CurtPalme.com Home Theater Forum

graekynn · Joined: 22 Jul 2010 Posts: 5

**UPDATE 15/11/11**

Well, ive replaced the EHT board, still the same issue. Looks like a replacement quad is in order. I would like to locate a R7622091 EHT Quadrupler. If anyone has one they want to sell please email me at graekynn@live.com. Thanks!!

Hi All,

Im hoping someone can help me narrow down this fault. I have a barco 808s projector that isnt displaying anything at all, regardless of the source.

I initially had an issue with source 5 (RGB) not displaying but source 1 (composite) worked just fine. I emailed Curt about it recently and he pointed me towards a possible faulty RGB switcher card. I managed to find a spare lying around and stuck it in, and for a brief period it solved the issue. I had a hdmi source fed though a HDFury module that worked just fine, for about 30 seconds.

The image just disappeared like someone had yanked a cable, and i may have heard a pop coming from within the projector. I inspected all the boards looking for a blown component, but nothing could be found. So, I tried powering on the projector again, and there are no red LED's on any boards (except the normal red LED's on the RGB switcher board and H board when a source is not present). The G2 diagnostic row of green LED's are all lit, and the red one is not lit. The diagnostic board inside the cover shows normal power and flashing processor cycles with no error LED lit.

Normally, I can see some flickering or something coming from the tubes even when no source is displaying (its done that since i first bought it, hoping thats normal too :S) but I looked directly into the tubes and saw nothing, they are blank just as if the unit isnt on.

I inspected the tubes and when the unit is powered on they do glow near the neck boards (the heating coils?) so im assuming they are getting power. The tubes are also quite young ~2000 hours use.

Ive read the troubleshooting section and it refers to a rare instance where the H board can cause a no picture symptom without a fail LED being lit, but it didnt sound to confident. According to troubleshooting, the H & V boards as well as the SMPS are the prime suspects, but are supposed to trigger a fail LED. I would like to know if a faulty Quadrupler could cause the same issue. If anyone has experienced this before and has any steps I can take to troubleshoot further. Unfortunately my known good spares for this model are rather limited.

If I have omitted anything that may be relevant please let me know. Ive tried to diagnose this to the best of my ability but still nothing, any help would be greatly appreciated!

Many thanks,
Dave.

**Curt Palme** · Posted: Mon Oct 31, 2011 2:33 am Post subject:

Did you check the red LEDs on the EHT board? I'll bet one or both are on, indicating HV shutdown. A POP from the set almost always means HV issues.

graekynn · Joined: 22 Jul 2010 Posts: 5

Yes sir, there is indeed a red LED lit on that board! I thought i checked it, but must have missed it. I checked the pins on it, there is no evidence of arcing, and checked the fuse (could only find one, but tips refers to two) and it has continuity and is clean. So that means the EHT board, Quadrupler or HV splitter are the suspects now, and the only way to troubleshoot is to swap them out one by one?

unless there is a more likely culprit that the other i would obviously want to replace the cheapest component first and so on, however i did replace the quad a few years ago.

how should I proceed?

EDIT - the EHT board looks like the older style board and has the part number R7617427, if it did need to be replaced, is the newer style better in any way or more reliable?

secstate · Joined: 20 Mar 2006 Posts: 720

I'd bet your quad had gone again. They appear to be the least reliable of the HV components and you don't want to mix a newer EHT board with an old quad as they don't play well together. Also if the set is not designed for a newer EHT board you will need to mod the board the get it to work but you'd still have to use a new style quad which are harder to find and appear to be less reliable than the older style quads.

**Curt Palme** · Posted: Tue Nov 01, 2011 5:34 am Post subject:

No, the old style quad works fine with a new EHT, it's a new quad that won't work with an old EHT/

I am out of stock of quads for the 808, not sure when I'll get more in right now.

graekynn · Joined: 22 Jul 2010 Posts: 5

No worries, I managed to source an EHT board to do some testing as it was the cheapest component, im 50/50 if it is the cause of the issue as I also have a feeling it may be the quad. Strange question, but do the EHT boards normally have a rattle? Its hard to decribe but when i handle the card if i move it from side to side i can hear something physically moving. At first i thought it was just the fuse, but when i inspected it, it looks like its in there pretty tight and wouldnt budge. Could it be a busted component, or is this normal, like a relay or something?

Ill keep you posted on the progress with the replacement eht board, but in the interim, if anyone has any R7622091 quads they are willing to sell please email me on graekynn@live.com

thanks!

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Not sure what your hearing but my bet is a failed quad....

http://www.curtpalme.com/docs/BarcoServiceBulletin_R762716_New_EHT.pdf

graekynn · Joined: 22 Jul 2010 Posts: 5

Well, ive replaced the EHT board, still the same issue. Looks like a replacement quad is in order. I would like to locate a R7622091 EHT Quadrupler. If anyone has one they want to sell please email me at graekynn@live.com. Thanks!!

graekynn · Joined: 22 Jul 2010 Posts: 5

you fellas were right on the nose. Replaced the quad, projector lives again Smile

thanks again for your help!