TSP 51125 fail to give 5.0voltage

[Zengo]

Mother board :
6050A2170401-MB-A03
Error :
Dead no power LED ,no HHD spinning or any POST
Troubleshooted
Charger IC (BQ24721C)is ok giving out 10.9v with battery and 14.6Vwith
Adaptor charger
Obsevation:
I obseved 10.9 along TSP5117 but Missing 5V to power TSP 5117,ADP 3208 and other 5v

Please give me hand on this , I need to power on this Machine
Thanks in advance

[selldoor]

Re: TSP 51125 fail to give 5.0voltage

What laptop is it out of - please put that in the thread title

[Zengo]

Re: TSP 51125 fail to give 5.0voltage

Toshiba Satellite L300

[selldoor]

Re: TSP 51125 fail to give 5.0voltage

here is a link to the schematic
http://lqv77.com/download/652/

[Zengo]

Re: TSP 51125 fail to give 5.0voltage

thanks Selldoor
I got the LINK
What i have on TPS 51125 is only 3.3 voltage which is good
but on pin 20 and pin21 0Voltage instead of 5 voltage
where is the problem?

[Zengo]

Re: TSP 51125 fail to give 5.0voltage

thanks for all , now i will be going out till tomorrow

[ledro]

Re: TSP 51125 fail to give 5.0voltage

i have the same situation with Toshiba A300. no 5v on TSP51125, only 3.3v
i replaced TSP51125 and still not working
where is the problem?
thanks.

[spleenharvester]

Re: TSP 51125 fail to give 5.0voltage

If you'd like me to take any readings from a working L300 GL960 board, feel free to ask. Just as long as they're not risky (i.e individual pins on QFN chips that aren't connected to nearby components)

[spidey]

Re: TSP 51125 fail to give 5.0voltage

i'm having the same situation here, i have 3.3v but no 5v. TPS51125, satelite c665. Still working on it, if i solve i'll let you know. But if you allready solved the problem please answer the post..

[spidey]

Re: TSP 51125 fail to give 5.0voltage

I checked datasheet of tps51125. To enable outputs, pin 1 and 6 should be connected to ground by 130k resistors. In my case, EC is driving these pins through a swithcing circuit. I disconnected a transistor, it is working now. But that means i have a faulty EC.

[h3roe]

Re: TSP 51125 fail to give 5.0voltage

What is EC ? how to handle ec

[Agent24]

Re: TSP 51125 fail to give 5.0voltage

EC is the embedded controller

[rookieme]

Re: TSP 51125 fail to give 5.0voltage

Same issue with toshiba A300, I don't get the 5V at L22.
Replaced U27 with no luck.
System powers on and off soon after. Already replaced nec tokin capacitor.
If I disconnect Q34 I get the 5V but it powers off again.
Also I replaced U29 kbc but same issue.
Schematic provided.
Any help appreciated.

[Agent24]

Re: TSP 51125 fail to give 5.0voltage

Checked for short on that rail?

[rookieme]

Re: TSP 51125 fail to give 5.0voltage

I get higher than 15kohm at that rail - seems normal

[saqib]

Re: TSP 51125 fail to give 5.0voltage

some times ic fault and some time 5v line having shortg in any resistncs