LG Q6 boot problem - LG G6 Questions and Answers

Hi,
i have LG Q6, at the time it wont turn it on. When i turn on vibrates and show logo for 1/2 secund, than black and vibrate again in 10 sekunds. Than is black and again vibrate maybe on 20sec or 30sec.
If i plug in charger on vibrates once, than black and again like if i turn it on. I think that was dead battery and i replace it and same problem.
I hold voluime dome and power on to go in hard reset menu and if i choose yes, and one more time yes then phone turn off.
If i go in download mode i only see for 1/4 seconds ' download mode and than goes black and vibrates once.
if i go in safe mode pwr, after logo vol down - nothins happend, when turn on i just see logo for one second and than black, i press vol down when see logo but go black and vibrate once and thats all :/
What to do ?

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