Dell E7470 motherboard repair, a hard one - Part 1 

3 years have past now since this vid was released. I believe most dell repairmen would know by now, that this chip CD3301B is not generating 3.3v . This so called "power management" chip is simply controlling key power Mosfets on the motherboard. It is actually quiet easy to bypass this chip and remove it completely from the MB. The main power rail on this MB is +13.5 volts, when AC is in use and +8V or so when on battery. But since chip was getting hot it was the right decision to replace it anyway. Thanks for the great vid Sorin!

33:12 schematic from polish forum Elvikom ;) Greetings from Poland. Ive found your channel when I had same problem with no backlight in Lenovo laptop after changing screen. Keep up the good work!

Sorin you teach the best, I broke my laptop and while I couldn't fix it myself I have learned so much and I will continue to learn until I master the basics

Seems like I have the same fault for a a latitude D830 (iGPU). But unlike you, I am extremely lucky because when handling the board I realised putting my finger in one of the spots make it work perfectly and releasing shuts it down immediately. So my solution was to solder a 200KOhm resistor at that place (the resistance of my skin over that length) and it works just fine lol and it's only now I think it's the same problem as this

Hey dude, I love the way you keep things simple, uncomplicated and in a language that can be understood. Computer Technicians time is expensive, and rightly so...when I blew my board, I found the cheapest option was to swap it out for a refurb..an option that should be considered by those in a similar place. Respect my Man, Peace

Well that's a bit discouraging, there is no solid knowledge of electronics in an industry that evolves everyday. Every engineer comes with something new. I am glad that i found this channel, keep up the good work. Si ma bucur ca sunteti Roman de al meu si faceti treaba buna. Toate cele bune!

A PL is not a carbon resistor, at high frequencies a carbon resistor will have a significant parasitic inductive component but it will not behave properly when dealing with high power due to the resistive losses that this the CR would have (also capacitive parasitic components). PLs(power inductors) could be used in for example DC-DC converters, where efficiency is key as they have low ESR.

I think the parts marked PL you speak of, that look like resistors, are in fact just ferrite filters used to stop high frequency noise getting from each power supply back into the main 19v rail.

PL = Power Imductor. L is a sign of an inductor(coil).

You are the best serwisant on youtube

Thank you very much master for showing the reality of reparations. Greetings from his disciple from Argentina.

CD3301B controls if the power comes from the doc connector or the dc in plug, time 35:00

Great job on the videos and thanks for posting them!

oops missed this one, never missed any vid yet

Thank you very much, I like your approach so much, and definitely learnt a lot from you. Please continue the repair project with your style.

Videos are Best on the Internet...

I know sorin doesn't needs any one's suggestion but downloading schematic saves plenty of time...

Omg. Part 1. thas mean its very hard one :D But Sorin fix it 100% Stay tune foks for other parts. Sorry my bad eng

I watch ya few times on tube I have tried fix 5 so far laptops the alienware one I'm on oh gosh mess hair dust clean clean and then vac6 breaks dang oh well keep going thank you for info

Amazing what you are doing with your knowledge and experience. Whiteout a schematic of the board finding the problem of the 3.3v power rail. Thank you for the great work and i watch the next video 👍🏻. I did watch the video again and again don’t understand why you find the 3.3v it’s not a normal laptop and I don’t have experience with the broken chip.what is it doing?

Thanks for all knowledge that you give..

Amps and petrol 😎

Sorin Come to Besiktas and Thnx for video...and teach us to how to make needle probs... :D

Would using a Thermal Camera to look at motherboards be a time saver, one could possibly see where it may be getting abnormally hot from the start & point someone in a direction to investigate? Have you ever tried it, would it be good idea and good tool to own for diagnostics?

Need Help from motherboard experts. My Dell e7470 was damged from dock area. All motherboard is working fine and laptop is booting but the dock area gets very hot and spark. I don't want to dock in my laptop. Is there any way that i can disconnect the dock area from power. The dock area is a separated slice in motherboard.

Please I need Help with my Dell E7240 .When the power is plugged in the CPU is getting very hot .With power on ,no fan no display and pwr led goes off after approximately 20s.Thnks

please help me,i have a laptop latitude E6420 it start up suddenly shutdown in 2 or 3 seconds and also charging is on and off..

Were Back...

Hello and thanks for all your videos. In this video, you didn't unplug the battery to test a frozen i/o chip. why ? whats symptoms did its not necessary?

Dell laptops have two Super IO chips one it the main chip the other chip its called a Super IO extender.

You are great

HI i have a Dell Latitude E7270 it won't when i press the power button to tune it on i keep on getting flashing on my keyboard and will not turn on can you please tell me what the problem is so i can try fixing it please

Hi. Are you using WERA screwdrivers? It looks like WERA.If so whats your opinion about those screwdrivers?

Sir make a vedio on how to make AV in to VGA out or HDMI in to VGA out cable

Thanks Sorin, What means the plus it´s going here? Can you show us what pin was? and why ? thanks man.

Hi, please help i have a problem with dell 7450, when i put power button, led power light up for 20s but nothing happen , no screen , and then led power off, only led battery change is light up, how can i fix it

Wo sitzt bei einem Medion md41300 die sicherungsbatterie

dell 7470 internal dislay not working

yahoo a 50 min video

CD3301 voltage regulator

sir i have acer zg5 netbook no power good adapter hope you have atroubleshoot about that thanks

lovely sir.

please help me with my laptop it's an HP model 250 G3 laptop it is working well but after some time while am working the screen goes off itself and the lapttop still working and when i connect external screen i found it is still working do i have to change screen or it's a motherboard problem

How I send a laptop to you for repair?

How come, that you never get severely water damaged laptops? One would think, that people always pour something into their laptops. Is it that rare?

Hallo habe einen Laptop Medion md41300 der wird heiß und schaltet ab

Hello..why my ASUS aspire s7 cannot on

The Best!!!!

let me guess CD3301B or CD3301A ,time stamp 20:00

Please let us know how do you identify chips and their functions on the board?

Proper hard

Are you using zippo lighter fluid?

Can you hire me in your service?

Needs another stick of ram - another stupid embedded CPU

I cant understand one thing: why today's notebooks steel need 19V? Нафига? Это же даже не стандартное напряжение. Было бы for example 24V, that I possibly could understand...

I will not be buying the Dell brand if they keep designing their laptops like this. I have never seen a motherboard so hard to access.

👍👍👍👍👍👍👍

latitude motherboard are shit. i bought onev7 month and dead laptop.

Are people stupid, if you wanted to advertise for buisness then why do you try to help people and teach them how to repair things, that makes no sense. Nobody who wants more buisness will show people how to try and do it themselves.... :/

you need someone to edit your videos its too long and parts of it you just doing nothing