Re: Inverter shutdown occurs on Dicon/Nextview 17" LCD monitor from 455MHz rf signal. Design flaw?

From: legg (legg_at_nospam.magma.ca)
Date: 02/09/05 

Date: Wed, 09 Feb 2005 17:35:01 GMT

On Wed, 09 Feb 2005 10:47:59 -0500, Jay Walling <see@sig.nul> wrote:

>We seem to have run into a serious design flaw with the NV1740 LCD
>monitor. One of our customers has noticed (and we have re-produced the
>problem in our factory) that a 455MHz RF transmission from a Motorola
>CP200 handheld radio http://www.commusa.com/catalog.aspx/Motorola_CP200 is
>knocking out the backlight on this monitor. The monitor must be power
>cycled before the inverter starts up again. I have poked around with an
>'scope on the inverter, and know that the problem is localized to the
>inverter itself - the TFT controller does *not* drop the enable signal to
>the backlight. I suspect that the O2 micro OZ960 chip on the inverter is
>sensing an over-current situation on it's outputs and shutting down. I
>looked for a data *** for the chip on O2 micro's website in the hope
>that I could adjust the over current sense circuit, but they do not offer
>them without an NDA. *sigh*
>
So sign the NDA and fix the problem with the frs assistance.

Signing an NDA is not the problem.

RL

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