[sdiy] Boss DR110 weak display

[Gil W.]

Thanks all ! seems to be a contact issue... I dismantle the LCD and rubber connectors, cleaned and put it all back and now it is fine !

It works ok except of that I can't hear any change of accent, when rotating the Accent knob :/




--- On Mon, 7/25/11, Harry Bissell <harrybissell at wowway.com> wrote:

> From: Harry Bissell <harrybissell at wowway.com>
> Subject: Re: [sdiy] Boss DR110 weak display
> To: "mike schmidt" <itsfatmike at gmail.com>
> Cc: synth-diy at dropmix.xs4all.nl, "Gil W." <gil_we at yahoo.com>
> Date: Monday, July 25, 2011, 5:19 PM
> Q17 is the bias circuit for the LCD,
> it should be 1/3 the supply voltage. I checked the online
> docs and it seems that the hitachi processor chip is
> responsible for setting the LCD column pins
> to 25% duty cycle, 1/3 Vcc or something like that..
> 
> H^) harry 
> 
> 
> ----- Original Message -----
> From: mike schmidt <itsfatmike at gmail.com>
> To: Harry Bissell <harrybissell at wowway.com>
> Cc: synth-diy at dropmix.xs4all.nl,
> Gil W. <gil_we at yahoo.com>
> Sent: Mon, 25 Jul 2011 10:11:55 -0400 (EDT)
> Subject: Re: [sdiy] Boss DR110 weak display
> 
> Harry, that was my first thought, but in my glance at the
> service manual I
> didn't see a bias supply circuit.
> 
> On Jul 25, 2011 10:07 AM, "Harry Bissell" <harrybissell at wowway.com>
> wrote:
> > "I'm not a doctor, although I play one on TV..."
> >
> > Is it possible that the LCD bias supply was damaged as
> part of the battery
> leak, and the display is actually OK but the
> > setting of the viewing angle is totally wrong (perhaps
> 'off-screen' so to
> speak) ?
> >
> > H^) harry
> >
> >
> > ----- Original Message -----
> > From: Gil W. <gil_we at yahoo.com>
> > To: synth-diy at dropmix.xs4all.nl
> > Sent: Sun, 24 Jul 2011 03:15:48 -0400 (EDT)
> > Subject: [sdiy] Boss DR110 weak display
> >
> > Hi all.
> >
> > I've been fixing a DR110 which had battery leakage.
> Some acid drops here
> and there, basically I think it is fixed now as it powers
> up and all buttons
> responds and it sounds and functions as it should with no
> seen issues.
> >
> > The only problem is that I can barely see anything on
> the display. I first
> thought that there was nothing displayed at all, but then I
> noticed that it
> does show faint marks, which are seen better as I enlarge
> the viewing
> angle... it looks like it does show the correct data, once
> viewable.
> >
> > The power adapter I'm using is 9v/880ma so I see no
> problem with that... I
> also tried batteries - 4 x 1.5v and a 9v. With the 9v
> battery the display
> marks are better seen, but still not fully, and the
> strength of display
> changes with the preset... Inside, the operating voltage as
> it should - 5.4v
> >
> > Are the LCD displays (such as in the DR220/TR707 etc)
> known as tending to
> get weak over the years and need replacement ? any idea
> what could cause
> that and what should else be checked ?
> >
> > Thank you very much for your help!
> > _______________________________________________
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> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> > --
> > Harry Bissell & Nora Abdullah 4eva
> > _______________________________________________
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> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> -- 
> Harry Bissell & Nora Abdullah 4eva
>