Toshiba Satellite C640 No Power Need Help

[tiubxray]

Hello to all badcaps forums.

I am working on this laptop friend of mine, Toshiba Satellite C640 PSC2SL-017006.

Its been more than a week now to figure out what wrong with this laptop. Plug in the power adapter (voltage tested -pass) but no light from the power led. I disassemble it and I found out that a small chip get really hot (I attached pics).

The thing is, my friend use his laptop on the bed causing the ventilation blocked. And now the cost to repair it, it's like to buy a new laptop.

So any suggestions from the "MASTERS a.k.a SIFOO" of badcaps forum.

Sorry for my bad English. Thanks in advance.

May the CURRENT be with you!!!!

[dj_ricoh]

Re: Toshiba Satellite C640 No Power Need Help

that 51123 its actually TPS51123 a Step-Down Controller that provides the VREG output.

you can see a DOT on the chip.
start anti-clockwise and measure the value with adapter on.
BEWARE! of the probes. Slow and don`t move the probes

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

that 51123 its actually TPS51123 a Step-Down Controller that provides the VREG output.

you can see a DOT on the chip.
start anti-clockwise and measure the value with adapter on.
BEWARE! of the probes. Slow and don`t move the probes

Thanks so much for the reply. Gonna do that after finish work. Thanks again.

One more thing, does it safe if the chip is getting hot?

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

One more question, is it possible to replace the chip, or does the chip is ok and the culprit is other caps?

I'm a noob, I confess first. Any guides is appreciated.

Thanks.

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

Does this have to with anything?...

https://cdn.badcaps-static.com/pdfs/...294292b2b0.pdf

http://www.ti.com/product/tps51123

[dj_ricoh]

Re: Toshiba Satellite C640 No Power Need Help

that's the one!
find the V for each pin

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

that's the one!
find the V for each pin

OK BOSS!!!

My multimeter probe quite thick. Is it dangerous if I accidentally short between the pins?

[lorins_core]

Re: Toshiba Satellite C640 No Power Need Help

I have Encounter before. check the caps around at Ic. may be Have Little Short or Leak...

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

I have Encounter before. check the caps around at Ic. may be Have Little Short or Leak...

Thanks. If you have some pics it will help me a lot. Thanks again for the advice.

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

This guy do the tps51123 replacement seems so easy!!!!

https://www.youtube.com/watch?v=kRbB4ufRpN8

[dj_ricoh]

Re: Toshiba Satellite C640 No Power Need Help

I film one to but i did not manage to edit and upload it.
Its easy. Last one it took me 5 min and 15 to assamble the notebook back.

[alihomee]

Re: Toshiba Satellite C640 No Power Need Help

check for any short around that ic if doest found any short then replace it with same part num

[trebo]

Re: Toshiba Satellite C640 No Power Need Help

I film one to but i did not manage to edit and upload it.
Its easy. Last one it took me 5 min and 15 to assamble the notebook back.

can you tell us what temperature you set your station to remove and replace that chip
thanks in advance

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

check for any short around that ic if doest found any short then replace it with same part num

Will do that, bought a new multimeter. My last one busted.

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

that's the one!
find the V for each pin

Pending reading...

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

OK, here's the reading from pin 1 to pin 24 counter clockwise starting from the mark.

Pin1 (TRIP1) - 0 V
Pin2 (VFB1) - 0 V
Pin3 (VREF) - 1.99 V
Pin4 (TONSEL) - 3.32 V
Pin5 (VFB2) - 0 V
Pin6 (TRIP2) - 0 V

Pin7 (VO2) - 0 V
Pin8 (VREG3) - 3.32 V
Pin9 (VBST2) - 1.38 V
Pin10 (DRVH2) - 0 V
Pin11 (LL2) - 0 V
Pin12 (DRVL2) - 0 V

Pin13 (EN0) - 1.76 V
Pin14 (SKIPSEL) - 0 V
Pin15 (GND) - 0 V
Pin16 (VIN) - 19.38 V
Pin17 (VREG5) - 1.67 V
Pin18 (ENC) - 0 V

Pin19 (DRVL1) - 0 V
Pin20 (LL1) - 0 V
Pin21 (DRVH1) - 0 V
Pin22 (VBST1) - 1.44 V
Pin23 (PGOOD) - 0 V
Pin24 (VO1) - 0 V


So, any defects on the VReg?

[dj_ricoh]

Re: Toshiba Satellite C640 No Power Need Help

vreg3 stand for 3.3v output. yes?
your first its ok vreg3 3.32 but
vreg5 needs tot be 5v not 1.67v

[dj_ricoh]

Re: Toshiba Satellite C640 No Power Need Help

find other chip like this maybe you can find the charging chip!
isl maxim? whe need to find if that's ok!

do you have another way to charge your battery?
that will help a lot. to see if it powers up on battery.
oohh and my latest discovery unplug the bios battery discharge the board and plug the adapter. see if something happens

[dj_ricoh]

Re: Toshiba Satellite C640 No Power Need Help

If someone got a schematic for this board please attach it here.
so dam hard to find

[tiubxray]

Re: Toshiba Satellite C640 No Power Need Help

vreg3 stand for 3.3v output. yes?
your first its ok vreg3 3.32 but
vreg5 needs tot be 5v not 1.67v

It is like my multimeter display it. I do this check 5 times to make sure there is no mistake.

find other chip like this maybe you can find the charging chip!
isl maxim? whe need to find if that's ok!

do you have another way to charge your battery?
that will help a lot. to see if it powers up on battery.
oohh and my latest discovery unplug the bios battery discharge the board and plug the adapter. see if something happens

Done that already, nothing happen. Just the chip is getting hotter if I plug in the adapter.

Thanks for your help. I really appreciate it.