Hello,
Few Weeks ago I finally had the chance to acquire a THS720A with the Probes, Leads and 2 Batteries that are still holding charge quite good, for a reasonable Price but the Backlight CCFL is dead ! The Scope and the Accessories (the ones I received with) are in Great Condition, FW 1.08, made the conversion to 720P.
I reverse Engineered the existing CCFL just to see what is done and made a 1:1 Drop-in Replacement Converter for the LED Strip Backlight. I used a 12V 3mm thin LED Strip cut down to Length, this way the White CCFL Plastic Holder can be used again.
The Led Strip I used is the :
https://www.aliexpress.com/item/4000912596869.html another option is this one :
https://www.aliexpress.com/item/1005003193200776.html didn’t used it because the first one is very good
The LED Strip can be Driven up to 15V with nothing getting really warm, at 12V Output the LED Controller draws ca. 120mA with 5V Input and ca. 40mA with 12V Input.
Attached Pictures of the Conversion and the LED Controller.
The Reverse Engineered CCFL in the last Attachment.
Here a short Video i've made on the matter.
Cheers,
Konstantin