hi every one i have D620 laptop with this problem ... laptop boot up fine but battery show me plugged in not charging. in first screen i see message ADAPTER NOT DETERMINED i change the ac adapter with new one but not help i change battrey. change OS. and bios updated. but not help i open the laptop and the dc connector its fine connected. i change charger ic and clean board but not. help

please help me how to solve this problem.... in advance please ???

- how to solve this problem? -

You need to repair ID adapter circuit. Usually, this circuit damaged by short circuit between +19V and ID pin (central pin in adapter plug). Check an elements in the left up corner at the sheet 44.

Good luck!

thanks i will try

i see this page


but whats important to check in this sheet ?
is any important point to check ?

Have a oscilloscope?
Check the PS_ID sequence at the source of the PQ1. This is 1-wire bus, the eprom in AC adapter contains information about model. By request MICOM the eprom transmits ID in serial code. After the short circuit, all of components (PD53, PQ1, PQ2, PD2, PD41 ) may be damaged. However, in the worst case, the MICOM ( U216 @ P39) may be damaged too.

hi i haven't oscilloscope ... can check with voltmeter ??/
no PD41 diode on the board is that corrected?

-- no PD41 diode on the board is that corrected?
Yes! It is not a problem!

--i haven't oscilloscope
This is not good! Many methods without oscilloscope are not available!
If you are the professional repair engineer, you need have an oscilloscope!

-- can check with voltmeter ??/
In this case, I can propose to you only one test - check the resistance between PS_ID and ground. And check a transistors.

ok i will try and next week will buy a CRO
what model you confirm it ?

-- next week will buy a CRO
CRO? Does it mean Cathode Ray Oscilloscope?
I am strongly recommending buy cheap Digital Oscilloscope!
For example, Rigol DS1052E

thanks for help very thanks ..

the customer of laptop not give me time to repair and i close laptop

Good Luck!