CurtPalme.com Home Theater Forum

[1031]

Here is little list of lvps parts..Those ordernumbers are to Farnell(sorry no digikey here in Finland)
I did full recap on my 7500(8110) and it seems to work ok with those panasonic caps.

[CZ Eddie]

I couldn't find those LVPS caps anywhere so I wound up buying them from www.parts4pinballs.com in Sweden (?).

This is what I ordered:

[CZ Eddie]

Okay, I got all my parts in on Thursday. So far I've put the following onto my HVPS:

[garyfritz]

This is great, Eddie! Mike made tons of great suggestions in that original thread but I never had a clear idea for what mods would help what. Your subjective "user level" report of what affect they're having is very useful. Keep those comments coming!

[CZ Eddie]

Hey Gary, something that might interest you is that this did not fix, but did subjectively diminish... is the 1/3 of the picture where it's lighter than the rest. This is according to your recent thread.
The issue is still there, but no where near as noticeable as before.

I'm hesitant to say it's a night and day difference as far as overall picture quality goes with the very few mods I've made so far. But I have to admit that it is a noticeable visual improvement so far!

"Maintenence" my ass... this was darn near a "mod"! I can't wait to try the rest of what Mike Parker has suggested. And also BillBlue and Sly and all the others who helped out on Mike Parkers thread.

I'll start individual threads for each component, as I go through them. It'll take time to upload pics and write stuff up though.


I did burn myself with the soldering iron though.


And I taught myself how to use the soldering wick that my Dad left me about ten years ago!!

[garyfritz]

Interesting! My "rectangle of video noise" is no longer a concern since I re-jiggered everything and now I run with the brightness VERY low. But that's good to know.

Please don't do a separate thread for each component! One thread for "CZE's results from Marquee Maint" would make it a lot easier to find things.

Solder wick, ick, I hate desoldering. That's the biggest thing that's kept me from doing these fixes. Had a helluva time just pulling the 3 resistors to do the squeeze mod. I keep thinking a solder-sucker MUST work better. I should practice on some old junk boards until I figure out the process better.

But it sounds like I should order some parts!

[JustGreg]

Yeah Sly used parts that weren't an exact physical fit for the originals. Although the process seems benign enough, scratching the coating to reveal the trace gives me the willies.

Now that this subject is alive again and there are parts being listed and some novice results (no offense meant Eddie) coming in, I guess I should get busy ordering parts n' pieces.
Getting rid of the noise on the tube faces is my biggest want right now. (That and getting my hands on an O scope and learning to use it)

Sounds great Eddie!

Greg

[JJSuperfly]

I be wanting several of the mods and am wondering who north of the 49th (but not Alaska) is willing and experienced in doing these board mods? (I'm not anti Yank, just not wanting the hassle and cost of transborder shipping X2).
/JJ

[PaulB]

[1031]

Hello. That resistor is same value (475 ohm) that was "original" part. It is just normal trough hole component not smd. So you can use it. That trim.pot is similar to one that was used on "maintenance tread"
I have done about 5-8 lvps "heater fix mods" with those components without any problems.
On few cases voltage adjust range was little "on the edge" 20ohm trimmer was fully turned to max to get 6.35v. At some cases (when adjust range was not enought) i used one 10 ohm resistor series with that 475ohm resistor to get proper voltage to filaments.

[PaulB]

I see, thanks for putting me straight on that, I've not seen this version of the fix before.

So where does the through hole-resistor go?

{message edited and image deleted to avoid confusing myself and others]
Many thanks,
Paul

[1031]

You can put that "normal" 475ohm resistor underside of pcb, just cut that trace as it was shown on maintenance thread and found proper contacts for that resistor

http://www.dvdplaza.fi/forums/showpost.php?p=888641&postcount=2
Those picts might help you
And remember to measure(adjust also) voltage before you put that p14 connector back in place.

-Jarmo

Edit: i foundet one picture (out of focus..) that shows points where to put that resistor.

[PaulB]

Many, many thanks Jarmo! That explains everything, excellent

I really appreciate you taking the time to explain this to me,
Paul

[1031]

Glad to hear that my "helps" with my bad english helped you

[garyfritz]

Just to be sure you understand, Paul -- you don't replace ANY of those resistors you marked. The resistor on the underside of the board goes in series with the new trimpot. The idea is to replace the 0-500 (or whatever it is) trimpot with 475ohm fixed + 0-20ohm trimpot. That way the adjustment range only goes from 475 to 495, instead of 0 to 500, so even if the trimpot goes bad the total resistance will stay in an appropriate range.

[PaulB]

Understood Gary and many thanks for the clarification. I'd (eventually!) figured that out from Jarmo's links but your comments made me think it best to edit my message so as not to confuse myself or others with misleading content.

Again, thanks for the input guys. I know this is old hat to many around here who must be fed up going over the same ground time and time again but your help is very much appreciated by us noobs.
Paul

[Nashou66]

Guys i just ordered a bunch of parts for some of the maintanence stuff and a few for slight performance mods ffrom some older AVS threads in the archives , I'll post the links here ;

This thread has alot of great theory stuff and links to other marquee and generalo related elecronic discussions, lots to absorb, i keep re-reading and discover new things.
http://archive.avsforum.com/avs-vb/showthread.php?s=d2cb8c5c67e54f5807fd1eea2889b760&threadid=416624&highlight=Jaehong+Lee

This one list some of the resistor changes from the maintenece thread and a few others i think.
http://archive.avsforum.com/avs-vb/showthread.php?s=&threadid=401345

Focus board mod.
http://avs.hardware-chat.com/CRT_Projectors/1766-My-adventures-in-further-Marquee-mods--chapter-1-

Have fun on your reasearch.

Athanasios

edit:

PS: I might have a lead on some CLC449's i think if i get 50 or more i'll have a better price. maybe $8 each .

[PaulB]

Just to let everyone know, I've had the LVPS, HVPS, the 16:9 fix and the C50 cap fix on the HDM all completed!

You know, it sounds daft but I'm actually quite relieved that I've had these maintanence mods carried out. I was concerned at the filament issue but the others worried me a bit as well. I think preventive maintanence is really necessary and well worth the minimal expense and effort for that 'just in case' situation.
As I've not actually set the 9500LC up yet, I can't tell if any of the maintenance has improved the pq or anything, the pj has been dis-assembled for maintenance and is only now been put back together for testing the LVPS etc.

I'll look to get the resistors changed on the vertical and converence boards as soon as I get the parts from Digi-Key (convergence drift has always been a bug-bear of mine ) and will get the VIM board modded at some point.

My thanks to Mike Parker for the original master-class maintenance thread and to all others who contributed to that and many other threads on the subject. Of course, my thanks to all you guys here who tirelessly give advice and help to those of us in need !
Paul

[PaulB]

I'm maybe being silly again, but.....!

Has anyone done the Convergence and vertical boards using the parts identified by CZEddie? I'm just checking that these are the right parts to use before getting the mod done.

[Nashou66]

I think mikes original Words were a typo:
"There are also 48 1.2 ohm (same mickey-mouse resistors) right near the power transistors."

The 1.2 was suppose to be a 1/2 ,the back slash key is right next to the period key.

So for those who got 1.2 ohm resistors have it wrong. look at the value on the board and i'm pretty sure there 1 ohm so he would have doubled up or replaced with 1/2 ohm 1/4 watt. But on the wattage he say earlier to use 1/2 watt not 1/4 watt and i dont thing going up to 1/2 watt will hurt any.

Some one else chime in if i am wrong.

EDIT: they supposedly are 1.2 ohm after going back to original thread on AVS and reading a crap load of posts.

Athanasios