Sony MBX 247 Laptop Dead. Need help ( Pics attached )

[Techtiger]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

After replacing the cap bios chip PIN 8 any voltage change & power button any change?

[Techtiger]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

resistance in PL13 ? PL13 +3VPCU present ? PD26 PIN 2 15V ?

[on/off]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Which component could be resposonsible for the volrage drop ?
When I mount the PD27 then I get around 7.5 volt on pin 3 and then i mount PD28 then I get 9.9 volt on Pin 3.

Also is the gate voltage on PQ59 correct ?

Resistance on PC61?

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

resistance in PL13 ? PL13 +3VPCU present ? PD26 PIN 2 15V ?

Resistance on PL13 is around 180 ohms.
PL13 +3VPCU is present

PD26 has no voltage on PIN2

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Since there is no Voltage in BAT+ . I have measured the voltages on the charging IC chip and they are as follows

PU10 ( ISL88731CHRTZ )


Pin 2 - 3.54 ( ACIN)
Pin 3 - 3.16 ( VREF)
Pin 4 - 0 Volt (ICOMP)
Pin 6 - 0Volt (VCOMP)
Pin 8 - 0 Volt (ICM)
Pin 9 - 3.36 ( SDA)
Pin 10 - 3.36 (SCL )
Pin 11 - 3.34 (VDDSMB)
Pin 13- 3.93 ( ACOK)
Pin 15 - 0 Volt (VFB)
Pin 17 - 0 volt
Pin 18- 0 Volt
Pin 20 - 0 volt
Pin 21 - 5.05
Pin 22 - 18.95
Pin 23 - 0 Volt
Pin 24 - 0 Volt
Pin 25 - 4.95
Pin 26 - 5.05
Pin 27 - 19.38
Pin 28 - 19.38



Is this IC faulty ? Please help.

[dj_ricoh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Now measure the Resistance on the same chip.

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

now measure the resistance on the same chip.

2- 640
3- 1000
4- 1005
6- 1020
8 - 917
9- 633
10- 645
11- 178
13- 667
15- 281
16- 280
17-180
18- 186
20- 545
21- 560
22- 825
23-176
24- 770
25- 750
26- 557
27- 622
28- 621

[on/off]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Resistance on PL13 is around 180 ohms.
PL13 +3VPCU is present

PD26 has no voltage on PIN2

I think @techtiger was typo, what he means of course PD28 pin2

What about the resistance on PD28 pin2?

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

I think @techtiger was typo, what he means of course PD28 pin2

What about the resistance on PD28 pin2?

Thanks for your response . Resistance on PD28 is around 1.8K Ohms
Resistance on PD27 Pin 1 is 170 ohms.

[on/off]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

My expextation should be 200K or more on PD28 pin2, ( maybe your lead probe black on point and red probe on gnd, right)

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

My expextation should be 200K or more on PD28 pin2, ( maybe your lead probe black on point and red probe on gnd, right)

Yes red on ground and black on the test point. Multimeter set at 2K ohms range.

How exactly is the 15V generated . Does this diode internally increase the voltage from 5V to 15V ?

Update : If I set the multimeter range at 20K then I get 5.99 resistance on PD28 Pin 2.

[on/off]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Seem fine if ~500K.

What voltages on PQ65 and PQ44?

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Seem fine if ~500K.

What voltages on PQ65 and PQ44?

PQ65
Pin 3 - 4.85 Volt
Pin 2 - 0 Volt
Pin 1 - Ground

PQ44

Pin 3 - 4.9 and rest all pins have 3.3 volt.

[on/off]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Now, measure the resistance on PD27 pin2

[on/off]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Yes red on ground and black on the test point. Multimeter set at 2K ohms range.

How exactly is the 15V generated . Does this diode internally increase the voltage from 5V to 15V ?

Update : If I set the multimeter range at 20K then I get 5.99 resistance on PD28 Pin 2.

Here: on Page 35

https://cdn.badcaps-static.com/pdfs/...ed6b68ec05.pdf

I think because drop 15V be 10V, the problem had effect to MAIND signal, didn't generated 5V_S5 be 5V and so on.

EDIT: should be page 36

[dj_ricoh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

I small Q did you reflash the bios or test to see if the chip it's ok?

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

I small Q did you reflash the bios or test to see if the chip it's ok?

I did flash it with one the bin file found on the internet. Should I revert back to the original one where atleast I could the LED glowing ?

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Here: on Page 35

https://cdn.badcaps-static.com/pdfs/...ed6b68ec05.pdf

I think because drop 15V be 10V, the problem had effect to MAIND signal, didn't generated 5V_S5 be 5V and so on.

EDIT: should be page 36

Should I change the pm6686 IC ? Or maybe the replaced diode itself could be faulty again ?

[IamPritesh]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

I small Q did you reflash the bios or test to see if the chip it's ok?

I reflashed the bios chip with the original file , it still does not start. But I do have 3.3 volt on Pin 8. Earlier it was only 1 volt.

[on/off]

Re: Sony MBX 247 Laptop Dead. Need help ( Pics attached )

Should I change the pm6686 IC ? Or maybe the replaced diode itself could be faulty again ?

No. I think PM6686 is fine. You didn't answer my question about resitance PD27 on pin2.