Blackview failure. red LED is on, not booting (model DT01 a12 chipset)

[dariod]

hello everyone.
used over a year now, good video now stopped all together.
its got constant red led on (till built in battery lasts). if connected power supply then blue led comes on but no booting. if pressed reset button, red led goes off. but if pressed ON button comes on again.
removed built in battery, checked it is good. charges and discharges to about 220mA so plenty live there.

any ideas ? where to look for problem? maybe low voltage detector ?

(had battery failure on mini 0806 behaved erratically , replaced battery and working fine again in my partners car)

 

[amyscott]

Have you solved this problem or not? Because it is really strange

 

[dariod]

not solved