Having problems getting this laptop to power on with just the battery. I have swapped the charging chip BQ24760 out but it's exactly the same. Voltages in the picture are whilst plugged in to charger. Are they correct?
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Re: Acer not working off battery
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Re: Acer not working off battery
test voltage on PL4002 & PU4002 page 40 SchematicComment
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Re: Acer not working off battery
Many thanks for your response Techtiger. They both measured 2.7v and PU4002 has 19v on the other side. I swapped out PU4002 and it was showing 2.9v until I connected the battery then went back to 2.7v. Still shows 2.7v with battery connected and disconnected.
Is this going to be a case of swapping out PL4002 at the same time as PU4001 and PU4003?Comment
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Re: Acer not working off battery
Did you try to replace the battery?OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: Acer not working off battery
Does the laptop give you any LED indications for the battery status when plugged into charger? Solid/flashing battery LED? As Piernov suggested, try different battery as that 2.7V is way undervoltage for a 2s battery.Comment
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Re: Acer not working off battery
Try measuring battery plugged out. Could be battery is dead. If you have no voltage, that means battery protection circuit is shut, because battery is discharged to the point of being dead.
That means, new battery.Comment
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Re: Acer not working off battery
On some acers there`s a small micro switch that presses in when you fasten down the cpu/mem cover. With cover off the switch is up,the battery doesn`t charge.Comment
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Re: Acer not working off battery
test BQ24760 working conditions pin
2 4 5 8 15 36 42 for voltage after test coil PL4002 For resistanceComment
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Re: Acer not working off battery
PL4002 is 2.7ohms
The pins of BQ24760 are a bit confusing. There are only 40 pins that I can see although the schematic says there are 43. I have taken the measurements of the numbers you've asked for where pin 1 = the white painted arrow on the board and the pin 42 you ask for I've given you pins 39 and 40.
2 = 0v
4 = 2.6v
5 = 0.1v
8 = 3.4v
11 = 2.8v
15 = 6v
22 = 2.8v
36 = 19v
39 = 3.3v
40 - 0.5vComment
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Re: Acer not working off battery
PLED1 is blue when just the charger is plugged in. Both PLED1 and PLED2 are blue when the battery and charger is plugged in. I did at one time see PLED2 flash red a couple of times after plugging in the charger and then went to steady blue.
The only battery I've managed to find is China and I'm waiting to hear back from the customer as to whether he wants me to order one.
What should the 2.7v be - 8.4v I'm assuming?Last edited by kalemaroni; 03-31-2019, 06:33 PM.Comment
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Re: Acer not working off battery
try to charge battery with PSU, check thread called "battery charging with psu"
2,7V is way low. when u have good voltage on it even charging may start workComment
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Re: Acer not working off battery
did u try to trigget battery charging switch pin?Last edited by ktmmotocross; 04-01-2019, 06:38 AM.Comment
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Re: Acer not working off battery
Its SW1 ,page 82.Also look at page 39 ,BI_BTY1_R ,hole H4
http://tipstash.blogspot.com/2014/08...at-random.htmlComment
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Re: Acer not working off battery
Bridge the 2 sides of the hole with tweezers or a jumper and press SW1 ,keep it held down. See if it starts to charge .Attached FilesLast edited by SMDFlea; 04-01-2019, 08:34 AM.Comment
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Hello Everyone
First I must say I am trying to learn electronics. I have an Acer Nitro 5. Board is LA-861P. The laptop does not charge but when it has battery life it would power on and work fine. I have use a multimeter to check the charger and I get 19v.
Input on PBQ3 mosfet is 19v but no output or very low voltage. The voltage on PCZ65 and PCZ48 is 2v and it keep dropping after putting the charger for a few second. Battery pin would give like 0.200v declining.
If I put the laptop off for like 2-3 months it would start charging again but I need to do this... -
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These voltages are when the Battery is plugged... -
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