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Hie I have a Lenovo laptop
Lenovo Ideapad 100-14IBY AIVP1-AIVP2 LA-C771P rev 1.0
it's working only on the bench power supply when I put the battery it doesn't power on. when I also use the original charger it doesn't power. the batter Is fully charged, I used another laptop to charge the battery. but when I use a bench power supply it works perfectly
below are my readings
with the original charger only
JBATT1
PIN1 0.22V
PIN2 0.22V
PIN3 0.45V
PIN4 0.45V
PIN5 O.43V
PIN6 0V
PIN7 GND
PIN8... -
Hi all, I have a HP 15-cb028nl (dag75ambad0 rev. d) that turns on but does not charge the battery. The laptop arrived with the super I/O (ITE IT8987E BXA) burned. After replacing the EC, it turns on but does not charge the battery. Below are the voltages on the pins of the bq24738h, with and without the battery inserted:
...WITHOUT BATTERY WITH BATTERY PIN1 (ACN)= 19.76 V PIN1 (ACN)= 19.76 V -
DEVICE: Laptop
Model: lenovo thiinkpad t410
Board Id: 09A33-3 48.4FZ09.031
NZM1H-8
ISSUE: NO POWER
From the first mosfet 20v is not passing through, pin 4 has 19.5v and the first mosfet is a P-CHANNEL mosfet (SI7121DN) i think the pin 4 should be lower to active the 1st mosfet to allow the 20v to pass to second mosfet ive check all for shorting in the board , i did;nt find in rails, so ive check the schematic and im suspecting that, my Q61 is faulty due to its pin 1 is 0.47ohms? im not pretty sure, hope someone can help me figure out this issue.
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Good morning!
A customer just brought in an Honor MagicBook X 16 mod. BRN-F56, motherboard P/N Fermi_MB NB6269A_MB_V4, not working (no power LED, no charging LED, nothing)
He said he had been using an aftermarket power supply for a while, but noticed that it suddenly stopped charging and when the battery was completely dead the laptop would not turn on, even with the original (working) power supply.
On the power connector, on the motherboard side, I measure 20V.
With the thermal imaging camera I found a component labeled 2920J (TSOP5) that, when I supply power, increases...01-29-2025, 03:41 AM -
Hi all,
I have this OWON HDS2202S oscilloscope that worked fine until it was used with the wrong probes mounted in the wrong place.
It is not completely dead, it still fulfills some functions. I opened it and found some damaged components inside. I have identified the rest but I cannot identify this IC. I don't think I can find the diagram, but can someone help me identify this component?
It seems to be an LDO regulator. I identified it like this:
Pin1 - Vin
Pin2 - GND
Pin3 - ? (connected with pin1)
Pin4 - ADJ ? (resistive divider between Vout and...
Working...
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