Re: lenovo yoga 2 13 Check this Out?

It ended on no signal from CPU leg, well ..., i tried, i got voltages on everything, i may messed up and shorted it

Re: lenovo yoga 2 13 Check this Out?

checked resistors, they are okay

Re: lenovo yoga 2 13 Check this Out?



i didnt foresee this witchcraft, i will check them and report thanks for tip
i still need to wait for two IOs from china ...

Re: lenovo yoga 2 13 Check this Out?

i transplant P301 from good board to bad, well, it started heating PU401 , i have it on bench supply with current limiter to 300ma, nothing blow, but it started clipping. after 30 sec it stopped clipping and PU301 is dead again.
I traced 10ohm short on +3VLP, i tried remove reset circuit, L38 coil, and after removing KB9012QF A4 short was gone, yeah, this one needs programing .... ordering supplies from aliexress

Re: lenovo yoga 2 13 Check this Out?



hi, have you solve problem? i have similiar problem, but my blown cap was filtering LCD backlight voltage C1159, 4u7 25v. and i came to similair conclusion about PU301 / BQ24715.
I can see voltago on VIN to ACDET pin6, but no voltage on pin5 ACOK, ic is getting power on VCC. On bad mothebord, there is 10V on PQ101 pins 2and3.

I also have secon motheboard that is OK but with lover HW specs, and on that board on PU301 pin 5, there is 2,5V, and i dont have voltage on PQ101 pins 2and3.

im gonna...

Re: Lenovo Yoga 2 Pro schematic and boardview

i have been too optimistic with swapping lcd
and i now know story behind yoga 2 pro death, previous owner ,,repaired,, adapter and notebook died on over voltage, it lived short on battery, then died

Re: Lenovo Yoga 2 Pro schematic and boardview

hmm, sorry to hear that, yes i have 8,5 V Vin, mosfets looks okay, i tried reflowing cpu, but nothing, only that one chip is heating like hell. I accidentaly touch some resistors near it and one fan turned on
im wondering, can i swap cpu to normal yoga 2 13? i know its soldered on i have usable equipment, in my yoga 2 13 is i5 4210u 3MB cache and only 4gb ram :/
or LCD screen ? it have different cables, but eDP should be same on lcd pannel, swap 4k to yoga 2 with 1080p sreen
i will wait for IC from ebay, Now...