Toshiba c840 not charging battery when power on

[String2016]

I need help on this please. i have here a Toshiba Satellite C840 laptop with BOARD IDABY3CMB8E0 REV:E.Everything works fine when charger only plugged in and with battery plugged in only, but the problem is you can charged the battery only with no issue with the laptop is off, but when it is power on and you plugged the charger it cannot charge the battery as one component is heat up. i have upload a image on the component on the board.please help

[smali]

Re: Toshiba c840 not charging battery when power on

check PQ5001 and PQ5002 may be short ?

[String2016]

Re: Toshiba c840 not charging battery when power on

I check pq5001 and pq5002 mosfet there is no short and not beeping on the multimeter.

[String2016]

Re: Toshiba c840 not charging battery when power on

anyone can help on this please already tried removing PQ5001 AND PQ5002 mosfet and test it but no short

[String2016]

Re: Toshiba c840 not charging battery when power on

anyone can help me on this please

[Techtiger]

Re: Toshiba c840 not charging battery when power on

Try to mesure The battery Coil for Ohms and the +- pins of battery connector Ohms to GND try to upload the Schematic

[SMDFlea]

Re: Toshiba c840 not charging battery when power on

Replace pd1 and the caps with corrosion .

https://cdn.badcaps-static.com/pdfs/...c3b4384ec2.pdf

[piernov]

Re: Toshiba c840 not charging battery when power on

It's normal for the diode to heat up a bit under high load, 0.5V voltage drop across the diode with 4A is 2W, so yes it'll make it heat up a bit. I see flux around there so make sure the diode is the proper one. Also if the battery is not charging while the computer is being used, maybe the battery is bad or the AC adapter is not the proper rating.

[SMDFlea]

Re: Toshiba c840 not charging battery when power on

PQ5003 looks like it needs rework as well .

[String2016]

Re: Toshiba c840 not charging battery when power on

@techtiger battery coil in ohms mode red probe to ground and black to both sides of greycoil mesured 0.255 both coils

[String2016]

Re: Toshiba c840 not charging battery when power on

@smdflea should i replaced PD1?this is heats up if i plugged the charger with the laptop is on but when laptop is shuts off it charge good

[String2016]

Re: Toshiba c840 not charging battery when power on

@piernov both charger and battery are good

[String2016]

Re: Toshiba c840 not charging battery when power on

the only problem with this board is not charging when laptop is on when i plugged a bench lab with battery plugged in taking amps and PD1 heats up.but when laptop shuts off and plugged the charger and battery and turn on its working fine and charge the battery without issue

[String2016]

Re: Toshiba c840 not charging battery when power on

anyone can help on this please

[String2016]

Re: Toshiba c840 not charging battery when power on

no one can help on this please

[String2016]

Re: Toshiba c840 not charging battery when power on

Problem solved on this it was PC22 is the culprit replaced it and now its working fine

[Techtiger]

Re: Toshiba c840 not charging battery when power on

Problem solved on this it was PC22 is the culprit replaced it and now its working fine

can you uplode the schematic, Great you solved it

[SMDFlea]

Re: Toshiba c840 not charging battery when power on

Schematic at post #7

[Techtiger]

Re: Toshiba c840 not charging battery when power on

Schematic at post #7

Thanks SMDFlea

[String2016]

Re: Toshiba c840 not charging battery when power on

now i have new problem with this laptop display becomes WHITE screen, already done replaced with new lvds cable still the same issue, replaced with new screen same issue, i have check on the schematic the LCDVCC is missing on pin23 on lvds connector, and on U26 chip here is the voltages

PIN1= 0V
PIN2= 0V
PIN3= 3.3V
PIN4= 3.3V
PIN5= 0V
PIN6= 3.3V

Noticed that the out the PIN1 Is the output of the chip because pin 2 and pin 5 is ground.does anyone help me on this to solved this problem please