The Treo 90 had a problem with backlight failure, which Handspring acknowledged and began fixing back in 2002. However, their guideline was that if your 90 did not fail within 6 weeks of use, it did not have the defective part responsible for the failure.
Your backlight probably has just died of old age. It is EXTREMELY difficult to replace just the backlight (I've tried). If you search long enough on eBay, though, you can probably find a 90 with a broken case, dead battery, broken motherboard, or some other ailment, but with a functioning screen/keyboard assembly, including backlight. It's a pretty simple matter to replace the screen/keyboard assembly (there's a screw hidden under the battery that holds it into the front frame).
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Try changing the display brightness.
Press "Function" + "P" and change it with the left and right controller on Treo's center. By "Function" I mean the lower left keyboard key.
My Treo started doing this a while ago, sometimes the backlight simply goes off. I found that this is more frequent when you use a high brightness setting.
This is probably caused by a bad "inverter" board inside the screen housing.Don't worry they are relatively inexpensive and easy to replace.
However, some laptops have a failure on the motherboard which causes the backlight to go out,because the inverter,which powers/controls the backlight,depends on power and a PWM signal from the motherboard.
Backlight problems are almost never caused by the backlight itself.
I's sorry to tell you your screen is dead. The screen is not displaying any information but the backlight is still functioning. This is the most expensive part of the phone as far as replacement parts and after-market parts. If you can fine one that is a reasonable price, you are very fortunate.
I have three screens like this at home. There are three layers to the screen, the backlight, the imager, and the digitizer. All three sandwiched together create the screen.
If the phone was on when you fished around the charge port, it is possible that you inadvertently caused a charge or grounded the charging/power circuit. You are fortunate that only the screen was damaged...if that's the only part that is damaged.