CurtPalme.com Home Theater Forum

[Heywood Jablome]

Well, damn little green.

Prior to doing the full reinit the white balance was quite good... did a reinit (without checking drive and G2 of course, and without using the Librarian to store the settings) and now green is VERY dim, while red and blue are fine.
This is true with all three WB settings, and trying to pull green back up with drive and G2 fails:
Drive does not provide enough boost even at 100 to get the green even half way back, and the raster glow of G2 becomes too much at 80 or so.

[Heywood Jablome]

Pulled the Moome HD-VIM 1.2 hdmi RGB2 card, no effect...
Pulled the CM and ACON boards, no effect...
Pulled and re-seated FDM and HDM several times, same-same.

Flipped the mini-RCAs on the VIM between green and red, no effect (besides moving the menus to red!)

I even entered a custom white balance with blue and red WAY down and green up... very little effect.

Either I'm missing something basic or there was a coincidental failure. I'm leaning toward the former!

[Heywood Jablome]

Before I forget... the LVPS is an "Issue 3" (rev 03) which includes the factory P14 fix. Tested last weekend to be 6.34VDC.

Next step: Repeatedly re-seat CLM and Deflection Board and measured lith battery (3.02VDC.) (I googled up something about dim tubes and def board.) No love, still got the dim green.

[Heywood Jablome]

Problem persists from 480i (composite and moome HDMI) thru 1080i and 1080p (RGB and HDMI) so the issue effects pretty much all inputs.

[Tim in Phoenix]

Hello

Troubleshooting Marquee Video Problems Without A Scope

One does not always have the luxury of a dual trace scope on the road,
here are a few norms to test for if your Marquee has high voltage and
picture problems, like flashing, or no pix at all, or one color is weak:

Vim Mini Coax Levels, Unplugged From VNB:

With CONT of 40 and BRITE of 40, the tip of the mini coax feed
gives 110mv with internal stairstep, 255mv on white field.

Internal Pattern Sequence is 1) Hatch plus Dots,
2) Dots Only, 3) Stairstep, 4) Full White, 5) Source

G2 Values and Voltage, measured at tip of VNB R76:

G2 of 40 gives +375vdc
45 +415vdc
50 +462vdc
55 +510vdc
60 +555vdc
65 +600vdc
70 +646vdc

Fluke DVM dc limit is 655vdc and goes into alarm mode.

Brightness Control Line to VNBs, P13 Pin 8:

BRITE of 0 gives +2.02vdc
10 +1.59vdc
20 +1.19vdc
30 +0.81vdc
40 +0.37vdc
50 - 0.02vdc
60 -0.44vdc

We have observed Marquees with leaking glycol where this control
voltage was shorted to +5v on the MB and as a result the tubes shut
down for no apparent reason; you would think you had a bad VIM
or neckboard but it was not so.

Tim at E-Tech Systems 480 368 7434 http://www.etechvideo.com/

[Heywood Jablome]

Thanks Tim! I'll check out those values and be back this evening.
Any more likely than the others?

[Tim in Phoenix]

Hello

Your problem is unusual, so check everything.


.

[Nashou66]

Heywood, i had a simmilar problem with a red tube. One of the resitors for the neck board mod lost its solder joint contact it was just in the through hole and not soldered in(cracked solder) reflowed the solder and G2 levels went back to normal, so swap VNB first to make sure it is a vnb problem. It was the resitor that stands up on end all alone, but it could be any of the G2 resitors.

Athanasios

[Tim in Phoenix]

Hello

Check the filament voltage while you are in there, motherboard connector P14 near the back of the blue tube, over 6.50 vdc is trouble waiting.


.

[Heywood Jablome]

Filiment was good last time I had the heatsink down, will re-check when I'm in the neighborhood.

I've got a cheapie rat-shack VOM (damn the bastard that stole BOTH of my Fluke 82s...) with a DC range of 1000V and an AC range of 750. I've also got access to VERY good oscilloscopes... some so good I can't figure them out! The Tek 2050 portable should suffice for anything I need to do, and that one I CAN figure out

I'll probably try flipping VNBs as a simple test since I've got to expose that end of the tubes anyway. If the problem follows then the timing will be the biggest coincidence I've ever suffered in CRTs...

[9kids]

I can't think of anything that a reinit could have done, so it's probable just a coincidence. But just incase something got really wacked out during the reinit, you might want to just try another reinit. You probable tried that but just in case you didn't it couldn't hurt.

[Heywood Jablome]

[Heywood Jablome]

Problem DID NOT follow the VNB. Checking Tims' list now.

[Nashou66]

[Heywood Jablome]

I ran some of Tims' voltages. The mini-coax millivolts is interesting, as is (potentially) Pin 8 BRITE on P11 and P12 (I skipped P13 Blue)




Vim Mini Coax Levels, Unplugged From VNB:
With CONT of 40 and BRITE of 40, the tip of the mini coax feed
gives 110mv with internal stairstep, 255mv on white field.

Internal Stairstep: Red:105 Green:140.6
White Field: Red:213.9 Green:284.9


G2 Values and Voltage, measured at tip of VNB R76:
G2: 40 (+375vdc) Red: 368 Green: 371
G2: 45 (+415vdc) Red: 408 Green: 417
G2: 50 (+462vdc)
G2: 55 (+510vdc)
G2: 60 (+555vdc)
G2: 65 (+600vdc)
G2: 70 (+646vdc) Red: 642 Green: 644


Brightness Control Line to VNBs, P13 Pin
BRITE 0 (+2.02vdc) Red: 2.20 Green: 2.30
BRITE 10 (+1.59vdc)
BRITE 20 (+1.19vdc)
BRITE 30 (+0.81vdc) Red: 1.07 Green: 1.15
BRITE 40 (+0.37vdc)
BRITE 50 (-0.02vdc)
BRITE 60 (-0.44vdc) Red: -0.55 Green:-0.61


I'm also going to flip the mini RCAs again... I want to get a feel for whether that alone is the biggie or if I'm seeing multiple issues.

[tse]

One thing to think about. The green drive control is restrained in the firmware to have a very small range. 0 green drive is like red and blue drive when at 90%. 100% green drive is like red and blue drive when at 95%. Green drive is used as a reference and should be set at 90% and left there. So if red drive is set at a low value (normal for white balance is 20 to 40%) that might explain the lower reading. To compare the different colors the drive and G-2 settings should be the same. So green drive at 90% and red drive at 92% should give readings that are close to the same.

Scott

[stefuel]

Would it be of any help to find another forum members Marquee in the same condition and re-load it with their Librarian settings?

[Heywood Jablome]

[Curt Palme]

Just swap over the wiring that goes to the VNBs.

Swap the G2 lead between the boards, the RCA connectors (at the neck board, not at the VIM).

Unless it's the tube, SOME drive signal from the chassis is not driving the green tube properly. Find out which one it is and you'll narrow it down.

[Curt Palme]

Just swap over the wiring that goes to the VNBs.

Swap the G2 lead between the boards, the RCA connectors (at the neck board, not at the VIM).

Unless it's the tube, SOME drive signal from the chassis is not driving the green tube properly. Find out which one it is and you'll narrow it down.

[Heywood Jablome]

Did the RCA swap last night... no effect. Do the other drive lines have the reach?