I got a lenovo g50-80 that shows charging led (orange LED flashing) and when I press the power button the white LED comes on but the laptop doesn't switch on. The fan spins for 2 seconds when I press the power button then it stops. This problem started when my charging dock broke the connecting wires and i soldered these wires back but I might have mixed them. I ended up buying a new charging dock but laptop never switched on it just shows flashing orange LED when charger is connected. Could the super io be bad? I don't know how to go about diagnosing and I can't check any board view since this was my personal laptop that I was using. Please assist with where I should check (if soldering is need then don't worry about microsoldering I can solder and remove chips perfectly)
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Connect the power adapter. Carefully measure the voltage to ground of each mosfet pin at pq301.
Source
Gate
Drain
This is the first dcin mosfet for the charger ic at PU301.
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This is a p-channel mosfet so this is ok. The mosfet is enabled. Next test PQ302. Same measurements.
Then remove all power, measure the resistance to ground of the main power rail (at ACN) of PU301. No power in resistance mode checks.Comment
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You mean dc jack wires broke? Right?
If so, there is a high probability od SIO goinf bad(AD_ID touched with main power rail).Comment
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AD_ID
Usually, if the dc jack pin of 19V touches the central pin of dc jack(AD_ID)-sio definitely goes bad.
AD_ID pin from dc Jack goes to SIO and in turn it understands the rating of adapter being used.
So very very likely you need to Replace the SIO.
This SIO needs programming.Comment
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
Hy guys, i have this lenovo TB-X605F with charging problem, the tablet is fake charging, i have replaced the charging connector twice, it only draws 0.40 Amps when pluging the cable for the first time then it stops drawing any Amps but the tablet keeps showing the charging image at 0% as long as i keep it connected. I have no voltage at the battery connector with the cable pluged, but i have 5 volts after usb connector on some testing points on the board.
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I have Lenovo ThinkPad X1 Nano Gen 1 which is not charging on 1 usbc port (the one that has mark for charging).
When i connect usb it switchs to 20v but no current draw (only 0.02a) and orang light is on. In windows it shows that is charging but percentage is dropping.
Other usbc is charging fine,
I installed lates bios and firmwares for thunderbolt and battery.
Could be faulty JHL8040R controller?08-31-2024, 11:08 AM -
I have a think pad t14 gen1, mainboardboard NM-C931 REV 1.0, I replaced the damaged USB-C charging socket, I still have a problem with charging only 5V. Where to look for the fault? Which electronic component is responsible for charging negotiation?
here is schematics an boardview
https://www.badcaps.net/forum/troubl...98#post1768898 -
Lenovo E15 Gen.3 NM-D481 No starting and charging via USB-C, The device starts only via the battery.I have a Lenovo E15 Gen.3, motherboard NM-D481 with a defective USB-C port. The device starts with battery. When connected to the USB-C power supply, it does not start or charge. 20V is present at the input of the UT5 (High voltage USB PD power switch), 0V at the output
UT5 pin 3 (SNK_PS_EN) =0V
RPT3 Pin1+2 LDO 3V3 present
I suspect that the UT2 USB-C power controller is defective because the UT5 is only controlled by the UT2. However, the UT2 supplies on pin 33 (+LDO_3V3) which makes me wonder if it is defective after all. Unfortunately I don't have it here to test it.
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