CurtPalme.com Home Theater Forum

Gerbrand · Joined: 13 May 2008 Posts: 199

Hello,

I have been fighting an HV problem in my BG1209s for the past few weeks. It all started with a few HV cracks.

I thought I saw arcing at the blue HV boot. I had an HV problem at that location when I retubed earlier this year, so I proceeded to reglue the HV lead.

Tonight I tested the set again, having allowed the silicon to cure for three weeks. The results were rather unsettling, to say the least...

After a few seconds there was a crack again. The blue picture disappeared. So I decided to remove the blue HV lead from the splitter. I started the projector again and immediately had two more arcs.

It looks like the splitter is acting up. This may also explain the blue brightness variations I had been suffering from before this all happened.

Is there anything more to test? Or should I just try to find a splitter, which is getting increasingly hard. Could I have ruined my blue LUG in the process?

Thanks,

Gerbrand

**Curt Palme** · Posted: Sun Nov 06, 2011 2:06 am Post subject:

On a very rare occasion, the EHT board can go to 45Kv+ when the feedback loop from the splitter stops working, or when the EHT board fails in a manner that it can't regulate the HV.

Over the years I've had two, one in a 708 and one 1209 EHT board that would shoot way over the 34Kv mark. Each board would shut the HV down. In the 708 case, the green tube cracked before I realized what was going on.

In your case, I would get a HV probe and check the HV with the tubes disconnected. You could have a simple arc, a breakdown of the HV splitter, but I would not risk $1200 tubes at this point.

Check your HV first, do not connect the HV tube leads until you know what that's at.