processor and chip core video test points

[rx123]

Hi friends

I don't know if there is already a topic about it

but I want to know how to measure with your test points

How to measure them, when they are in bad condition when they are short

with multimeter

some help?

Thank you

[dicky96]

Re: processor and chip core video test points

Yes you can check either the voltages or the resistance on the capacitors here.

Typically for a Northbridge /PCH you will have three different voltage rails, one or two will be present in standby before you press the PS_ON switch

On a GPU there are usually three or four. Again one of these is a standby or startup supply typically 3.3V. The others will usually be GPU core (around 1V, often very low resistance <1 ohm), GPU+RAM supply again around 1V-1.1V and typically 100 ohms, and sometime another supply rail with high resistance. I'm not sure what this one is, possibly a bias or Reference voltage.

Here is a real life repair where I found the fault on an MSI Gaming Edge motherboard using this method by checking from the PCH capacitors

https://www.youtube.com/watch?v=Ej_1VIOkQiQ&t=1355s

Here is another one where I measure the GPU resistances on a good graphics working card
https://www.youtube.com/watch?v=Pc3E4oR_o_Q&t=435s

Also if you look on my YT channel you will see series of several videos regarding 8800GT graphics cards where I also look at GPU resistances, voltages, and short circuit tracing

I hope that helps.
Rich.