IBM R50e schematics

[rtstorm]

Hello, please i need schematics for this laptop it wont start.

Thank you

[atsio]

Re: IBM R50e schematics

https://www.youtube.com/watch?v=NRmkjYiYGhE

[rtstorm]

Re: IBM R50e schematics

thanks, i found that on page 67 i have only input V+ 16V (this laptop has 16V adapter) but no output on that MAX1631 IC. I have some small voltages coming of but nothing above 1V

[atsio]

Re: IBM R50e schematics

thanks, i found that on page 67 i have only input V+ 16V (this laptop has 16V adapter) but no output on that MAX1631 IC. I have some small voltages coming of but nothing above 1V

What are the voltages on pins 9,21,23 of U41?
What are the voltages on pins 52, 57, 59 of U61?

[rtstorm]

Re: IBM R50e schematics

On U41 pin 9 is 0V, pin 21 and 23 are oscilating from 0V to 0.2V
On U61 pin 52 is 0V, pin 57 is 15,9V and pin59 is 0V

[atsio]

Re: IBM R50e schematics

Which IC is U61?

[rtstorm]

Re: IBM R50e schematics

it is toshiba tb62501f

[atsio]

Re: IBM R50e schematics

I think your problem is the Toshiba but better check it first.
Check on U61 voltages on pins 1, 2, 55, 52, 54, 44, 58.

[rtstorm]

Re: IBM R50e schematics

pin 1 - 0V
pin 2 - 0.3V
pin 55 - 0V
pin 52 - 0V
pin 54 - 5.6V
pin 44 - 0V
pin 58 - 0V

[atsio]

Re: IBM R50e schematics

Give voltages on all pins of U42.

[rtstorm]

Re: IBM R50e schematics

U42:
pin 1 - 15.93V
pin 2 - 16.38V
pin 3 - 16.38V
pin 4 - 0V
pin 5 - 0V
pin 6 - 0V
pin 7 - 0V
pin 8 - 0V
pin 9 - 0V
pin10 - 0V
pin11 - 0V
pin12 - 3V
pin13 - 0V
pin14 - 0.2V
pin15 - 0V
pin16 - 0V
pin17 - 0.2V
pin18 - 0.2V
pin19 - 0V
pin20 - 0V
pin21 - 0V
pin22 - 0.3V
pin23 - 0.2V
pin24 - 0.2V

[atsio]

Re: IBM R50e schematics

I think your charger is dead and you must change it.

[rtstorm]

Re: IBM R50e schematics

you mean this U42 (High Frequency Switch Mode Li-Ion Battery Charger)

[atsio]

Re: IBM R50e schematics

Yes. It sends signal to enable U61 which sends signal to enable MAX.

[rtstorm]

Re: IBM R50e schematics

hi, i replaced the U42 but laptop still wont start

i check U41 and U61 all voltages are still the same. I test this widouth pushing start button is this ok?

[atsio]

Re: IBM R50e schematics

What are the voltages on U42?

[rtstorm]

Re: IBM R50e schematics

U42:
pin 1 - 16V
pin 2 - 16V
pin 3 - 16V
pin 4 - 0V
pin 5 - 0V
pin 6 - 0V
pin 7 - 0V
pin 8 - 0V
pin 9 - 0V
pin10 - 0V
pin11 - 0V
pin12 - 0V
pin13 - 0V
pin14 - 0V
pin15 - 0V
pin16 - 0V
pin17 - 0V
pin18 - 0V
pin19 - 0V
pin20 - 0V
pin21 - 0V
pin22 - 0V
pin23 - 0V
pin24 - 0V

i this this is bad IC too, whyt did you think i have input (VCC, SYS+ and SYS-)

Maybe i have some solder bridge between pins, i this i should have some output from IC

[atsio]

Re: IBM R50e schematics

Which ADP charger IC are you using as replacement?

[atsio]

Re: IBM R50e schematics

From the charger datasheet:

"System Current Sense
An uncommitted differential amplifier is provided for additional
high side current sensing. This amplifier, AMP2, has a fixed gain
of 50 V/V from the SYS+ and SYS– pins to the analog output at
ISYS. ISYS has a 1 mA source capability to drive an external
load. The common-mode range of the input pins is from 4 V to
VCC. This amplifier is the only part of the ADP3806 that
remains active during shutdown. The power to this block is
derived from the bias current on the SYS+ and SYS– pins."

[rtstorm]

Re: IBM R50e schematics

I use the same ADP3806 charger.

So it must have some output when laptop in stand by?