I don't have PR111 and PR112
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Remove all power and confirm the resistance across RE4456Comment
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98.7KComment
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Good resistance. Odd that the voltage is only 2v5 on the ACIN# junction.
Once the charger IC is OK with the adapter voltage, this line should float like an open switch. At that point, this pull-up resistor should soft park through the ~100k ohm resistor to +3v.
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I noticed that when the PC is turned on with the battery and charger, Windows shows the symbol of the battery charger inserted and says "Battery powered" and the battery does not charge. Can it help?Comment
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Carefully flux and remove RE4458. Do not lose this part. Then power up again and measure the voltage to ground of ACIN# signal. You should see ~3 volts here.Comment
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I don't have RE4458, but where the tip is I have 2.5V.
see you tomorrow
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I see - they have shorted the PCB with a trace between pins 1 & 2 on QE4402 to replace the 0 ohm resistor.
Remove all power & no battery. Meter in diode mode. Red meter probe to ground. Black meter probe to the same point as above. What is the diode mode measurement?Comment
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5.10Comment
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I found the diagram of the charging IC, PU100, and checking the voltages I realized that the ACDRV(pin4) should be 6V more than the battery charger, 26V in my case, but both with and without battery it is always 20V. I also tried turning on the PC with and without the battery and it works in both cases.Comment
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What a shame. 52 Posts with all this mess and finally it turns out being a shorted DC-IN Mosfet.
Since you stated both of these were replaced, I have to assume you replaced them with wrong model, soldered them with the wrong orientation or something else serious happened.
However, 19 or 20V at Gate Pin is per 99,9% a shorted DC-IN Mosfet. This exact issue is well known causing the battery not charging.
Move on and confirm please.Comment
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You're right, 52 useless posts.
I replaced them and tested them and they worked perfectly, now testing PQ100 and PQ101 again the source and gate are shorted, now I'll change them again and let you know.Comment
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All resolved, a mosfet was faulty.
Thank you for your help and above all for your patience. I learned new things and in the end this is more important than the repair itself. Thanks againComment
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I bought a Vostro 3400 motherboard (LA-K033P) to upgrade over my damaged Inspiron 5593 (LA-J091P) board. Everything else is ok except for the battery. This battery I am using now is already a replacement one since I disposed of the bloated original one. Back in the Inspiron 5593 motherboard, the battery charges fine and is identified just fine. However, with the upgraded motherboard, suddenly the replacement battery is labeled as "Not a dell battery". When I borrow a similar battery from my colleague (which did not have replacements yet), it is identified and charges just fine.
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Hi
Acer A515-43
LA-H801P
Fail: Does not charge battery, has low voltaje on connector.
Laptop didn't want to turn on, only charge led blinked.
I found PQB5 (mosfet high battery charger) in short, voltaje in +12.6V_BATT was 19 v ...
I changed it, changed PQB6 too and now battery charger voltage is 4.4V but battery is 3 cell, 11.25v, then is very low to charging.
Laptop turns on without battery and works fine, but with battery turns on and turns off inmediately, I suspect battery bad but I don't know... -
Lenovo Ideapad 320-15IKA
NM-B452
Hi guys. I've used the forum a lot but never asked questions before. I had a Lenovo come in that was shorted on the 20V rail. I fixed that and thought my job was done until I realized it wasn't charging the battery. Here is what I've checked so far
On the BQ24780SRUYR charging ic
VCC 20V
SMBUS lines
SDA 3.3V
SCL 3.3V
Current Sensing lines
ACP/ACN 2.3 ohms
SRP/SRN 21.2 ohms
REGEN line 6V
PHASE .84V with no battery installed(this may be normal)
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Hello,
i have similar problem as https://www.badcaps.net/forum/showthread.php?t=37828
QUOTED
-It works on charger (without battery connected-only charger)
-It works on battery (without charger connected-only battery)
-& it also works when plugged in battery & charger, but it's not charging the battery
//Confirming, i have same issue, but problem started from charger, centre PIN is outputing 10V+ and jumping randomly 19V
and..
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The IC cannot maintain the input current level... -
Hello All,
I have a unusual problem with a MacBook Air 2014 820-3437 that it will not charge the battery. I have 2 batteries that charge just fine in another 820-3437 so i assume that the batteries themselves are OK. One was new in 2020.
This board started off as a PP3v3_S5 short that was resolved (shorted capacitor) and came to life fine. While testing the computer I noticed that the battery was not charging so I checked the following components:
Current sensing:
R7121 10 ohm
R7122 10 ohm
R7151 2.2 ohm
R7152 0 ohm
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