Attention Gregg

[Anonymous]

How are you Gregg?

Wow! I was checking out the Lion A/V site, and I want to learn how to service and calibrate a rear RPTV the way you can. My father in-law has a Sony LCD RPTV that just looks absolutely horrible. I haven’t touched it at all yet, but I was wondering if you might be able to explain to me how to do as you do. From your refferals it sounds like the end result is amazing and I would love to be able to give my clients, (and In-Laws), that sort of service. I am pretty sure that I will need a service manual even just for the grayscale on this set though. Any info you could give me would be fantastic, and greatly appreciated.

Thanks,

Corey Robb.

Topic

[Anonymous]

That LCD should be pretty straight forward like the plasma or LCD flat panels. The grayscale controls are in the SM … along with other goodies that reduce overscan and something that actually sharpens the image with added detail …

The AVS forum would have additional information in their archives.

regards

[Gregg Loewen]

also consider cleaning the light path and mirror on the RPTV units.

the RPTV crt stuff is an entirely different animal. electro static and mechanical focus, glare screen removal, convergence work, and then the grayscale work.

[Gregg Loewen]

As an example on RPTV Mits…dlp based…you would get huge improvement by cleaning the mirrors and lense and only a marginal improvement by doing the gray scale work only.

[Anonymous]

Speaking of RPTV, I juist had a request for a Hitachi 65swx20b. I am assuming the screen removal is straight forward, but I am curious about the rest of it. Can you provide a reference for cleaning the mirrors and lense? Thanks Gregg!

[Gregg Loewen]

actually the screen is quite hard on the Hits sets. It is a 3 layer stack….you have to cut the tape around the edges and then do a restack (moving the glare screen to the inner layer) so the same thickness will remain.

cleaning for the lenses and mirror….monster screen cleaner works well….you will have to do some buffing as not to streak.

the lenses should be removed so you can clean the concave glass under the surface (make sure you remove the correct screws or you will leak coolant all over the boards). This is what Mr Bob refers to as “deep optic cleaning”…which should be a standard part of any thorough crt job.

Gray scales are global…High is the base GS, then Med and Standards are offsets. I do 9300 for high, then 7500 for med, 6500 for std…i cant remember if this model has a BandW mode also.

this set will also be improved with color field uniformity by lense stripping.

Also do convergence….too much over scan reduction will cause the magic focus to fail.

this is actually a fairly hard set to do (right up there with the older Pioneer elites)…..perhaps not great for cutting your teeth on.

if you go to the hitachiservice.com site…you can register and download the service manual for free…..this will greatly assist with convergence work.

Good luck!!

Gregg

[Anonymous]

68 screws … and a heck of a time getting that screen frame off the cabinet.

any lint free camera lens cloth will do …

[Anonymous]

Sounds like a real joy! Hmmmmmmmmmm…I haven’t accepted the request…but I thought I might look into it. I appreciate all your help.

Thanks!

[Anonymous]

Hey Gregg,

I just tried to go to the hitachiservice.com site, and it looks like the domain is for sale…so they aren’t using it anymore. Any place else to obtain the service manual…other than paying for it? Thanks much!

[Gregg Loewen]

hitachiserviceusa.com ??

[Author]

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