Cloud on rear projection TV screen
 

Hello folks- A customer complained about a "cloud" on his 52" RPTV. I
checked the TV and saw that he indeed has what looks like grey dirt,
which looks like a cloud. This dirt is visible only on bright scenes. I
cleaned the screen and the lenses (outside only) without success. Can
dirt inside one of the lenses cause this ? Or, is it possible dirt
somehow found its way inside between the fresnel and the outside screen
? Or maybe his cleaning habits did permanent damage to the lenticular
screen ? One thing is for su the "cloud" is there. I'm trying to
avoid any unnecessary disassembly. Thanks for your opinions.

moonlite

"moonlite" wrote in message
oups.com...
Hello folks- A customer complained about a "cloud" on his 52" RPTV. I
checked the TV and saw that he indeed has what looks like grey dirt,
which looks like a cloud. This dirt is visible only on bright scenes. I
cleaned the screen and the lenses (outside only) without success. Can
dirt inside one of the lenses cause this ? Or, is it possible dirt
somehow found its way inside between the fresnel and the outside screen
? Or maybe his cleaning habits did permanent damage to the lenticular
screen ? One thing is for su the "cloud" is there. I'm trying to
avoid any unnecessary disassembly. Thanks for your opinions.

moonlite


Dirt can get between the two screens or on the mirror, also bacterial growth
in the coolant is fairly common but when that happens it usually doesn't
affect all colors the same, generally green and blue get cloudy.

Seen results of customer induced damage due to smoking, use of candles, use
of fire place, dust and debris blown about by forced air heating/cooling,
dust from local construction, etc. Occasionally the material will get
between the fresnal, lenticular, and even protector screen. When it does
collect on the screens it may not necessarily be in any particular pattern,
however I've seen many where it tends to produce the "Cloud" or "Halo"
effect. Sometimes the material may be cleaned off with application of
appropriate cleaners and techniques, requiring removal and disassembly of
the screen assembly. This causes other problems because most customer
residences are not "Clean Room" specific. That is, by cleaning and
reassembling the screens in the average atmospheric conditions within a
normal home, dirt, dust, etc will end up between the screens, probably
producing another unwanted effect. Normally in these conditions we tall the
customer what the costs of a new screen assembly (All 3 items) will cost
them including labour. Never have seen this caused by the mirrors, yet, but
have seen fluid in SONY and PHILIPS branded products have bacterial growth.
"James Sweet" wrote in message
news:GN8pe.12356$_w.7117@trnddc01...

"moonlite" wrote in message
oups.com...
Hello folks- A customer complained about a "cloud" on his 52" RPTV. I
checked the TV and saw that he indeed has what looks like grey dirt,
which looks like a cloud. This dirt is visible only on bright scenes. I
cleaned the screen and the lenses (outside only) without success. Can
dirt inside one of the lenses cause this ? Or, is it possible dirt
somehow found its way inside between the fresnel and the outside screen
? Or maybe his cleaning habits did permanent damage to the lenticular
screen ? One thing is for su the "cloud" is there. I'm trying to
avoid any unnecessary disassembly. Thanks for your opinions.

moonlite


Dirt can get between the two screens or on the mirror, also bacterial
growth
in the coolant is fairly common but when that happens it usually doesn't
affect all colors the same, generally green and blue get cloudy.