CurtPalme.com Home Theater Forum

[Curt Palme]

So I spent a good part of the day working on a Barco 1209s that gave me grief. Just a heads up to not be stupid like me..

I replaced a green tube with one of those bare LUG tubes off eBay. After 2 attempts to avoid glycol leakage (you can never use too much silicone!) it finally was perfect. The green tube with new HV lead worked like a charm. Put the tube back in the previously working set, and I get a scan fail with a pulsing SMPS. Strange, it worked before. After swapping out every board in the set, I found that what the problem was was that I'd added a spring loaded ground lead around the tube as the grounding coating (aquadag) of the LUG tube didn't quite extend as far to the edge of the tube as the old one did. I added the ground wire around the bell of the tube, and it happened to just stick under the yoke..where it was shorting out the H winding of the yoke!

A new yoke and rerouting of the ground lead solved that part.

THen the set had a pix, but it was shifting in focus and had some HV arcing around the HV splitter. I swapped splitters. No change. I saw blue corona around the little PC board on the HV splitter. Very strange. I got the occasional massive arc from one of the HV leads to the PC board. I changed the splitter again. Same thing.

Then I thought maybe there was too much HV, so I swapped the EHT board and the quadrupler. Still arcing and snapping. Changed the G2 board in desperation. No dice.

Finally I removed all tube HV leads from the splitter. No more spitting and arcing. Damn!

Turned out the brand new HV lead from VDC was leaky, right at the end where it went into the splitter. Changed the lead, no problem.

Not sure why I didn't find that at first, I have seen that before on old HV leads. I guess the fact that the lead was new and clean made by brain bypass that.

The end result though was that this 1209s is super nice. All minty tubes, perfect focusing and convergence.

[Curt Palme]

So I spent a good part of the day working on a Barco 1209s that gave me grief. Just a heads up to not be stupid like me..

I replaced a green tube with one of those bare LUG tubes off eBay. After 2 attempts to avoid glycol leakage (you can never use too much silicone!) it finally was perfect. The green tube with new HV lead worked like a charm. Put the tube back in the previously working set, and I get a scan fail with a pulsing SMPS. Strange, it worked before. After swapping out every board in the set, I found that what the problem was was that I'd added a spring loaded ground lead around the tube as the grounding coating (aquadag) of the LUG tube didn't quite extend as far to the edge of the tube as the old one did. I added the ground wire around the bell of the tube, and it happened to just stick under the yoke..where it was shorting out the H winding of the yoke!

A new yoke and rerouting of the ground lead solved that part.

THen the set had a pix, but it was shifting in focus and had some HV arcing around the HV splitter. I swapped splitters. No change. I saw blue corona around the little PC board on the HV splitter. Very strange. I got the occasional massive arc from one of the HV leads to the PC board. I changed the splitter again. Same thing.

Then I thought maybe there was too much HV, so I swapped the EHT board and the quadrupler. Still arcing and snapping. Changed the G2 board in desperation. No dice.

Finally I removed all tube HV leads from the splitter. No more spitting and arcing. Damn!

Turned out the brand new HV lead from VDC was leaky, right at the end where it went into the splitter. Changed the lead, no problem.

Not sure why I didn't find that at first, I have seen that before on old HV leads. I guess the fact that the lead was new and clean made by brain bypass that.

The end result though was that this 1209s is super nice. All minty tubes, perfect focusing and convergence.

[tse]

You wouldn't believe how much brand "new" stuff is bad. A brand new 9500 fresh off the assy line today had horrible noise in the picture. Turn on green only and pull green convergence yoke connector. Cleans right up. Start swapping stuff, LVPS change fixes it. Try another "new" LVPS and noise galore. Whole freaking batch of LVPS are bad. Then there is the focus magnet. You would not believe how many focus at 3% static focus or 89%. Can't ship that. Really bad focus on the sides? The dynamic coil is wired backwards. Assembly and set-up are mainly sorting processes for "new" parts.

Scott

[Elaine Benes]

[Curt Palme]

Hey, that's not very nice!

[Curt Palme]

Hey, that's not very nice!

[Elaine Benes]

[Tom.W]

VDC ain't all bad. At least they still sell CRT's

[Gino]

[Curt Palme]

Well I've sold about 50 of them and that's the first leaky one I had. I can't see VDC actually manufacturing the plastic HV connectors, so it was a manufacturing fault, not VDC's.

Gino, without siliconing the leads to an actual tube and letting it set, I can't check the leads, but of course if there's a problem, I'll send another one out for free.

I think what threw me is that the corona was coming off the edge of the little quadrupler PC board and not from the HV lead itself. That diagnosis of the bad lead should have taken me about 30 seconds, instead for some reason today it took about 3 hours and much swapping of (good) parts.

[Curt Palme]

Well I've sold about 50 of them and that's the first leaky one I had. I can't see VDC actually manufacturing the plastic HV connectors, so it was a manufacturing fault, not VDC's.

Gino, without siliconing the leads to an actual tube and letting it set, I can't check the leads, but of course if there's a problem, I'll send another one out for free.

I think what threw me is that the corona was coming off the edge of the little quadrupler PC board and not from the HV lead itself. That diagnosis of the bad lead should have taken me about 30 seconds, instead for some reason today it took about 3 hours and much swapping of (good) parts.

[Harvey]

When i have more the 1 hour test thing´s and change Part´s and nothing work´s i stop that and do other Thing´s till the next Day and most of the Time then i find the Error in about 10 minutes..