Vaio VPCSB2M9E/PCG-41218M dead after drop

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

I'm having a really hard time reading it, but it seems to say BQ725 only.

Thanks.

[atsio]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Give readings of volts on all pins of BQ725.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Couple things I should say before..
It's really hard measuring all pins isolated, maybe my multimeter tips are too big.. That say, might be some discrepancies in readings but I did my best.
Another odd thing I should mention is pins 1, 2 and 3 initially read 19V but it went to 0V for a couple of minutes, and then came back to 19V..

1-19V
2-19V
3-19v
4-24V
5-0V
6-2.6V
7-1.4V
8-1.5V
9-0V
10-0V
11-1.6V
12-1V
13-1V
14-0V
15-0V
16-6V
17-5.6V
18-1V
19-1V
20-19V

Thanks.

[atsio]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Pin 5 should be high, although all conditions are met it is not. Try with a charged battery, and check if laptop powers up. If not, measure charger voltage on all pins again.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Hey,

I had already tried to power on battery, but nothing.
Yesterday I also forgot to mention, these measurements were with board disconnected from main board. Do you want measurements with battery and mainboard connected, or with battery only is enough?

Thanks.

[atsio]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Hey,

I had already tried to power on battery, but nothing.
Yesterday I also forgot to mention, these measurements were with board disconnected from main board. Do you want measurements with battery and mainboard connected, or with battery only is enough?

Thanks.

Pin 5 is going High when power supply adapter is detected allowing 19v to the system. You should have 19V on two NPN fets near charger on source and drain pins and 24 volt on gate pins. If it is possible give the markings on those fets. Also 19v at the six pin connector to mainboard . Forgot to mention to retest for voltage on pin 5 with power suypply connected.
Read the voltages on charger pins with just the battery connected to check if charger is working.
I do not see any signals that may be needed from the mainboard for the charger to function properly, so do not connect the mainboard.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Battery connected, I still get 0V on pin 5. If I guessed right the NPN fets you mentioned are the ones marked green. All pins read 0V!

I've been searching like crazy for this board schematics but I can't find them anywhere.. I googled V030_MP_Docking_DB, CNX-458, nothing!
guruji from this forum claims to have the schematics but he hasn't shared them with anyone..

Hello,
I have the same problem what i understand they have 2 supply dcbatout and the other is vcc charger r for main mosfet to supply the mosfets i have not started with the laptop repair in full swing but will get my hands on it does anyone want the dockin schem ill email it thanks

Thanks.

[atsio]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Battery connected, I still get 0V on pin 5. If I guessed right the NPN fets you mentioned are the ones marked green. All pins read 0V!



Thanks.

Pin 5 should be high only when adapter present. Pin 11 should be 6v (roughly) above the voltage on pin 12 when laptop works with battery. I need to see voltages on all pins of charger with only battery connected to determine if charger is working.
Which picture of the fets marked in green are you referring to?
Have you checked on the connector to mainboard if you have 19V?
I'll try to get the schematic for you. I do not like to ask for many favours because I might need them for me sometimes.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Sorry, forgot to upload photo.

Pin 5 reads 0V with/without adapter/battery present.
Pin 11/12 reads 0.2~1.5V, with/without adapter/battery present.

I see 19V on several pins to main board with adapter connected, but on battery all read 0V.

I'll do a quick read of all pins and post right back.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

With battery connected, pin voltages match. I did noticed pins 1,2,3 go from 19V to 0V a lot, maybe caused by shorting pins while reading..

1-19V
2-19V
3-19v
4-24V
5-0V
6-2.6V
7-1.4V
8-1.5V
9-0V
10-0V
11-1.6V
12-1V
13-1V
14-0V
15-0V
16-6V
17-5.6V
18-1V
19-1V
20-19V

Thanks.

[atsio]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

I forgot to ask (now that you have a regulated power supply) what are the amps drawn from laptop when you plug the adapter?

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Unfortunately my regulated power supply isn't as stable as I'd wish.. But I'm guessing it's current isn't higher that my 5A adapter. 19V supply are steady and neither adapter or laptop shut down 19V supply.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Ok, my regulated power supply was supplying 0.06A with 19.5V disconnected from main board with battery connected. Same with main board connected.
As I guessed it's not draining too much current, which also means it's not charging battery.

[atsio]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Ok, my regulated power supply was supplying 0.06A with 19.5V disconnected from main board with battery connected. Same with main board connected.
As I guessed it's not draining too much current, which also means it's not charging battery.

You measure the current drawn from regulated power supply without pressing power button and without battery.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Without battery, same thing.

Regarding power button.. All these test are being made without 3rd logic board that connects to power button (see pic) and is attached to palm rest.

When I want to test power button I always put all boards back in place and connect all cables.

Thanks.

[atsio]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Sorry for not answering earlier but I was too busy today. I think you should change your charger.

I am atouching the schematic you are looking for

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Wow man! Thank you so much for the schematics!! Awesome!

I was getting myself prepared for replacing the charger. I have a BQ25A which according to aliexpress website is compatible.. Can I use BQ25A?
http://www.aliexpress.com/store/prod...550803482.html

Thanks.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Hi,

I'm having a hard time soldering BQ25A in perfect alignment. Pins 19 and 20 keep shorting with each other, already took it out and placed it 4 times.

Any tips?

Thanks.

[Learn2Day]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

I'm having short circuits in the red dots.

I'm starting to be afraid I'm ruining the board all together..

[orientalsniper]

Re: Vaio VPCSB2M9E/PCG-41218M dead after drop

Before you did all of this, did you check if pin1 of CN5 in power board had 19V? In my case I solved one by replacing the fuse in the powerboard near CN5.