CurtPalme.com Home Theater Forum

robin36mac · Joined: 24 Jan 2009 Posts: 46

Hello everyone !

My BG808 (not S) is starting to Fail (quad likely), I am trying to get a BD808S/E with good tubes working back to put in place (it had no EHT).

I changed the EHT circuitry with an old generation I had in spare (form a 1209 I think)
Quad => R761743
EHT Board => R761742.5 (with modification of the pinout)
Splitter => R7617447

And..It worked !
But the quad tend to arc when too close af the frame... I have a spare R7622091 but doesn't have it right there.
However it works when keeped not too close.

But I have another problem.
When the machine is hot (after +/-1 hour), picture disapeared, and when I tried to power cycle it, I have these LED on the G2/Focus block :
HTHD : Flashing
Conv : Flashing
All other LED green and no Red.
The green on the SMPS sub-board looks like to flash a little (less sure).
And no red light on EHT Board !

But now, the Scan Fail red LED lit.

Without no EHT and Quad connected, problem is identical.
Tried to swap the SMPS and G2/Focus with the BG808, still the same.

If I let the machine cool down, it works agains ! Until it's hot.

I switched the V and H switches and the V looks broken.
I will try to wire it directly.

If you have any ideas :

I think it might be one deflexion board can I swap with the BG808 ones ?
This Barco have good P16 tubes, is there any precaution I can take to avoid a spot burn while playing with deflexion stuff ? (even if internally supposed to be protected)

Thanks !

I'm going to post a video to show the power cycle.

Robin

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Check the 17v on the SMPS when this occurs

robin36mac · Joined: 24 Jan 2009 Posts: 46

I'm running it waiting for the fail, the scope is ready.
Before this, I set the +17V to 17.0V. It was over 18V before.

Video of yesterday : https://www.youtube.com/watch?v=1Pw2dmO2eLI

robin36mac · Joined: 24 Jan 2009 Posts: 46

It now react differently.

This picture is unstable (change of global size) and randomly out of focus, changing from dark to bright (G2 or HT unstable ?), then I hear the HT shutting (=> no picture). The EHT LED remains off, no another red LED, all green ok, just the HT shut.

Looks like my EHT or quad doesn't work right ?

Robin

**Curt Palme** · Posted: Sun May 24, 2015 5:02 pm Post subject:

You have at least two problems in the set. Scan fail issue could be the vertical board, but more likely is the H output board or the SMPS. I'd bet the H board. Your brightness issue is most likely the splitter or quadrupler. I have stock of everything.

robin36mac · Joined: 24 Jan 2009 Posts: 46

Fine,

I will get my last HT spares this next week-end (doesn-t have it right here) and have a look what I have as deflexion boards and I get back to you to check all this.

Thanks !

Robin

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Are you saying this all occured after you adjusted the SMPS?

The issue i have found with my Cine 9 and the 17v adjustment is that on one of my SMPS units it varies alot from black screen to white screen and a little bit from cold to hot. So what i was doing is setting the 17v at abit over 17v with a full white screen up, if i did it the way the book says, it would sag down to 16.2v with a bright screen. If you SMPS has issues coming on, then that could be why it was up that far.

robin36mac · Joined: 24 Jan 2009 Posts: 46

Oh yes it was a bit off, 16,8V...
Set it to 17,2V to let a little marge, but no changement in behavior.

Robin

robin36mac · Joined: 24 Jan 2009 Posts: 46

I checked the tension on the feedback from the splitter, and I have a very wide of voltages... 30 to 19V !

So I swapped this splitter and put back the one that was in place (new style, so) and I get the Red LED on the EHT module on, right away.
(Maybe old Quad was good after all ? oO)

For the H board, can I swap H Board R76226715 with older R7622675 ?

Robin