IBM R50e schematics

[dj_ricoh]

Re: IBM R50e schematics

Q4
pin1 - 0.3V
pin2 - 0.56V
pin3 - 0V
pin4 - 0V
pin5 - 0.3V
pin6 - 0.3V
pin7 - 16V
pin8 - 16V

L5 coil have 0.3V on both side

its that fet ok?

keep in mind that`s a dual N-channel fet

[atsio]

Re: IBM R50e schematics

@ atsio

Q13
pin1 - 2.99V
pin2 - 2.89V
pin3 - 2.89V
pin4 - 1.2V
pin5 - 15.96V
pin6 - 15.96V
pin7 - 15.96V
pin8 - 15.96V

R422 i cannot find (KODIAK program wont display it)
R453 one side is 16.3V and other side is -7.8V

I did not use the battery while i was testing.

What is KODIAK?

Remove D10 and D19 and inject 16v with regulated power supply (use quite thick cable for say, 5 amps) to pin 3 of D10 and check if laptop starts.
After, check voltages on pins of U61 I asked for in my previous message.

[rtstorm]

Re: IBM R50e schematics

i try to remove D10 and D19 then i inject 16V on pin 3 of D10 laptop wont start.

U61:
pin57 - 16V
pin34 - 16V
pin55 - 0V
pin52 - 0.5V
pin54 - 4.4V
pin10 - 0.2V
pin11 - 0.1V
pin44 - 0V
pin58 - 0V
pin59 - 0V

Kodiak is the software i use for fide the device on MB. there is no marking on MB itself.

[rtstorm]

Re: IBM R50e schematics

@ atsio


R453 one side is 16.3V and other side is -7.8V

this R453 has F marking on it (probabbly fuse) wont pass continuity test. i think it is dead

[rtstorm]

Re: IBM R50e schematics

this R453 has F marking on it (probabbly fuse) wont pass continuity test. i think it is dead

i bridge the F but nothing changed, still no power on MB

[rtstorm]

Re: IBM R50e schematics

hey where is the BIOS IC? is it U15, U53 or U3? maybe i sloud chek bios?

[rtstorm]

Re: IBM R50e schematics

please help me extract dump file from this