Barco Data 800 problems! Please help!

[to_shine]

Dear fellow Barco users,

I have some weird problems with my BD800. I hope that I can
describe them sufficiently well. Please forgive me for my crappy
English. I live in Sweden. BTW, this is my first thread here.



Problem 1.

With the "genlocked pattern" visible, the focus of the green tube
is varying...! The test pattern continuously goes
from being fairly sharp to depressingly blurry and this happens
over and over again. However, the phenomenon is not periodic or
consistent, so one can see everything from sudden jumps from a
sharp pattern to a blurry pattern to a smooth transition between
the two. The same thing happens with the "internal # pattern".

I know that there is electronic focusing on BD800. Is this the
problem...? I don't get any error lights or messages when this
happens.


Problem 2.

The BNC chassi connectors for RGB+sync are quite bad (I sometimes
lose the picture, so the sync is most problematic). How do I
change them? I don't know which way I should take. Past the
"permanent RCU" or the back plate on which the connections sit. I
hope it's easy...!


Problem 3.

Sometimes the projector stops responding. The picture is OK (as OK
it can be with varying green focusing! ), but the only way to
fix the problem is to switch it off and on with the main switch.
After a restart the following lights are lit: "main power", "stdby
power" and "block match". "Processor cycles" flickers. I guess
that this is the normal state? When it stops responding, the
following lights are constantly lit: "main power", "stdby power"
and "rcu". All the others are off.


Problem 4.

The last one...! Good heavens! Sometimes when I press "Adjust",
the menu that is supposed to appear gets extremely distorted while
one still can make out the picture in the background, which was
showing before "Adjust" was pressed. The distortion is best
described as a green/pink/purple mess, i.e. similar to the worst
kind of interference you can think of. There is no chance that you
can see or use the menu. The distortion goes away as soon as I
press "Adjust" again. But if I again try to access the menu, it's
the same problem. The only way to fix it is to restart the
projector.

While the distortion is showing one can clearly hear "electric
crackling" close to the power supply, I guess. Close to this
position, there are 7 lights on the side (good explanation, right!
) and "220 V" is clearly written. The following lights
are on: "+9V", "-17V", "+30V", "+230 V" and "HTHD". "Scan fail"
and "-8V" are off. Is this normal?

No error indicators or unusual lights are shown when the
distortion appears. Everything seems to be OK.

What's wrong! HELP!


I use iScan Pro + 10 m VGA->VGA + 1.5 m VGA->5 BNC.

[Mad Mr H]

Sounds like you have a board going to "short" and pulling the -8v line down - (bad board kills -8v - better English!)

If you are using BNC rgbhv on an 800 then you should try the port 3 - much better for that type of input.

there is a chance issue 1 and 4 are linked....

OR issue 1 could be neck card not on tube firmly or a break in the red HV wire at the tube end....as well as others possibles....

[Mad Mr H]

issue one could also be focus block as well....

BUT the PSU issue is the obvious place to start working on...

though I cant tell you what to do next....sorry.

[cosaw]

Hi there,

The most siginificant factor seems that your -8v led is not lit. Scan fail not normally being lit is correct. The -8v led should be lit yellow though. As to what this indicates I'm not sure and would have to look what part of the pj the -8v is related too. Theres a chance that the led could be dead but I doubt it. To check this you'd need to swap in another focus board or check the led seperately. I'm guessing the problem could be power supply related with the -8v not being achieved and this could be causing all your other issues. Suppose a spare power supply and/or focus board might be useful in diagnosis.

[cosaw]

Whoops didn't see that MrH had already answered this

[to_shine]

Dear cosaw and MadMrH,

thank you so much for your input!!

So, if I understand you correctly, the power supply might be OK and it's in fact one of the boards which is the true problem?

Then I should first try with another focus board...? Well, maybe I can buy a power supply as well...

If I don't see any other suggestions, I will try this ASAP. I just have to find the parts.

Thanks again!

[to_shine]

BTW, how do I use input 3, i.e. how do I go from VGA to that connection...? A simple adapter? Don't even know what it is...! TTL? I'm stupid, I know!

[Barcoing Mad]

Goto crtprojectors.co.uk and find out how to wire port 3.

[cosaw]

So, if I understand you correctly, the power supply might be OK and it's in fact one of the boards which is the true problem?

From what MrH said the way I understood it is the other way round and that you should start on the PSU first:

BUT the PSU issue is the obvious place to start working on...

[to_shine]

OK! I will try that then. I must have misunderstood something!

Thanks again!

[to_shine]

A short update: yesterday I removed the PSU module and used
"electronics spray" (????!), i.e. something to clean the contact
surfaces. After that, the -8 V light was on, but just for 10 min
or something.... I will definitely try with a fresh power supply.

I got a tip to do the same thing with the focus/G2 pots (not
screen). Actually someone has used a huge amount of spray there
already... A bit worrying.

This morning I got a "I2C error" just during a few seconds. It
said something about an address as well, but it went away too
quickly.

Is this related to the power supply issue?

[cosaw]

The I2C error is worth noting if it comes up again. It indicates a harware failure and will point you to a specific chip on a board that could be faulty.

[to_shine]

Now and then, I2C Error, Address: 64H, appears. It's only visible a couple of seconds each time. What does this mean? Could this issue be related to a bad power supply?

Please help!

[Mad Mr H]

IC2 error is part of the convergence board.

the LARGE board that slides in under the lenses.

It IS possible to run your projector without this entire board in place! that will prove it is not causing the power failure issue.

The IC2 error 64H refers to ONE chip on the convergence board that has gone bad and needs to be replaced. the board labels each IC so you need to look for which one that is FIRST.....dont bother to replace it yet as I think the other errors need to be fixed first.

ALSO BD800 series suffer from dry joint on the power supply board the SMPS...

PLEASE go to www.curtpalme.com and read ALL about your projector...there is loads of info their about it and the dry joints are a KNOWN failure on that model.....

http://www.curtpalme.com/Barco500.htm

That would be a good start.

I suggest the dry joint as the SMPS seems to now be intermitant.....

By the way (btw) you dont need to beg for help here!

We are all CRTers and will do out best to help you.....sometimes this takes a bit of time......

[to_shine]

OK, sorry then. I will never say please again... Since I think
that I get answers incredibly fast (I'm very impressed by all of
you! ), I wasn't refereing to that.

But thank you very much MadMrH! I tried what you wrote, i.e. I
removed the convergence board. The -8 V led was still off...

So, let's hope that all this is due to the faulty SMPS... I will
also try with a new focus module when I install the new SMPS. If
replacing these two modules doesn't help, I think that I will give
up and contact a company that can fix my projector for me.

BTW, I also got a tip about the quadrupler (spelling=?!) and that
it could cause some of these issues... I don't know... What do you
think?

One last thing, which I read on
http://www.curtpalme.com/Barco500.htm. If I get it right, all leds
on the controller/cpu board should be green? All mine are red...

I will inform you of any progress.

Thanks again!