Plug in A/C adaptor to ubit and with unit off, see if you can get a voltage measurement from the terminals that connect to the battery. If voltage is present, dead cells in battery. If no voltage present, suspect switching regulator. These units are hard to service due to parts availablity and cost of a replacement unit vs shop labor and parts charge.
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Are you sure it is not the charger itself at fault here?
If you have or know someone with a multimeter get them to check if any voltage is present on the charger plug of the cord. Batteries do not suddenly stop they usually give less and less time in uptime mode before they finally stop altogether. I would suspect the charger or charging circuit.yes it can be fixed
Good day sir, my guess is that your adapter is the culprit, if you have access to another charger please use it, if you may have the time, try to visit your dealer, and they be wiling to test your adapter. Other causes may be the charger DC port, or the battery, but let us stick first to the common adapter problem, hope this helps.
Rechargeable batteries can only be recharged so many times. They begin to slowly lose their capacity after about the first 5 charges until ultimately it won't hold a charge anymore. It appears that this is your problem. Look for a model number on the battery & do a Google search for it if you want to try & replace it. You might also find it is cheaper to buy a whole new DVD player than it is to buy a replacement battery.