CurtPalme.com Home Theater Forum

Axel87 · Joined: 26 Jun 2010 Posts: 22

Hello all,

I have been given a Barco 801 and in the process of repairing it.
I was told that "a diode was burnt out on the green card" and it would be a simple fix.
The only problem is that I am starting this project with a moderate knowledge with electronics and a amateur knowledge with video/projectors.
I was hoping that there would be someone in this forum that is knowledgeable with these units and could guide me through the troubleshooting and repair of this process.
I do have a service manual for this product along with some other materials that I was also given.
If I turn on the unit, it powers up, but after a minute or so, the fans turn off and the LED on the back goes red. I am assuming this is because I have no input into the unit?
I would have to start and the basics of this product, as I have no knowledge of this, I am stuck on even how to connect this to a computer. I am assuming that I will need a VGA to 5 BNC and dual monitor this, is this correct?

If there is anyone interested in helping me, please respond.
I would may consider paying what I can for some expert help. I have read that these a still valuable, which did surprise me, these things are a tank.

Thank you

**Curt Palme** · Posted: Sat Jun 26, 2010 5:31 pm Post subject:

A shutdown after turnon can be any number of problems, I think you were given misinformation by the previous owner, as a blown diode on the green card won't to my knowledge do the shutdown thing.

A scan fail will, and that's most likely what's bad, or the power supply has a problem.

The best thing to do is read the main site thoroughly, as I've got piles of information there:

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

If you're stuck, I can test and repair boards here for you. Repairs are cheap since the pricing of sets is cheap now.

While the 801 is a good set if the tubes are good, it's not really worth anything at this point. I'd run it at 1080i or 720p depending on the hour count once you get it running.

Axel87 · Joined: 26 Jun 2010 Posts: 22

Thank you for your reply curt!

I have read a little on your site since my last posting, and according to your troubleshooting section the crts will remain off if there is no input.
I have not hooked up anything to the unit yet, as I haven't purchased a VGA to 5 bnc and I do not have a way to connect Svideo to it yet.
I am going to assume at this point the power is ok because of this fact, but please let me know if I am wrong.
Can you give any more hints or offer a path for me at this point?
Also can you send a link for you repair prices or respond with pricing?
Thank you

Axel87 · Joined: 26 Jun 2010 Posts: 22

Hello again,

Sorry for such a long absence, finally warm enough here to work on this again.

I have printed off all of your tech guides and troubleshooting tips and have tried to follow word for word.

So far this is what I've come up with, hopefully you excuse my absence and lend a hand again! Smile

I have unit hooked up via my laptop VGA to 5 BNC. My SVideo port does not work on my laptop. I should try a DVD player, but am sure I have video output because I hooked the laptop up to a secondary monitor.
The unit seems to pulse and go into standby with red LED. When pulsing the HTHD LED pulses with the unit.
I have tried to pull the cards as instructed to verify any shorts, to no avail. I checked and double checked the fuses on the power supply and also the secondary 7. All test fine.
I tried pulling all Red tubes to see if it was a shorted tube, no change.
I do have the huge service manual for this unit also, I read through it a bit but could not find any clues to my problems.

I could also add that when I recieved this unit it came with a package of Phillips BF423 pnp transistors. I do not know if this could be any indication that someone had diagnosed the problem or not. Were are these used?

Any help would be greatly appreciated!
Thanks

**Curt Palme** · Posted: Wed Jun 08, 2011 2:39 am Post subject:

Check the yellow lights on the side of the set, on the focus board. While the set is running, are they solid, or do they pulse?

I've never had to change any of those transistors, I don't even know what board they are on. Probably not the video output boards, since the main piece on that board is a chip. Smile

Also, see if the red scan fail light is on or off.

As I sort of said above, the set will stay on with or without a signal, so the set shutting down has nothing to do with a lack of signal. Also make sure the laptop outputs negative sync, as the Barco will not accept a postive sync signal (but it won't hurt the projector, you just won't get an image.

Most likely problem areas:

-SMPS (power supply)
-H board
-V board.

You can also pull th econvergence tray from under the lenses, the set will run without it. If there's a short on that board, it can shut the set down, but I doubt that's it.

I'm blowing out 801 and 800 modules for dirt cheap, so you can most likely buy an H and V board for less than it is to repair them.

Axel87 · Joined: 26 Jun 2010 Posts: 22

Thanks again for the quick response!

When the unit is initially turned on all yellow lights are on, then the HTPT light flashes and the unit pulses on/off again and does this 3 or 4 times before turning off completely.
The SF light does not stay on after unit turns off, but it is light with the yellow lights during the initial on/off and pulse.
According to your troubleshooting manual, if the problem lies in the H or V boards, when I remove them wouldn't the unit run normally?

Thanks again!

**Curt Palme** · Posted: Wed Jun 08, 2011 4:23 am Post subject:

No, the unit will sense that the H or V output isn't working, and it will shut the set down. I don't think I can narrow it down any further than the three boards I listed above without seeing them. If you get stuck, i can test and repair them, I've done dozens.