CurtPalme.com Home Theater Forum

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Shoot Curt an email and he can help you out.

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

im working on setting up my g70 on the ceiling. i didnt notice when i had it mocked up on the table but the blue is baddly out of focus on the corners, is this a flapping problem?

AFryia · Posted: Mon Mar 28, 2011 10:45 pm Post subject:

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

phosphor gain technique? is there a thread on that?

mc86 · Posted: Tue Mar 29, 2011 5:06 am Post subject:

I think the phosphor technique referred to is holy focus thread that seems to have gained quite the reputation. It is on my to-do list this summer. It is a few clicks through here:
http://www.curtpalme.com/Focus_and_Mechanical_Aim1.shtm

bests,
Matt

PS - Good gravy, why am I reading the G70 threads at 1AM -- this CRT sickness is dreadful.

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

thx, ill read into it. looks like the blue edge focus problem is more on the entire right side as apposed to all corners. we watched a movie last night on it and on bright scenes i now notice a yellowish vertical "stripe" just to the left of center screen. its very distracting now that i noticed it. maybe more tube wear on the green?

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

ok, i dabbled with the em focus, turns out the blue is out of whack. the flapping didnt do much of anything, though it may be off now! things improved greatly when i started adjusting the em focus. the yellow band is gone and i see how i can actually cause yellow dull spots with these adjustments. i just went by the owners manual to get my feet wet for now. i need to make sure my flapping is correct first now that i fiddled with it. any tips? it doesnt seem to make a bid difference other than shifting the image, not much focus variance....

AFryia · Posted: Wed Mar 30, 2011 11:58 pm Post subject:

REGNAD · Joined: 15 Oct 2006 Posts: 173 Location: RICHMOND VA

yeah i got it printed and plan to go through hopefully tomorrow and set it all up. im sure that i couldnt see much edge focus variance because it was sooo out of focus.

Diopter_Doctor · Joined: 24 Sep 2019 Posts: 36

Anybody here want to get rid of some tubes or boards from their G70?
My convergence board is bad and my tubes are over 7k hrs.

_in_peace_ · Joined: 21 Jul 2009 Posts: 152 Location: Sweden

Some greetings from G70 with vr lenses

Source: PC, MPC, MadVR DXVA --> Sharpness Complex 2 + Nvidea Sharpness 49% --> RGB 16-235 ---> Moome 1.3

ElTopo · Joined: 07 Nov 2006 Posts: 1640

WOW that looks like a perfect black level Thumbs Up

HaydnG90 · Joined: 22 May 2006 Posts: 1356

How big is the screen? Looks great.

_in_peace_ · Joined: 21 Jul 2009 Posts: 152 Location: Sweden

Thanks Topo.

Its a little to wide, 2m ca.
Better in roof over head i think, than just behind coach.

Diopter_Doctor · Joined: 24 Sep 2019 Posts: 36

OK, G70 community. I have a puzzle to figure out.

Most of my convergence controls do not work. As I change the value on the screen, the physical picture does not change.
For each tube, its the "Sub DY" and "MG Focus" on the tube neck.

I have narrowed it down to only a few possibilities of what is wrong.

So far, I have replaced the D board (Focus), replaced the 2 large convergence chips on the DC board, and have resoldered all connecting pins on both boards.

Possibility #1: Either the connector between the D and DM board or the connector between the DM and MF board is messed up.
Possibility #2: My DC board and EB boards both have total failure of their control functions and is just two separate problems.

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Anyone have any experience with this issue?

Purple: everything works except H. Lin
Green & Orange: none of these controls work

gjaky · Joined: 05 Jun 2010 Posts: 2802 Location: Budapest, Hungary

Diopter_Doctor · Joined: 24 Sep 2019 Posts: 36

gjaky · Joined: 05 Jun 2010 Posts: 2802 Location: Budapest, Hungary

The idea would be to follow the generated convergence signals by the oscilloscope. Usualy each correction signal is generated separately around the CPU board, then they are summed together. These summed signals are sent to the convergence power amplifier board. An oscilloscope would be helpful in tracking down these signals.

Diopter_Doctor · Joined: 24 Sep 2019 Posts: 36

Thanks for your help.

On the service manual it shows a few waveforms to check for but there are many more Test Points that I don't see what value they should be when checked.

I'm looking at the Yb board which contains the CPU chips. I don't see any controls labeled for convergence on the board although it connects to the D board (focus) (those points ARE working) and to the DC board (convergence) (those controls AREN'T working.)

gjaky · Joined: 05 Jun 2010 Posts: 2802 Location: Budapest, Hungary

The STK392-220 chips are traditionally running re hot, hence they often fail. Isn't a blown fuse or power resistor there on the DC board?