I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which obscures
the =/- signs. The black area is always visible, even with the instrument
switched of. Is there any way to correct this problem? The cost of
replacing the display would be prohibitive, even if I could source one and I
could probably buy another Fluke from eBay quite cheaply.

Terry D.

In article , Terry D
scribeth thus
I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which obscures
the =/- signs. The black area is always visible, even with the instrument
switched of. Is there any way to correct this problem? The cost of
replacing the display would be prohibitive, even if I could source one and I
could probably buy another Fluke from eBay quite cheaply.

Terry D.



Got a couple of 8050 A's one of which has this problem now somewhere on
the net is an article on how to make them replacement LED and it wasn't
at all difficult..

Dammed if I can remember where I put the URL now!..

a goggle search might show it up..
--
Tony Sayer

Terry D wrote:

I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which obscures
the =/- signs. The black area is always visible, even with the instrument
switched of. Is there any way to correct this problem? The cost of
replacing the display would be prohibitive, even if I could source one and I
could probably buy another Fluke from eBay quite cheaply.

Terry D.


It is not possible to correct a display that has failed in this way. We
used to sawp them out at work for new ones but our stocks are long gone
as this was a regular fault. Getting a spare from a otherwise faulty one
on ebay would be a good way to go. You might find it worth while to find
the partnumber of your display and see if it is used in other flukes of
a similar vintage to give you a wider range to target on ebay.
I have an 8020 which I'm pretty certain has the same display. A brief
search has not turned up my manual so I can't give you the part number
to compare.

Good Luck

Bob

Bob Minchin wrote:

Terry D wrote:

I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which
obscures the =/- signs. The black area is always visible, even with
the instrument switched of. Is there any way to correct this
problem? The cost of replacing the display would be prohibitive, even
if I could source one and I could probably buy another Fluke from eBay
quite cheaply.

Terry D.

It is not possible to correct a display that has failed in this way. We
used to sawp them out at work for new ones but our stocks are long gone
as this was a regular fault. Getting a spare from a otherwise faulty one
on ebay would be a good way to go. You might find it worth while to find
the partnumber of your display and see if it is used in other flukes of
a similar vintage to give you a wider range to target on ebay.
I have an 8020 which I'm pretty certain has the same display. A brief
search has not turned up my manual so I can't give you the part number
to compare.

Good Luck

Bob

Found it! Part number is 453100 on at least 8020 and 8022 possibly
loads more. Manual download for old models here.

http://us.fluke.com/usen/support/manuals/default.htm

Bob

Bob Minchin wrote:

Bob Minchin wrote:

Terry D wrote:

I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which
obscures the =/- signs. The black area is always visible, even with
the instrument switched of. Is there any way to correct this
problem? The cost of replacing the display would be prohibitive,
even if I could source one and I could probably buy another Fluke
from eBay quite cheaply.

Terry D.

It is not possible to correct a display that has failed in this way.
We used to sawp them out at work for new ones but our stocks are long
gone as this was a regular fault. Getting a spare from a otherwise
faulty one on ebay would be a good way to go. You might find it worth
while to find the partnumber of your display and see if it is used in
other flukes of a similar vintage to give you a wider range to target
on ebay.
I have an 8020 which I'm pretty certain has the same display. A brief
search has not turned up my manual so I can't give you the part number
to compare.

Good Luck

Bob


Found it! Part number is 453100 on at least 8020 and 8022 possibly
loads more. Manual download for old models here.

http://us.fluke.com/usen/support/manuals/default.htm

Bob
If you are confident with some simple electronics, then you could
perhaps add a single LED to replace the sign segment. you need to locate
the sign segment drive and the backplane (common) on the display. these
are both squarewave signals and when in pahse the display is blank and
out of phase the display is black. Use a CMos exlusive-or gate to drive
a transistor to switch a LED. Bear in mind that the dvm chip will have
no significant drive capability and is easily damaged.

hth

Bob

"Bob Minchin" wrote in message
...
Bob Minchin wrote:

Terry D wrote:

I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which
obscures the =/- signs. The black area is always visible, even with the
instrument switched of. Is there any way to correct this problem? The
cost of replacing the display would be prohibitive, even if I could
source one and I could probably buy another Fluke from eBay quite
cheaply.

Terry D.

It is not possible to correct a display that has failed in this way. We
used to sawp them out at work for new ones but our stocks are long gone
as this was a regular fault. Getting a spare from a otherwise faulty one
on ebay would be a good way to go. You might find it worth while to find
the partnumber of your display and see if it is used in other flukes of a
similar vintage to give you a wider range to target on ebay.
I have an 8020 which I'm pretty certain has the same display. A brief
search has not turned up my manual so I can't give you the part number to
compare.

Good Luck

Bob

Found it! Part number is 453100 on at least 8020 and 8022 possibly loads
more. Manual download for old models here.

http://us.fluke.com/usen/support/manuals/default.htm

Bob

Thanks for the info - I've downloaded the manual. Actually the LCD part no.
for the 8022B is 504324 according to the manual. Somehow I don't think I
stand much chance of obtaining a replacement, although I'll keep watching
eBay.

Terry D.

Terry D wrote:

"Bob Minchin" wrote in message
...

Bob Minchin wrote:


Terry D wrote:


I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which
obscures the =/- signs. The black area is always visible, even with the
instrument switched of. Is there any way to correct this problem? The
cost of replacing the display would be prohibitive, even if I could
source one and I could probably buy another Fluke from eBay quite
cheaply.

Terry D.


It is not possible to correct a display that has failed in this way. We
used to sawp them out at work for new ones but our stocks are long gone
as this was a regular fault. Getting a spare from a otherwise faulty one
on ebay would be a good way to go. You might find it worth while to find
the partnumber of your display and see if it is used in other flukes of a
similar vintage to give you a wider range to target on ebay.
I have an 8020 which I'm pretty certain has the same display. A brief
search has not turned up my manual so I can't give you the part number to
compare.

Good Luck

Bob

Found it! Part number is 453100 on at least 8020 and 8022 possibly loads
more. Manual download for old models here.

http://us.fluke.com/usen/support/manuals/default.htm

Bob


Thanks for the info - I've downloaded the manual. Actually the LCD part no.
for the 8022B is 504324 according to the manual. Somehow I don't think I
stand much chance of obtaining a replacement, although I'll keep watching
eBay.

Terry D.


Ah! I was looking at the 8022A.
Bob

Terry D wrote on 24/11/2007 :
I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which obscures
the =/- signs. The black area is always visible, even with the instrument
switched of. Is there any way to correct this problem? The cost of
replacing the display would be prohibitive, even if I could source one and I
could probably buy another Fluke from eBay quite cheaply.

I once had some success by warming the display such that I made it
warmer towards the centre combined with light finger pressure squeezing
the black out towards the edge. Something a bit hotter than an hair
dryer, but not so hot as a hot air gun is best. I then sealed the edge
of the display.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

"Harry Bloomfield" wrote in message
...
Terry D wrote on 24/11/2007 :
I have an old Fluke multimeter (8022B) which is still serviceable.
Unfortunately, part of the LCD display has a blackened area, which
obscures the =/- signs. The black area is always visible, even with the
instrument switched of. Is there any way to correct this problem? The
cost of replacing the display would be prohibitive, even if I could
source one and I could probably buy another Fluke from eBay quite
cheaply.

I once had some success by warming the display such that I made it warmer
towards the centre combined with light finger pressure squeezing the black
out towards the edge. Something a bit hotter than an hair dryer, but not
so hot as a hot air gun is best. I then sealed the edge of the display.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk


Thanks for the tip. I'll give it a try - nothing to lose really!

Terry D.