Jay Walling
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 Posted:
Wed Feb 09, 2005 9:47 pm Post subject:
Inverter shutdown occurs on Dicon/Nextview 17" LCD monitor f |
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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 sheet 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*
Shielding, grounding etc. have so far proved fruitless.
If anyone has a schematic of the NV1740 or the Inverter inside (A Frontek
FIF1804), or even a datsheet/pinout for the oz960 inverter controller,
(hell, even a schematic of *any* inverter with this chip) I would be
extremely grateful.
Thank you.
[Remove MYBRAIN to reply by email]
Jay Walling
Diagnostic Engineer
jwalling@MYBRAINcomarkcorp.com
Comark Corporation
93 West St.
Medfield, MA 02052
http://www.comarkcorp.com
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