I had the same problem with my TSU 9400. the red light of the dock station turning off after one second, and the unit remaining totally discharged.
As it's my third remote of the same model, the first and second were defective because of continuous loss of calibration, this dramatic situation (100% defective products!!! and no pronto maintenance service in France) with a stock of spare parts, gave me the opportunity to run some tests :
- replacing the battery is useless
- the loss of calibration is directly related to the screen
- only replacing the system board solved the charging problem

gdnsa