CurtPalme.com Home Theater Forum

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

I have some issues that have crept in over the past couple months that i wouldnt mind correcting or at least knowing what is causing them.

On the green, I can focus the middle, top, bottom, and some areas of the sides, but adjusting the far sides causes the mid sides to adjust instead, and the outside edges are blury as f*** and cant be adjusted.

Blue and red seem fine though, but when i adjust the edges, i get flashing lines and quivering in the zones im adjusting, forcing me to run abit on the underside of sharp.

Another strange issue, when i defocus green with dot pattern its fine, but defocus with a full white screen and the middle of the green picture vanishes... Over focus doesnt cause the same issue.

Astig works perfectly on all three tubes.

**Curt Palme** · Posted: Tue Sep 16, 2014 12:23 am Post subject:

Also, check the 17 volt trimpot. I'll bet it's way off, causing the middle of the pix to die. That confused the HECK out of me the first time I saw it.. on an 808 I think.

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

Yeah i just did that recently, i lowered it from 18.86v to 17.3

I might take another meter home tonight and test it with that...

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

I had that same under focus issue making the middle black out with the 17,3 to low. Seems you are to low somehow. On the other hand I had it with dotpattern. Perhaps i have it with full white too. I'll check.

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

Maybe im not as low as you were, but yes, it seems strange.

I just got home and tested two meters, both read damn near the exact same, so i will open the machine up later on and wind it up abit higher.

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

Personally id expect 18.86v was abit high though...

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

Its not the voltage setting causing this, i tested it again with another two meters and all read within 0.05v, so i dont know, must be something after that pulling something down abit.

It was reading about 16.6v on 67.5kHz... What does yours read at that scanrate Tjeerd?

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

I'll check. But I watched a tv episode last night and that has been some time. Have been playing with Moome settings to many nights. I hate it when something is buggy and almost works. The Cine max just works or doesn't I like that much more Very Happy

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

Yeah I reckon my SMPS could do with a re-sleave like you did with yours. The image is very noisy in certain scenes and it follows the squealing.

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

I still think this focus issue on the edges is due to the stock timings, seems 1920x1080p at 60Hz is the only one to suffer, all others seem to focus ok, swapping the red and green focus coil cables didn't seem to have any affect, green was still sh*t house, and red was still fine.

Harder to pick than a broken nose really....

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

Might be that 300VM cap. If the esr gets to high it might be limited in current?

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

I might replace the lot in that same area soon i think.

Francisco · Joined: 05 Apr 2007 Posts: 305 Location: The Netherlands

Remember to adjust 17.3v on internal testpatern of 32khz

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

There is no 32kHz test pattern, there is 2 31.5kHz patterns, but no 32kHz pattern. I dont have a source that puts out 32kHz though either, all i have in that region are 31.5kHz.

It was originally 18.86v with the 31.5kHz pattern, lowering it to 17.3v was clearly too low, alot of issues were present after it was that low, and i couldnt get the colour balance right either. White and black crush, picture wasnt bright enough, you name it.

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

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

Yeah mate id have to go back and look at mine from ages ago, i had all sorts of strange issues when i dropped it to where it apparently belongs.

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

It is clear that the guys that have it way to high seldom complain here with problems Laughing

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

Jahoeeee!!! Seems the streaking issue is solved. Just played all my test material contrast till 80 nothing!

I am now at 18V in stead of 17,3.

**Curt Palme** · Posted: Wed Sep 17, 2014 8:58 pm Post subject:

That is very interesting! I will need to play with that once I have a 909 on the bench again..

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands