You Can't Fix It, Because You Are Not Good Enough

[adamkevin]

a few days ago i've tried to fix a laptop battery for my mom, a dead battery and i had no success with it, because a can't reprogram de IC from de BMS, until i saw your video about BMS and battery status. Today i saw this video and it help a lot with the frustration that i had. Thanks from Brazil!

[leakim]

Let me give you another of your limitation : you have no idea how much you're inspiring me ! Thank you !

[TheOmegaman]

That chip you refer to at 6:33 minutes in is a Linear Tech Triple Monolithic Step-Down Regulator with LDO. Just search for LT 3507. There is just one chip, with different temperature specifications. It has one 2.4 Amp output and two 1.5 Amp outputs (Switching).

Pins 2, & 3; 30 & 31; 35, & 36 - +4Volts - +36Volts (this would be your +12Volt input)
Pins 37 & 38; 28 & 29; 33 & 34, are the three outputs.
Pins 10, 11, & 12 are the Power Good signals - Open Collector, active high.
Suggest you download the datasheet.


Omegaman

[reallyniceaudio]

I had a Korg DW8000 synthesiser I had on and off the bench for months, the microproessor was not running. I thought I had reached my limit after checking all power and reset lines etc. Then one day I decided to swap the crystal and after that it all came back to life. It sometimes it takes persistence to climb the tree of knowledge.

[rdson]

Being a hardware and firmware designer, who also did repair sometimes, I highly approve your point:
the complexity and raising integration into ICs saddly makes it really hard, sometimes even impossible to fix. It's kind of playing lotto... Especially without the schematics. If the issue isn't obvious, doesn't pop up any soon, you're goign to loose.
In my country - depending on the device's price of course - for the avarage you've got max 15 to 20 minutes for a full repair. If you can't succeed within that time, you lost on that one. It's a really hard, unforgiving, greedy bussiness...
Either you've access to some helpfull data or you always face the same product, gaining knowledge for the next repair (like Louis Rossmann, only fixing macbooks) so you get quicker or know what usually fails...
And when it comes to failure on ICs, especially those holding unaccessible firmware, just forget it, be sorry, next. Its sad, I don't like this, things should be more fixable, but it's the hard truth...

PS: minus isn't necessarly ground, you can also have a plus, a minus and a ground; or even more.

[yiannakosautomotivekeys]

*Excellent example here as far as knowing your limitation. As an Automotive Locksmith myself, I also fix different car electronics. Even though I started recently doing this and need more experience in removing/replacing MCUs, there are programmers which can read this micro controllers, extract their software and write them on to a new micro controller. That would have fixed the unit. The most important thing here, is to understand what does what, which you have given us a fantastic explanation. I just subscribed to your channel and I believe I will learn a lot from you sir. Thanks for your contribution to humanity, because this is what this is. Helping others. God bless!!!*

[manny]

What an absolute legend, Sorin is hands-down the teacher, the mentor, the boss, and the friend that everyone would love to have ❤❤❤

[hackwell]

That blue connector is an LVDS video connector. I work on these all the time at work. When we install Aftermarket carplay units they interupt that LVDS and inject the Carplay video image into the LCD instead of the OEM infotainment image. Check out ZZ-2 carplay, Grom or NAVTV and you will see how that signal works. BMW, Audi, and othes use this style connector. GM uses what looks like a USB but they are all LVDS. I hope this helps some.

[florentbr]

The step-down IC is a LT3507 from Linear Technology.

[currentconductors]

Great video Sorin, i have come across a few of these lately but i always keep going and end up frustrated, questioning myself. Its good to see others have issues like this too and that all boards cant be fixed!

[LagartoPT]

I feel your pain ... working without schematics or any support from the manufacturer it's a real drag.
To repair that board you would need a new microcontroler a JTAG adapter and the firmware image eventually with a reseted ID, an interesting project for a Sunday afternoon at your garage but not for a repair shop with fixed costs.
Keep up the good work, i always take a few minutes to watch your videos (when i am not dealing with the same s****).

[BuyitFixit]

Is there a clock signal? looks like possibly two xtal/oscillator positions on the board, one has capacitors but no oscillator 16:31 top left around pin 99, 100 also looks like there could be another oscillator at the right hand side around pin 47, 48 ish? I've had similar where the oscillator has failed. Worth a shot...

[mitjajan]

Hi, Sorin. Nice explanation about our limitations. We should never got trapped into the rabbit hole. The unknow IC is probably Linear Technology, and LT 3501 is indeed triple regulator. All the best and keep on doing a great job ❤

[MrRvdbeek]

Thanks Sorin,

I understand your limitation. I have more but still learning.
Most off the time from you.
This is one I learned a lot thank you for sharing

[pantsi]

Sorin is the best easy to understand teacher you can have

[paulrockwell]

he still cool teacher and watch him all every day

[Wearefree]

Salut Sorin ! Tocmai ce ți-am descoperit canalul de YouTube. M-am abonat instant pentru că sunt un entuziast al electronicii. Multă sănătate și câți mai mulți abonați!

[Basketball]

Thanks for your encouraging words...from a novice in electronics!

[hieroben]

The chip in 6:38 is a LT3507 step down converter from Linear Technology. You can get it from Aliexpress, but there are quite a few different variants around and I could not identify the exact version on your board (my limitation...).

[planker]

Well done. If I was the customer, I would be ok with this final decision. Repair or replace? Replace, an opinion presented by an electronics technician. I believe you could repair the board, however parts and labor might exceed the cost of a replacement. THIS IS VALUABLE KNOWLEDGS. Good Show.