Dell 3521| No power | 3V_5V IC short | PCH_PWR_EN absent |

[@Arturochirinoscruz]

Excelente video, gracias y saludos desde Perú 🇵🇪

[@JFIXX1]

Very nice repair and good solution better than replacing the EC chip and programming chip. I have subscribed

[@rosetaylor-nl1ol]

Nice, thanks for sharing. God bless you.

[@philiptroniks]

@@rosetaylor-nl1ol Welcome and thanks

[@rosetaylor-nl1ol]

@@philiptroniks I'm looking for mentorship in this field. Are you available?

[@philiptroniks]

@@rosetaylor-nl1ol I'll try my best to educate you through the case studies that I attempt from repairs. I will share important matters about diagnosis in future. Stay tuned !

[@KOOS-EDTSOF]

exelente gracias

[@philiptroniks]

@@KOOS-EDTSOF Thanks

[@darattaqwa]

Nice video thank you, what would happen if you short the pins on the sio when taking readings, can chip be damaged?

[@philiptroniks]

​@@darattaqwa Great question. Mostly SIO handles signals from various components in and out of the chip. The voltage on these signals has very less amount of current like 100-350micro amps. Shorting these pins will not short the chip. Anyhow avoid shorting the supply pins with other signal pins in the SIO, because in some motherboard SIO is supplied with the inductor voltage 3.3v which is basically having above 5amps. Shorting this line with other signal pins will short the chip. Anyhow for saftey purpose use magnifier or microscope for checking. And also use sharp needle probes for your multimeter.

[@darattaqwa]

@@philiptroniks thank you so much for the detailed explanation, you are a great teacher and I’ve added a lot of your videos in my playlist to watch later, I’ve liked and subscribed, keep up the good work

[@jeewanthawanninayaka7607]

Thanks for sharing. I also faced the same problem but in my circuit, pin number 26 is not shorted. Can you tell me what are the basic requirements for the PCH_PWR_EN signal to be out from pin number 26 of SIO chip?

[@akcoord9615]

could you plz in full video explain power cycle and boot stage sequence in modern and old motherboards in detail with scemaics thanks

[@philiptroniks]

@@akcoord9615 Sure, in future videos

[@LIONJCOMPUTERSOLUTIONS]

Please checking impedance from current sensing resistor to coils means what

[@philiptroniks]

@@LIONJCOMPUTERSOLUTIONS Impedence means resistence + reactance ( inductors and capacitors). With diode multimeter you can check the impedence value from CSR to Coil and from coils to ground

[@LAPTXINFOTRONICS]

Hi sir . What happened with the second IC you changed ? Is it dammaged or somthing ??

[@philiptroniks]

I have only replaced 5v/3v IC once, at 1st I did reflow the same IC and that did not work the problem was with the IC, then I replaced brand new one. Then I got both 3v and 5v.