motorola v8 discharges battery

[macdan]

Hi all,
i have a motorola v8 that discharges battery and heats up while charging, it hardly retains current in the battery, what could be the possible solution of this phone, schematic diagram indicating possible ic damaged or jumpering would be highly appreciated,
macdan

[katod]

http://www.shrak-mobile.com/eng/schem_motorola.html
here you can find the schematic...
BR. katod.