[sdiy] LEDs dying in LCD alphanumeric display

[Harry Bissell]

I was able to re-use the substrate...

H^) harry

----- Original Message -----
From: Matthew Smith <matt at smiffytech.com>
To: Synth DIY <synth-diy at dropmix.xs4all.nl>
Sent: Mon, 07 Nov 2011 15:45:51 -0500 (EST)
Subject: Re: [sdiy] LEDs dying in LCD alphanumeric display

Quoth Harry Bissell at 08/11/11 00:23...
> I had a similar failure in an Alesis D4 drum machine. The LCD was backlit by 24 parallel
> connected LED chips bonded to a copper (PCB) substrate. Once one chip fails, the others get
> progressively higher current and fail more rapidly.

If replacing, why not make a new PCB with series connected LEDs, with an 
appropriate driver chip?

-- 
Matthew Smith

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-- 
Harry Bissell & Nora Abdullah 4eva