question: Is there any way to find out which board is bad, without sending them in?
|
|
| Back to top |
|
|
Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
|
| Posted: Wed Sep 15, 2010 10:27 am Post subject: |
|
|
Because it's older EM projector, it's most likely EHT board.
Curt probably can sell one for you, it could be cheaper than sending boards back and fort to repair from Europe.
|
|
| Back to top |
|
|
uhx
Joined: 22 Aug 2009
Posts: 10
Location: Germany
|
| Posted: Thu Sep 16, 2010 9:42 pm Post subject: |
|
|
|
Ok, I plugged in another EHT board and it at least works. Now let's see if it still does after 2 hours...
|
|
| Back to top |
|
|
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Thu Sep 16, 2010 10:26 pm Post subject: |
|
|
No, when you're dealing with high voltage, things have to be tested at that voltage. An ohmmeter or a scope won't help in these cases.
Believe it or not, the EHT board is the HARDEST to repair due to the sensing circuits. I've spend dozens of hours trying to figure out the regulation circuit on the EHT board, and it's a royal pain. I still have about 6 boards here that I can't get going...
|
|
| Back to top |
|
|
uhx
Joined: 22 Aug 2009
Posts: 10
Location: Germany
|
| Posted: Thu Sep 16, 2010 10:29 pm Post subject: |
|
|
|
Oh, I "tested" it at high voltage, because I plugged it into the projector and the projector works
|
|
| Back to top |
|
|
uhx
Joined: 22 Aug 2009
Posts: 10
Location: Germany
|
| Posted: Sat Sep 18, 2010 9:31 pm Post subject: |
|
|
| Ile wrote: | | Because it's older EM projector, it's most likely EHT board. |
Obviously you were right. Changing the EHT board fixed it  Thank you again for your help.
|
|
| Back to top |
|
|
|
|
