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RE: (a bit OT) Video projectors
- To: ukha_d@xxxxxxx
- Subject: RE: (a bit OT) Video projectors
- From: "K. C. Li" <li@xxxxxxx>
- Date: Fri, 6 Jul 2001 10:59:23 +0100 (BST)
- Delivered-to: rich@xxxxxxx
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
> Given that there are some very good VP400QMs out there ... just make
sure
> that you get to see the hours counter on the bulb and check it out for
a
> green bias ... some of them had a strong green tinge. The advantage of
a
> second hand one is that you can check them out for dead / stuck pixels
an=
d
> they're unlikely to develop more.
Each pixel on the VP400QM is driven by two separate transistors. Should
one fail, the other can still maintain the pixel. With this
dual-transistor arrangement, the chance of developing dead pixels is
greatly minimised.
The green tinge that Phil mentioned is apparently caused by problems in
the LCD/optical arrangement and is very costly to rectify (=A31,000+). It
has been suggested that the problem with colour tinge is the result of
overheating. This is particularly relevant for people with "hush
boxes"
that are venting the heat generated by the main bulb incorrectly.
The fan on the projector also makes considerable noise (one of the major
complaints). As with all LCD projectors, the replacement cost of the main
bulb is high (about =A3400 for the 400QM with operational life of around
1,000 hours).
Regards,
Kwong Li
li@xxxxxxx
Laser Business Systems Ltd.
http://www.laser.com
____________________________________
Automated Home UK
http://www.automatedhome.co.uk
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