Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

[sebuncle]

Hi , this laptop have no light no sign of life .
when i plug it i can heard a little "tic" on the power board (cnx 458) , i thinks it's a short.
Can you help me to find the short please.
Best regards

[lefos]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Hello,

Have you checked for any open fuse on this board? Also on mainboard there are some fuses too. That tic sound might be normal. Do you have voltage on the black connectors (with the cables)? Also problem might be on the mainboard..

[sebuncle]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Hi i have check few voltage .
Can you tell me what i have to control ?
Thank you for your help
Best regards

[tata123]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

I have the same Problem with MBX-216, only the Power LED lights for 1 sek.

Do you have a solution?

KBC maybe? short on Power IC?

[sebuncle]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Hi
i have check voltage on BQ24725
is it right ?
Best regards

[tata123]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

i think the BQ24725 is for battery charge ..., the SN66... is for power 3/5v!!

[vaiorotto]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

I have same problem.
mbx-237.
I had checked cnx-458 and volts are equal to you.
Do you have same solution.
My is vaio vpcsa.

many thanks

[sebuncle]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Hi,
So i have change motherboard.
Best regards

[vaiorotto]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

OK.
then the cnx-458 works?

thanks

[sebuncle]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

i have changed cnx458 too.

[vaiorotto]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Dear Subuncle

but you had tray to change capacitor?

This you writed in another forum:
(Hi ,
problem is solved , i have solution on english forum.
The mbx 237 motherboards have problems capacitors short circuits (see photo in red) .
I replaced the three capacitors and laptop go on.
Manythanks for your help)

best regards

[sebuncle]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Hi
It's for another motherboard.
I repaire few laptop.
Best regards

[rodrigo.medina]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

My laptop sony vaio vpcsa35gb no video signal , turn on laptop only vga external. I need help.

[rodrigo.medina]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

My laptop sony vaio vpcsa35gb no video signal , turn on laptop only vga external, no backlight league.
I need help.

[suysuy00]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

I tried to change the 3 ceramic capacitors (10uF/25V) - temporally substituted with an 33uF/25V electrolytic cap - and my laptop now works!!! Many thanks for your precious informations!!!
One of the ceramic capacitors like in the picture, was in short circuit (laptop completely dead).
Best regards

[rodrigo.medina]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Good Morning, Suysuy00
I´m new on fix motherboard
How find the3 ceramic capacitors (10uF/25V) in motherboard ?

[Elninio]

Re: Vaio VPCSB1S1E (MBX 237/CNX 458) /no signal

Hello do you have a photo for the bad caps position on board?