CurtPalme.com Home Theater Forum

lighter76 · Joined: 23 Aug 2009 Posts: 9 Location: Germany

Hi,

I am driving a Marquee 8500. After repairing the LVPS and Vertical Board (replaced) AND changing the green tube, I now have a line in the middle of the screen which is shown by every tube.

I also checked if the line is shown whith a fresh "recall" channel, and the line is there very lightly but not sharp due to the missing convergence. Once I have done the convergence, the line could be seen on a white screen.

As I am sure that this is no mask, do you think that this issue can come by the new vertical board? Did anyonme else have the same problem?

Thx for helping me.

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

odd, never heard of, post a picture please.

**Curt Palme** · Posted: Sun May 08, 2011 10:22 pm Post subject:

If the problem wasn't there before you worked on the set, I'd suspect the V board. I can't see it being the LVPS.

lighter76 · Joined: 23 Aug 2009 Posts: 9 Location: Germany

Hi,

after surfing a bit, I found that often the "Bow" geometry settings is the reason and so it was on my side ;-( I just had checked to reduce bow settings from 50 to 38 as 38 did not bring up the line in the middle.

So far so good.

@Curt: As my old, but very well modded Vertical board is out of order, do you know what kind of elements on this board mostly are "burned" by too much power (i think the 15V were much higher as my LVPS was also out of order a few days ago). I am thinking to renew some parts on this board also to learn more about how to solder properly Wink

)

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

do you have another clm to test? my clm doesn`t give me this weird problem.

i do not see this as a vertical board failure but i might be wrong

**Curt Palme** · Posted: Tue May 10, 2011 9:09 pm Post subject:

stefuel · Posted: Tue May 10, 2011 10:41 pm Post subject:

"You really should send the boards to a tech (me, for example ) or to someone in Europe that has had experience troubleshooting Marquee circuits."

Shameless plug, shameless.
There's a guy named Gary that........that.........Naaaaa, forget it Laughing

**Curt Palme** · Posted: Tue May 10, 2011 11:21 pm Post subject:

Hey, I have to! With the lack of donations from the zillions of ads that people are putting in the buy/sell section, I need to get more aggressive. Wink

Besides, Gary woujld somehow add an SDI output to that vertical board, and that's just not required.

Zolzar · Joined: 26 Jun 2009 Posts: 252

uh oh....so the SDI output I'm paying Gary to put on my Kodak Digital picture frame ........ doh....I'll stop there.

Lighter,
I have had the same issue. I've only really taken note to the line on bright scenes like a bright landscape shot of snow. Just letting you know your not the only one who has seen this problem.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Was the line Vertical or Horizontal?

Athanasios

lighter76 · Joined: 23 Aug 2009 Posts: 9 Location: Germany

The problematic line was horizontal and came just up when the Bow setting was above 38. So at standard 50 setting the line could be seen in bright pictures. Below 39 this line could not be seeen anymore.

@Curt: I know that you are right...normally I would send in my board. But in this case it is not only cheaper for me to try out the OPAMPS and other ICs to change, I like also the "fun" of soldering. I am not a complete newbie to this. I think the DIODES and Resistors, capacitors I just can check via a multimeter. Only the ICs etc. I can´t test ;-(

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

lighter76 · Joined: 23 Aug 2009 Posts: 9 Location: Germany

Ok, so I was speaking about "banding". Do you know what the mod of the CLM is to get rid ot his or is it better to live with this issue ?

By the way: I decided not to renew my vertical board ICs etc by myself...i think Curt is right that this is not a simple solder procedure and someone with higher skill level in soldering and testing components should do that Wink

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

https://www.curtpalme.com/forum_archived/viewtopic.php@t=21198.html

Gannon · Posted: Tue Jun 07, 2011 12:45 am Post subject:

Way to avoid excessive banding is to never use anything but the manual geometry and convergence...the interpolated/guided point choices cause the halfway and quarterway banding lines. Or at least the majority of 'em.

Cheers