Very nice explanation, you have a new subscriber. If I may make a few suggestions ... You say at 3:04 that if 3vldo is missing, but B+ is present then the IC should be replaced. Before that, one should remove power and check resistance to ground on the 3vldo pin. If there is no short, then the IC should be replaced. If there is a short, then that should be investigated (and yes, this ic would be a prime suspect for that as well). You did mention checking for short on the 3valw line if that voltage is missing while the B+, EN and 3vldo are present. This is usually sufficient, but if there is no short, it's good to check for 3valw voltage again while holding down the power button, as some manufacturers configure this switched voltage to only be present after power button press. Intel's DeepSx sleep states also allow various configurations to be used. So holding power button while checking, is a good way to confirm it is indeed missing. Thank you, and please keep up the great work
Thanks for great explanation! When i check my ldo3 it goes up to like 1.7v then ic chip gets hot and turns itself off. At the same time i also check ec chip's +3vlp input and its same as 1.7v as ldo3 output. So my guess i have a short on my +3vlp rail! Am i right? Any help appreciated thanks
Comparing this part, that is used to create 3val , to the pm chip that charges battery, I still don't see the need why there is the LDO 3v pin . Is it important because they are more stable with varying and lower voltages? Anything else? Oh I've just read they don't work like switching buck boost regulator so are noise healthy choice.
Very nice video my friend . I have a little question tho.If i have a situation on a intel 5th Gen Lenovo Labtop.I have 19v present . I also have 3v/5v always present.But when i press the power button i get power LED for a split second and motherboard does not start up fully. On bench power supply the same time i press power button the amps go from 60 milliamps to 100 milliamps then back down to 60 milliamps.if i press the power button again it does the same thing sequence mentioned above.Can i conclude that there is a problem with the Super IO or KBC ?
Hello friend As long as the Super IO does respond to Power button we can say it isn't faulty. Try reprogramming the Bios and check for shorts at other power rails like the 1.8v,1.5v ,0.9v VCCSA and 0.9v VCore
This PDF book might help you brother www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwi1-8a9-MH6AhX5h_0HHQEPDa4QFnoECAUQAQ&url=https%3A%2F%2Fcontent.instructables.com%2FORIG%2FFH3%2FDM1V%2FHRTWJLSB%2FFH3DM1VHRTWJLSB.pdf&usg=AOvVaw0vMA89OAUSDYgvRQGCRMS_
The 3v3 ldo is mostly used by the SIO ic.. any short in this rail is highly to be a bad SIO or the reg itself. Yes you can injct voltage there and see what gets hot..
how to tests if LDO is fail, vrm mosfet in phase 7 connect to LDO regulator IC always blow but if test voltage all is ok, or gpu is fried? please help me
Very nice explanation, you have a new subscriber. If I may make a few suggestions ... You say at 3:04 that if 3vldo is missing, but B+ is present then the IC should be replaced. Before that, one should remove power and check resistance to ground on the 3vldo pin. If there is no short, then the IC should be replaced. If there is a short, then that should be investigated (and yes, this ic would be a prime suspect for that as well). You did mention checking for short on the 3valw line if that voltage is missing while the B+, EN and 3vldo are present. This is usually sufficient, but if there is no short, it's good to check for 3valw voltage again while holding down the power button, as some manufacturers configure this switched voltage to only be present after power button press. Intel's DeepSx sleep states also allow various configurations to be used. So holding power button while checking, is a good way to confirm it is indeed missing. Thank you, and please keep up the great work
Thank you for this great and valuable information
I really appreciate it
Excelente 👏 👏👏👏video, muy importante es saber como trabaja un LDO en la placa madre. Gracias máster, saludos desde PERÚ 🇵🇪.
You are welcome brother
nice one sir .... pls explane 3v 5v dual supply genarated ic
I will make sure to make a video about it 👍
Sir when will you do video explaining 3v 5v dual supply generated ic
I am waiting for that one too
thank you very simple and excellent explanation , i recommended for any one in the field .
Can you please tell me what is the meaning of the LDO acronym ?
Low Drop-out
Very clear I will subscribe
Thank you so much
very helpful
Thanks brother
Encore une très bonne explication, merci pour votre dévouement.
tu es le bienvenu cher ami
Nice my friend
thank you so much for your video i learn a lot :)
Welcome brother
Very good lessons...👍
Thanks for great explanation!
When i check my ldo3 it goes up to like 1.7v then ic chip gets hot and turns itself off. At the same time i also check ec chip's +3vlp input and its same as 1.7v as ldo3 output. So my guess i have a short on my +3vlp rail! Am i right? Any help appreciated thanks
gorgeous
Thanks
Great explanation.
fantastic
thank for you
its very clear
U R welcome brother
Very nice explanation, you have a new subscriber.
Thank you so much
I really appreciate it
thank you
Hi there , please make a tutorial video about what is power rail om laptop mainboard . thnx
Comparing this part, that is used to create 3val , to the pm chip that charges battery, I still don't see the need why there is the LDO 3v pin . Is it important because they are more stable with varying and lower voltages? Anything else? Oh I've just read they don't work like switching buck boost regulator so are noise healthy choice.
What is the boot strap.. can u possibly do a version were u explaining each pin and its functions
Nice explanation
Great content
Brother beautifully said ❤️💜
😊⚘
Pls can you do video on 5v LDO tks
شرح رائع واصل
Very nice video my friend . I have a little question tho.If i have a situation on a intel 5th Gen Lenovo Labtop.I have 19v present . I also have 3v/5v always present.But when i press the power button i get power LED for a split second and motherboard does not start up fully. On bench power supply the same time i press power button the amps go from 60 milliamps to 100 milliamps then back down to 60 milliamps.if i press the power button again it does the same thing sequence mentioned above.Can i conclude that there is a problem with the Super IO or KBC ?
Hello friend
As long as the Super IO does respond to Power button we can say it isn't faulty.
Try reprogramming the Bios and check for shorts at other power rails like the 1.8v,1.5v ,0.9v VCCSA and 0.9v VCore
Thank you br
Are all the 3.3V LDOs interchangeable? Same question for 5V LDOs?
Any repairs books
Unfortunately I don't have any repair books
I just learn by my self
Thanks for sharing this video, may i ask as mentioned how can we get the IC coding details engraved on it
This PDF book might help you brother
www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwi1-8a9-MH6AhX5h_0HHQEPDa4QFnoECAUQAQ&url=https%3A%2F%2Fcontent.instructables.com%2FORIG%2FFH3%2FDM1V%2FHRTWJLSB%2FFH3DM1VHRTWJLSB.pdf&usg=AOvVaw0vMA89OAUSDYgvRQGCRMS_
Hi Teacher. How to injector voltage on the ldo ic to check it I have a short on cap by ldo pin
The 3v3 ldo is mostly used by the SIO ic.. any short in this rail is highly to be a bad SIO or the reg itself.
Yes you can injct voltage there and see what gets hot..
thank you for your effort, this LDO in my hp laptop is overheating whats thats mean, (dead laptop), have i change it or what can i do, thank you
LDO is a linear regulator, so if it heats up then you might have a short at the output side.
Clear the short then the LDO ic will not heat up
+3valwp drop 0.72v. I have change new IC also same. Any suggestions Sir?
Inject voltage at the +3vlawp and see if anything gets hot
And not even once you have pronounced what is the meaning of the LDO acronym.
Does it means "Limited Duty Officer" or " light diesel oil" ?
Its Low Drop-out regulator
At 0.19s
how to tests if LDO is fail, vrm mosfet in phase 7 connect to LDO regulator IC always blow but if test voltage all is ok, or gpu is fried? please help me
LDO is a linear regulator, so if it heats up or blows then you may have a short circuit at the output side
🎖️️🎖️️🎖️️🎖️️
How to get datasheet of this ic,l couldn't fine it online
Its here 👇🏻
datasheetspdf.com/mobile/1493388/Silergy/SY8208AQNC/1
Nice explanation