lenovo yoga 500 not charging

[hgzy ahmd]

this problem repeated in this model
I replace battery but not fix the problem
replace charging ic bq24780 but not fix it
I flashed main bios not fix it
software like the Power Management not fix it
all measurable components are good ( mosfets - resistors - ... )
I have two notebooks with the same issue

please what's yours suggestions?

 

[B4RDOCK]

nuvoton have 3.3v ?

 

[hgzy ahmd]

nuvoton have 3.3v ?

yes dear there is 3.3 charging id on RN2403

 

[hgzy ahmd]

nuvoton have 3.3v ?

NOTE:
notebook is working will , and working on charged battery ,

I replace io and fleshed bios over windows but the same ,not charging

 

[B4RDOCK]

NOTE:
notebook is working will , and working on charged battery ,

I replace io and fleshed bios over windows but the same ,not charging

with schematic can check all signals and maybe can fix it

 

[hgzy ahmd]

with schematic can check all signals and maybe can fix it

here is schematic for bq24780

http://www.ti.com/lit/pdf/tidrh84

but i dont found schematic for this model

 

[zmogienas]

Hello! Found the solution?

 

[soupapowa]

Hello,
Your problem is complicated...
I think you have to find components (MOSFET, Capacitor) nearly the battery.
And try to check that, maybe one component is broken.

 

[MOBOKAP]

I have found the solution . After PD4403 have an resistor 10 ohm . my resistor was 560 OHM. and BQ 24780 dont have 20V VCC in pin 28 .

 

[B4RDOCK]

I have found the solution . After PD4403 have an resistor 10 ohm . my resistor was 560 OHM. and BQ 24780 dont have 20V VCC in pin 28 .

thanks for share knowledge

 

[gligurski]

Beautiful and elegant solution. Thank You very much. Worked like a charm straight away. Found the resistor, mine was around 460 Ohm, replaced it with 10 Ohm, charging started immediately. Thank You again.

 

[Deppe92]

I have found the solution . After PD4403 have an resistor 10 ohm . my resistor was 560 OHM. and BQ 24780 dont have 20V VCC in pin 28 .

You Sir, won the Internet! Keep up the good work!

Mine had 7k Ohm

 

[xiaocao1021]

beatiful

 

[CLRuiz]

I have found the solution . After PD4403 have an resistor 10 ohm . my resistor was 560 OHM. and BQ 24780 dont have 20V VCC in pin 28 .

Your solution works like a charm... My resistor was 15K. After changing it, the battery is charging again. Thanks a lot!!!

 

[SearchForPattern]

Thanks for the solution.