Recovering from Hitting Reset Button
In Service Menu
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Tip from Mr Bob: A Mitsu 65903 owner, Doug McCoy,
was tweaking his set when he did the "unthinkable": hit the reset button while
in the service menu. As a consequence, everything was "screwed up" as he
described it. The geometry, convergence, and colors were off."
Video specialist Mr Bob to the rescue. =)
"Well, it is done! It ALL looks spectacular now, just like a 65905 should. Just
wish I could take all the credit ... Doug took what I had told y'all from the Mit tech,
and went back exploring, but this time with a new respect for writing things down. He very
carefully researched what would happen in each of the 2357 menus, and guess what? Several
of them needed attention, and they ALL do something, it seems, despite only one or two
being mentioned in the manual.
The first thing he remedied was the horrendous YC delay in the NTSC picture, and the
skitterishness of the color, being scene-dependent as to whether it would appear or not.
What he found was that in the 3DYC menu, there was an entry called RDL, number 30, that
had been set to 0. This was why it was so skitterish. When he played with it and reset it
up a few numbers, it cooperated with restoring the color stability. I found that 6 gave me
the best matchup in YC delay, using first the AVIA YC delay pattern, and then for more
exacting results, the orange highlighted selections in the AVIA title menus themselves.
When it's just right, the outlining disappears on whatever side -- right or left -- it was
appearing on, and the orange is perfectly centered in the middle of the letter itself. You
can tell this is a good YC delay phenom rather than a convergence phenom because the other
selections, in white, remain perfectly converged while the orange highlighted headings go
back and forth horizontally in response to the tweaking of the numbers in those YC
Of course, Paul is the one who clued me in on where in general to do the fine-tune YC
delay trimming, but the choices given us by Paul in the chroma section -- or was it the
defl. jung. sec? -- are little steps compared to the massive steps available in the RDL
The next thing he tackled was the lowering and misshapening of the image in the 4:3
graybarred NTSC section, where VPOS in the defl. jung. does nothing to help. Does nothing,
period. The Mit tech told me he expected that, but did not tell me where to go to find a
location that worked.
Doug found 2 locations that made a difference.
What he found was that in the PTC Logic section -- where the Mit tech had told us to
look -- there is a location, number 25, titled Mode. It had been set to 3. Playing around
with that one turned up 0 to be the correct setting. It recentered the image in the middle
of the screen, up to down, and reshaped the picture quite nicely.
He also found that there are both VPOS and HPOS in this sector, both of which work! We
had to go back and forth between VPOS and the modes before we got it totally straightened
out -- actually all 3 had to be played with, ultimately -- but the end result was truly HD
There you have it, folks. You now know more than the Mit tech does.
What's important to be aware of is that even though only one or two 2357 menus are
mentioned in the Service Manual -- defl. jung. and chroma are the only ones, I believe --
all the menus there probably have massive effects on the picture. We found the ones that
were critical to this particular op, but if Doug had screwed around even more than he did
do, we'd probably have had even more work to do.
Which is a dangerous land mine on the one hand, and was our salvation on the other.
ALWAYS WRITE EVERYTHING DOWN BEFORE CHANGING ANYTHING! We can't
stress this enough.
And if your remocon is trigger-happy, like one Sony I used earlier today, expect that
every once in awhile you'll skip 2 registers while you were looking away, and thought you
had skipped only one. If you are trying to play with this stuff by just remembering it,
you may have just wound up altering some figure you never saw in the first place.
Or the Volume controls, which work the value numbers, are above or below the channel up
and downs, which scroll the registers. You think you're de-escalating a value when you're
really advancing a register because you were talking to the customer and/or answering a
question, and suddenly you've gotten up and down mixed up just once. I've done it myself
It takes a lot of concentration to do this job without writing things down, which you
can do with certain registers -- grayscale NOT being one of them -- after you have become
experienced; but due to land mines like trigger-happy remocons, even experienced
calibrators have to be VERY careful, and concentrate to the max whenever working on a set
like this. The amateur do-it-yourselfer working on his own unit who isn't concentrating
very much in the first place, and is not writing down anything either, has a fool for a
calibrator and an idiot for a client.
And from Doug's reaction when I quizzed him initially about having written things down
like we've been saying here on these forums for years -- he looked like Trekkie Jon Lovitz
when William Shatner asks him if he has been kissed yet, on that classic skit from
Saturday Night Live where Shatner, speaking a Star Trek convention, tells them all to get
a life, then has to backpedal really fast and figure out how to take it all back -- I
think even Doug would agree with that appraisal of the situation now.
Of course for him that's now in the past -- his respect for how easily these sets can
get screwed up from indiscriminate service menu surfing is now cast in stone...
More from Mr Bob
"The 805s and 905s have looked identical to me, so far, in their service menus.
That would be consistent with Mits philosophy of having one type of chassis be universal
until or unless they make some major changes. The V6 chassis, the V10 chassis, VZ6, etc.
The exception here is that I'm sure that Doug's is a 903, because the 903 uses the menu
2357 and 9 to get into the service menu, whereas the 905 uses the new menu 1257 and 9
And no, I WISH I had the power to make a 903 into a 905 with a simple series of remote