Re: Sun Monitor Tuneup - how?

From: Ed Hall (ehall_at_ultraspec.com)
Date: 01/07/05 

Date: Fri, 7 Jan 2005 12:12:09 -0700

Hi,
I think you can find schematics for the N1 which is the next model after the
20D10 and VERY similar.
http://fileshare.eshop.bg/index.php?pagetogo=2&what=search2
the files (3) are SONY-A1.part1.rar and part2, part3 etc. You might find the
20D10 under a similar Sony model number though, the 20SE1T may be the right
one, I think they were the French models...
May help some anyway. Didn't find the 20D10 exactly but the N1 is the 20D20.
Main difference was that the D10 only worked with composite sync and had a
limited scan range (generally didn't go below 1024 x 768) where the 20D20
accepted composite, separate and probably sync on green too. And it would
sync at the lower resolutions 640 x 480 etc. too.
Hope this helps,
Ed Hall

"Sunny" <sunny@nospam.net> wrote in message
news:cG3Dd.42563$P%3.1772793@news20.bellglobal.com...
>I recently acquired (from the dumpster) several Sun Microsystems 20"
>monitors, model GDM - 20D10, which appear to be Sony Trinitrons on the
>inside. They are really nice when working properly, but were manufactured
>in 1994 so probably aren't worth sinking $ into.
>
> I'd like to get two of them running to upgrade the 17" pair I'm currently
> using.
>
> One worked reasonably well as-is, but was unusable due to severe CRT
> burn-in. The others had symptoms ranging from collapsed display to failure
> to power on at all.
>
> I made inquiries about professional repair, but nobody was willing to
> provide even a diagnostic estimate - they said the chassis is unreasonably
> difficult to work on.
>
> I decided to have a go myself, and experienced the difficulties first
> hand - the internals are completely surrounded by multiple layers of metal
> shielding, with circuit boards mounted to the inside of the shields all
> over the place. It takes almost an hour of disassembly just to check the
> power supply fuse, and close to another hour to dismount boards and
> arrange them such that one can apply power and take measurements with any
> degree of safety.
>
> Without going into tedious detail, I've swapped parts around and now have
> two working monitors with good CRTs. One is almost perfect, except for a
> slight "shimmer" (not sure how else to describe it), while the other is
> sharp but exhibits faint retrace lines and has the display offset to the
> left about 1/2" further than can be corrected with the remote control.
>
> It seems to me the remaining problems are minor and could probably be
> corrected via internal adjustments, but there are a *lot*, mostly
> unlabeled, and I'm well aware that fiddling with them to see what effect
> they have is not the recommended approach. Looks like these monitors now
> just need a good "tuneup".
>
> Any suggestions on next steps? - given that obtaining a service manual is
> highly unlikely, the professionals aren't interested, and my electronics
> knowledge doesn't extend much past digital logic circuits?
>
> TIA
>
> Sunny
>

Relevant Pages

  • Re: Sun Monitor Tuneup - how?
    ... separate and probably sync on green too. ... > to power on at all. ... > shielding, with circuit boards mounted to the inside of the shields all ... > two working monitors with good CRTs. ...
    (comp.sys.sun.hardware)
  • Re: Sun Monitor Tuneup - how?
    ... Ed Hall wrote: ... >>to power on at all. ... >>shielding, with circuit boards mounted to the inside of the shields all ... >>two working monitors with good CRTs. ...
    (sci.electronics.repair)
  • Re: Sun Monitor Tuneup - how?
    ... Ed Hall wrote: ... >>to power on at all. ... >>shielding, with circuit boards mounted to the inside of the shields all ... >>two working monitors with good CRTs. ...
    (comp.sys.sun.hardware)
  • Re: Async Processors
    ... Coal-Fired Power Plant ... "With the Forecast Icing Potential tool, ... design has significant advantages over standard sync clocked logic ... using sync designs if your goal is to reduce power consumption. ...
    (comp.arch.fpga)
  • Re: Looking for HDTV Display That Autosyncs to Different Resolutions
    ... see the sync problem I am referring to. ... has booted and then power off and on. ... The second unit is on a stereo receiver, with DirecTV at 1080i feeding one ... and a DVD player feeding the other channel. ...
    (alt.tv.tech.hdtv)
Loading