Need clarification - testing voltages

[spleenharvester]

Hey all,

Having trouble understanding this - if you need to test a voltage rail, e.g +5VALW, do you go through every single source of a +5VALW voltage in the schematic and test it, or are they all connected in some way?

On a Toshiba C660 schematic, +5VALW and +3VALW are shown as being generated by TPS51125 in the flow chart - but later on in the schematic they also seem to be generated from TPS51117?

Cheers!

[lord]

Re: Need clarification - testing voltages

They should be connected.
The TPS51117 generate output voltage from pins 3 and 12. All other voltages are the IC's power supply, as shown in the datasheez.
https://cdn.badcaps-static.com/pdfs/...be3834df55.pdf

[dycc]

Re: Need clarification - testing voltages

they are all connected . tps51117 need +5valw as input to generate another voltage like 1.05v , 1.5v , 5vsus, 5vrun and so on

[spleenharvester]

Re: Need clarification - testing voltages

Ah great, thankyou!