help! Hp 820 g3 will not start

[O.Szilard]

Hi! Please help! Hp 820 g3 will not start. pressing the power button does not turn on. if the battery is removed and then reinserted, the machine will start automatically until it is switched off with the power button. bios is good, power button is good! rtc battery is good!
has anyone encountered such an error? so: the machine only works if we unplug it and reinstall the battery, then it will turn on automatically, windows will load. if stopped, it will no longer start.

[stingerchamp]

Re: help! Hp 820 g3 will not start

Hi! Please help! Hp 820 g3 will not start. pressing the power button does not turn on. if the battery is removed and then reinserted, the machine will start automatically until it is switched off with the power button. bios is good, power button is good! rtc battery is good!
has anyone encountered such an error? so: the machine only works if we unplug it and reinstall the battery, then it will turn on automatically, windows will load. if stopped, it will no longer start.

Hi ,

First we have to localize the fault which thing is causing fault either battery or power adapter.

1-Remove the battery and turn on with Power adapter alone
2- Remove the power adapter and start with only battery make sure battery is fully charged.

If first works , battery need replacement
If second works, power adapter need to be changed or examined.

[mcplslg123]

Re: help! Hp 820 g3 will not start

Is there a separate RTC cell on this mb or RTC is integrated in main backup battery?? IF RTC is integrated in main backup battery, then removing it means you are resetting RTC-so likely fault will be in RTC section. However, if there is separate RTC Cell, then you can ignore this aspect.

[O.Szilard]

Re: help! Hp 820 g3 will not start

Hi! does not start from the battery (full charge) and does not start from the charger. Even if it is unplugged and you either replace the battery or plug in a charger without a battery, it will start immediately without pressing the power button. there is a separate RTC element whose voltage reaches the nuvoton chip. mystery......
mn in review, there is no corrosion oxidation ..... but maybe the fault has something to do with rtc. suspicious Nuvoton chip?

[stingerchamp]

Re: help! Hp 820 g3 will not start

Hi! does not start from the battery (full charge) and does not start from the charger. Even if it is unplugged and you either replace the battery or plug in a charger without a battery, it will start immediately without pressing the power button. there is a separate RTC element whose voltage reaches the nuvoton chip. mystery......
mn in review, there is no corrosion oxidation ..... but maybe the fault has something to do with rtc. suspicious Nuvoton chip?

Before we start processing on laptop motherboard it is in our benefit to check all possibilities of laptop condition gets normal without checking motherboard itself.

1- Go in Bios settings and load default settings and change power settings in windows too.

2-Try Hard Reset

Remove all accessories , remove battery and RTC cell.

( check voltage on RTC cell using a multimeter it should be greater than 2.8 volts)

wait for 30min

after 30min ,insert Cmos cell again and Press power button for 30 second and release the button now start the laptop it will work.

[mcplslg123]

Re: help! Hp 820 g3 will not start

Having good voltage on RTC cell is not enough. You need to check RTC_RST# as well as SRTC_RST#. Look for a triangle shaped jumper near PCH. thats your RTC_RST# location.

[stingerchamp]

Re: help! Hp 820 g3 will not start

Checking of voltage present at particular signal level is not required before hand.

[O.Szilard]

Re: help! Hp 820 g3 will not start

voltage is OK, it is difficult to find a fault in the absence of a circuit diagram

[mcplslg123]

Re: help! Hp 820 g3 will not start

Checking of voltage present at particular signal level is not required before hand.

Can you please elaborate on this??

[stingerchamp]

Re: help! Hp 820 g3 will not start

Can you please elaborate on this??

you will not understand it as it is related to DSP and this forum cant teach you DSP .

[mcplslg123]

Re: help! Hp 820 g3 will not start

Thanks for enlightening us all at badcaps. Btw, i do know the whole conecpt of DSP.