hello,
VPCEB1E1E (mbx 224) works fine, but when working with battery, it emits a whistling sound when I plug the power supply stops whistling. I can not locate the whistle.
Can you tell me what component can whistle
many thanks


Привет,
VPCEB1E1E (MBX 224) работает нормально, но при работе с батареей, он излучает свистящий звук при подключении источника питания останавливает свист. Я не могу найти свисток.
Можете ли вы сказать мне, что компонент может свистеть
большое спасибо

It sounds like whistle or like clicks?

Because if clicks so you have a short-circuit

Hi,
i'm sorry for the translation , it sounds like whistle .

and what about anouther battery?

please, try to give more information, for excluding stupid questions. What about voltages. Battery is charging from laptop?

Now ,
laptop only start with battery .
If i connect only ac plug it doesn't start no light no power nothing , battery must be present .
The battery is not charged with ac plug.
Thank you for your help

first check PR18, PR20, PD18,.

Hi ,
now laptop doesn't start no lights no power.
I have check PR6 and PR4 there's no voltage.

sorry I wrote mistake.
You need:
check PR13, PR14 - this chain set signal ACDET for PU3 (BQ24753).
check PQ1, PQ2, PQ3
check PD18.
If thas all is ok - check VREF on PU3 (pin 10).
if Vref=0 change PU3.

Hi ,
I have change PQ1 , PQ2 , PQ3 , BQ24753

I have change PD18 but i'm not sure , see the photos
It's right ?

I don't find PR13 and PR14.
ACDET have 2.6v
Vref have 3.4v

best regards



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yes, that it.

Sorry i have write error : ACDET have 0.6v

So, you need find why ACDET is low.
possible reason: dead PR14, PR13.
here screen for your peace of schematic:

Thank you for part of schématic
I have replace PR13 and PR14 (look on the photo if they are the goods components)
Nothing change , i have already 0.6v on pin 5



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I`d replace the 24753 with new one.
Probably the ic was almost dead and then passed away forever.
The whistle could be as a result of a unstable or out of range frequency.

Hi ,
I have change few compenent near Pin 5 (with blue point on photo)
I have check voltage , can you see trouble on the photo ?
best regards



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