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Hp dv2000 no display in adapter mode but ok in battry mode

Hp dv2000

Board - Akita 945



Power on but no display in adapter mode

In battery mode laptop ok



Diagnosis



If board start with battery then display OK and put adapter also display OK



If remove adapter then once again insert board no display



Steps



Change all the mosfet of adbat and vin section but same isuue



Change charging ic but same issue



Then I check the 51120 ic pg pin11 - 2.9v in battry mode

But 1.8v in adapter mode



So that change the 51120 ic then check same issue



then I cut the track pin 11 from 51120 and 3v generate in pg section

Then check also same issue



This pg voltage is cpucore on voltage so I changed the core ic max8763 also same isuue



Then I checked the core voltage in battry mode is 1.2v but in ac mode.90v



So suspected issue is in vrm core section



Then I change CPU also same issue



After that change all capacitor and mosfet in CPU core section but same issue


After frosted then I add one capacitor behind CPU socket and work done

Now board ok

Nice job sir

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Nice job sir

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useful information

niceee sir

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beautifully its rare case
thank u sr..

thanks to all

you are very amazing

nice job sir thanks for shering

Nice job

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