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John Robertson John Robertson is offline
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Default Tektronics THS720 scope display issues...

On 2021/03/27 7:44 a.m., wrote:
On Saturday, March 27, 2021 at 1:35:46 AM UTC-4, John Robertson wrote:
A friend of mine in AU just asked me about

"Tektronix THS720 handheld digital oscilloscope. As you can see in the
attached photo, the LCD module is starting to go bad. Research indicates
that the problem is likely due to the polarizer films deteriorating, and
they can be replaced"

Anyone have any other suggestions? The image in the photo showed a clear
image, just fading on part of it. I suggested the inverter be checked,
but am no expert on these units.

Thanks!

John :-#)#


Any way to post a pic John? I have that model and would be interested in seeing the issue.


Yes, of course - here is a link to the image he sent me.

https://www.flippers.com/images/dele...nix_THS270.JPG

I'm sure he will appreciate any advice, he replied to me:

"Yes the display is illuminated by a small Cold Cathode Fluorescent Lamp
which is working normally. The problem is that the centre area of the
display is going darker and darker while the perimeter is still OK.

I'll keep looking for info about polarizer film...."

Thanks!

John :-#)#

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