There's an old saying.You look u see, u read u forget, But u do and u remember. This is the best video of all to date as simulation gives u that hands on working experience. Excellent video.
I learned so much from this video, and it appears you did too Sorin. That is the beauty of a good teacher, not only do your students learn, but so do you. I'd like to see you do this same lesson on a PC motherboard, as that's my thing. Great video, one for the bookmarks.
when the gopro turns off it seems like you have 4 armes Hhhhhh nice video & nice lesson .comes with a lot of skills wath need to know every beginner in that feild
Sorin : Thank You VERY MUCH ! very educational video ! [ I am that stupid guy who tried to power up a Desktop mobo with the wrong pins, No POST and CPU very hot....and checked all voltages to find out they are all OK... only to realize he used UNSUPPORTED 1st Gen C2Duo in the 775. Mobo boots fine. now to flash a latest BIOS and ..to eBay. Love this ]
I love your video friend. You are the Best teacher ever. I don't know if i am alone to feel that you love your job and teaching others. You are born to do that. You know so many things about Electronics. Congratulation friend, you are so Nice. Thank you for all your work
I watch new your videos ....but i wish to see before your videos...nowhere cant find that detailed repair videos ....I love your videos...i make better repair now thanks to you...now is 25.01.2019 i think watch your all videos...Thank you again and wait new videos from Turkey.....
Thanks, for me this is the most valuable video to date. I've learn't heaps and now I have a better diagnostic understanding to further appreciate your regular work based series.
Greatest so far as you said. Right on. Simulating is best coz you know it as you did it, and sometimes gives different result than other times. Repairing electronics is like a chess game fused with gigsaw puzzle, or trapping a mouse!
Your greatest lesson IS this video at : 19:20 forward. cant even get " them " to go over this in school was told follow the text books pfffffffffff Books
I like watching you videos. I also repair laptops mostly gaming like ROG, Alienware ect. Just fixed a Qosmio Z70-b which had a short on the GPU voltage rail. Simple fix'd by removing the inductor on that rail and forcing the laptop to use the intel 4600 built into the CPU. Well done on some of your great bypass video. Always good to see someone who can also do it without the schematics.
Soren, the bios chip has the startup chip operating rom in one side and the pc rom in the other, that is the reason why it wont turn on, no code for the startup chip :-)
Another Informative video from the Master,,. Can you also make a video about voltage injecting to find short on motherboard... looking forward for this... GODbless
Basically it's the same for "all" modern laptops (Acer, Asus, Toshiba, HP...) other than MacBooks. You have 19 V main rail and then power management chip is managing all smaller supplies and protecting them from shorts with smaller variations (basically shouldn't let you start the machine if there's a short on any rails). Macs are different with a few versions of motherboard layouts so you have to look into them separatedly.
Why not show us how to fix the charger??? I have spent many, many hours watching your videos. They are fascinating to a guy who started working on his Ham radio license at 10 in 1960 when we learned only about vacuum tubes! This new stuff is amazing!!!!
Thank you very much for your videos I have learn a lot. I have seen you short mosfet with a wire but i ve tried same but instead 19 volts gets crazy on the board especially on HPs please explain this phenomenon
Electronics repair school May I suggest to simulate a new laptop? not brandnew. bec. that one is obsolete. I learned a lot from your videos sir. thank you
Hahaha i hate that too, when they start asking for discount and saying how close friends we are. Usually i keep the story short and never accept them again
More then a year old video, but does this voltages (3.3V and 5V) also apply for desktop motherboards? On other words, does this troubleshooting applies for desktop motherboards? Great videos btw. Greetings from yours (ex) neighbor from Serbia.
It's different on a desktop computer, the power supplies are controlled by the ATX power supply, which turns them on when you short the PS_ON pin on the connector (this is what the power button on a desktop does).
Hi master, I'm one of your subscribers, I'm also an computer engineer, I solve most issues with your tutoring, I'm really glad you make this happen, I have an issue with a Samsung N102SP mini laptop, when I switch it on it on with with fan spinning but not display just like the tutorial you just made on ram power supply and have checked the ram power, I found it okay and not ram issues or displays chip, please master what else can cause this to happen, any solution for it? I will be much greatful to heed to my problem, thanks
I know how you feel, for the people that know this information, it is boring to go back to basics, but for the beginners it is actually very interesting. Thanks for the time you put into making this video.
I'm sorry. I asked about a Chromebook, but didn't mention the make is Samsung. I lost the charger. Can I use another type of charger? I only paid $260 for it. As I mentioned before, the hinge broke on left side after being to tight. Then the screen went blank. It's been 5 months since then. How will it effect the battery or other stuff? Thank you for sharing your knowledge.
Speaking of which: How about simulating this one? A BIOS corrupted during firmware upgrade. The ROM should be fine, just with a corrupt program. Can we recover from this situation without replacing the chip?
Yes you can. You just need to buy a programmer like this. m.banggood.com/da/CH341A-24-25-Series-EEPROM-Flash-BIOS-USB-Programmer-SOIC8-SOP8-Clip-Adapter-Module-p-1353168.html?gmcCountry=DK¤cy=DKK&cur_warehouse=CN&createTmp=1&ID=2363146&ad_id=328979500272&gclid=Cj0KCQjw4qvlBRDiARIsAHme6ou5434Jg-wWFSnMqpzRa1RVpGavNCY6zWKTb7iHoljSH4Sa9tgI_TAaAm9EEALw_wcB
Very useful video! Thanks! I have a Samsung np300e5a laptop and one day it just died when on. It has voltage on the BIOS chip, the green charging light is on, the blue starting light goes on when I switch on the laptop it stays on for some time and the laptop turns off. The processor ventilator doesn't go on, neither does the display. Any idea what the issue is? I'm thinking there might be a problem with the BIOS chip that probably needs re-installing. Thanks in advance! Cheers!
Great video. Like always, and yeah maybe you can fix the gopro video camera or get a better one. But anyway I appreciate that you are sharing your knowledge. Thanks
I have a laptop I think I shorted out with the display cable that runs into the motherboard I think there's a capacitor or mosfet broke. Something gets insanely hot in the middle of the board but I have to take it apart to find it
31:40 shorted 3,3v bios chip so to diagnose short you would find 3,3v power rail and put 3,3 from the power supply. in this example would bios chip get hot? and how you would identify bios chip is faulty and its needs to be replaced?
A logic probe or some good oscilloscope would probably show that, if you know what signals should be there, and if you can afford such tools (I can't). The BIOS chip is pretty much just an EEPROM with serial interface, like SPI or something alike, so it should send some zeros and ones through the data lines to the "power up chip" (which is actually a general-purpose I/O port, with a serial-to-parallel interface) when it's working properly. But I don't know how to check it with primitive tools. As for shorting the BIOS in the video, it was shorted _around_ the BIOS, so it's like it was never connected in the first place, because the current would be through the jumper wire instead of through the ROM chip. So if anything would get hot, it's the jumper wire. Unless you were talking about the actual situation in which the BIOS chip got shorted somewhere inside? That would be quite rare, because the BIOS is not really driving much current in a normal situation, so it cannot get too hot etc. And if it were damaged by some static, it would rather be insulating than shorting. More likely, the power rails can get short, through some capacitor or resistor or some other part that's under constant load during the normal operation.
I have hp pavilion notebook-AB254SA i5 laptop that turns off after 33 seconds. Checked heatsink compound and fan no problems. Removed everything from motherboard except memory and screen. Turn on with power supply and go to f2 to bios screen powers off in 33 seconds. Not sure where to look.
Really enjoyed this video, Sorin. Great idea to take a good laptop and use it to simulate issues and then fix them. Did you solve the electrical issue with your GoPro? You have a lot of patience! Guessing since your multimeter and the GoPro are both connected to the computer for vid-capture, when there's a spark, like you said, it freezes. It must be very well-built to withstand so many shocks internally. Anyways, I'll find out in your later videos if you solved it. : )
Hello sir, I'm Ajay from india.. can you make video on which are the point where we can supply dc power to find short. I'm enjoying your all videos.. thank you for information
So what happens if I do not have a 3.3V anywhere (bios, starter chip, power button, so many coils has no power but only one with a voltage moving from 4.2V to 4.8V). would now be the moment to check for a warm component with 19v on jack connector? or 3.3V from ahm... coils? coils' mosfets? anywhere lol? hehe sorry for my lack of knowledge! Have a good day!
I have watched at least 20 hours of your videos Sorin but I think this was the best I have seen so far, I hope that you will use this format at least once a week, since it was much easier for me to follow. Also and the same time and since this is a planned event instead of your usual work load you could get a basic schismatic of the areas you will cover. I hope you will not be offended and I offer only as constructive criticism, your hand drawn sketches are very difficult to see especially drawn on paper with a ball point pen. Another problem for me, sometimes there must be an open door the the foot traffic outside of the store giving a lot of background noise. I almost want to run out and buy an old Samsung like the one you use here, as then I could even learn a hell of a lot more referring to your video.Thanks again for all of the effort you take to share your knowledge and experience with us.
what Temperature on hot air station should used on Ic (chips) make a video about hot air station temperature suould be used on parts & components to solder and desolder i am learning thats why i am asking
Great video once again. Quick question that got me curious: by testing for shorts by adding current to the circuit (to understand which component is getting hot), does voltage matters? Because if i had 19V with 5Amps, when i probe the motherboard i also spark it, and destroy my probes. Since voltage goes down to almost 0V and current is driven all on it, i believe the current does the magic and voltage is no matter. What do you think about it? Thanks
Hi, can you simulate a CPU malfunction or Graphic chipset malfunction or even the PCI bridge malfunctions...I mean a CHIP level malfunction, i.e. locking down the clock just like you did for the power supplies or locking one bit of their bus... I'm trying to open a laptop service here in south italy, & don't even know if these kind of problems could arose anytime... please let me know. Thanks. Mario
MY hp monitor takes ages to warm up when coming on..like 15 to 20 minutes. i have torn the screen apart and even down to the row of light tubes a the ends of the screen..and the connections are soldered well. but still not working... i think it may be circuit board on the back of the monitor screen ..the thin strip of circuit that control the leds.. but not sure...maybe it is graphics chip on the board...i am a bit lost
How about dual N & P burn up and fix? I have a Samsung monitor which keeps burning the dual mofets on the inverter circuit and once the thermal fuse was burnt. Any idea to permanently fix the issue?
can someone answer this , i touch my DMM probe to 19v charger pin on motherboard and it sparks , just one no connection to ground . I dont understand this .
Hi Sorin. If you have any good trick to show us how to find an overloading component not shorted. which mean no short, all voltage are present but the 19.5 drop to 18.5. the laptop dead. I had sony vio shorted capacitor found on the 19v and removed. the laptop worked 1 hour and died. is any trick nothing get hot. thanks
Now when it's dead, do you still have ~19V power rail? If yes, follow it to power management chip checking voltage along the way and then from the chip to other supplies. Is 3.3 V (check on BIOS chip) and 5 V (check on USB) present? If some of them is gone look into that power supply. If something is overloading and not on short, it should get warm/hot too for disipating more power.
I tried all mention but couldnt solve the problem very hard without schematic No short on the 5 volt checked the usb couldnt find the main PS 3.3 on the bios chip and on the start button 19v volt I have Sony laptop are very hard If someone has schematic for E89382 let me know Thx
Thank you for trying to help me. Yes there is. This laptop is working differently the 3.3V is always present even if the 19V is not. When the 19V was shorted I still had 3.3V. I could not find which one is the main 5V I will try again to check if there is 3.3 on the startup chip. there is clicking noise and the voltage is dropping after the second mosfet about 1 volt. Thank you again
There's an old saying.You look u see, u read u forget, But u do and u remember. This is the best video of all to date as simulation gives u that hands on working experience. Excellent video.
Hello SORIN
You're the best Electronics teacher on TH-cam.
Thank you very much
GOD bless you
I have already repaired 2 laptops from your lessons. Thanks so much
Shorting the 5v was amazing.! ❤
This man is a big fan of the weekends for sure.
Quite possibly the most educational video you've done. Thank you so much for showing us this.
I learned so much from this video, and it appears you did too Sorin. That is the beauty of a good teacher, not only do your students learn, but so do you.
I'd like to see you do this same lesson on a PC motherboard, as that's my thing. Great video, one for the bookmarks.
An observation, when the 5volts is short the 3.3v became in 3.1v thanks for the simulation, great work!!
when the gopro turns off it seems like you have 4 armes Hhhhhh nice video & nice lesson .comes with a lot of skills wath need to know every beginner in that feild
Sorin : Thank You VERY MUCH ! very educational video !
[ I am that stupid guy who tried to power up a Desktop mobo with the wrong pins, No POST and CPU very hot....and checked all voltages to find out they are all OK... only to realize he used UNSUPPORTED 1st Gen C2Duo in the 775. Mobo boots fine. now to flash a latest BIOS and ..to eBay. Love this ]
You are the man, my beloved friend. Pursue your passion on teaching others.
I think this is the best repair video i have seen.
I love your video friend. You are the Best teacher ever. I don't know if i am alone to feel that you love your job and teaching others. You are born to do that. You know so many things about Electronics. Congratulation friend, you are so Nice. Thank you for all your work
I watch new your videos ....but i wish to see before your videos...nowhere cant find that detailed repair videos ....I love your videos...i make better repair now thanks to you...now is 25.01.2019 i think watch your all videos...Thank you again and wait new videos from Turkey.....
everone give him props he grate man tk teech like he doe,s i realy need shake his hand never no i may just walk in your shop one day ya?
Thanks, for me this is the most valuable video to date. I've learn't heaps and now I have a better diagnostic understanding to further appreciate your regular work based series.
Thanks a lot for this video. It was very instructive. I'd like very much to see another one like this with other interesting common faults
Greatest so far as you said. Right on. Simulating is best coz you know it as you did it, and sometimes gives different result than other times. Repairing electronics is like a chess game fused with gigsaw puzzle, or trapping a mouse!
Learning such a lot you are a brilliant teacher.
All in one diagnostics video. Thank you alot !!
Your greatest lesson IS this video at : 19:20 forward. cant even get " them " to go over this in school was told follow the text books pfffffffffff Books
Omg 😱you are just machine. That know every thing about it's action.... Also fabulous mentor. 👌👌
hello, i have seen many of your videos.... thanks for educating me.... grateful to you..... god bless you....
rajendra vijapurkar
I like watching you videos. I also repair laptops mostly gaming like ROG, Alienware ect. Just fixed a Qosmio Z70-b which had a short on the GPU voltage rail. Simple fix'd by removing the inductor on that rail and forcing the laptop to use the intel 4600 built into the CPU. Well done on some of your great bypass video. Always good to see someone who can also do it without the schematics.
Soren, the bios chip has the startup chip operating rom in one side and the pc rom in the other, that is the reason why it wont turn on, no code for the startup chip :-)
Thanks
Another Informative video from the Master,,. Can you also make a video about voltage injecting to find short on motherboard... looking forward for this... GODbless
Very informative tutorial, I learn new things. I want you do this again with diffirent laptop model. Thanks a lot.
Basically it's the same for "all" modern laptops (Acer, Asus, Toshiba, HP...) other than MacBooks. You have 19 V main rail and then power management chip is managing all smaller supplies and protecting them from shorts with smaller variations (basically shouldn't let you start the machine if there's a short on any rails). Macs are different with a few versions of motherboard layouts so you have to look into them separatedly.
If only they also standardized the power connectors... ;P They're all 19V, but every single plug is different ;P It drives me crazy urrghh ;P
i feel your pain sir
Why not show us how to fix the charger??? I have spent many, many hours watching your videos. They are fascinating to a guy who started working on his Ham radio license at 10 in 1960 when we learned only about vacuum tubes! This new stuff is amazing!!!!
Thank you very much for your videos I have learn a lot. I have seen you short mosfet with a wire but i ve tried same but instead 19 volts gets crazy on the board especially on HPs please explain this phenomenon
Can the 5v and 3v IC get hot when we plug the charger but is not a faulty IC? Maybe is getting hot for something else...
I gave a guy a quote to fix his car once, his reply was ouch thats high, you do side jobs at home? Ummm no this is my shop take it or leave it lol.
thenks for the lessons professor.
Very interesting, i have lot more ideas today on laptop board, Thanks boss.
Electronics repair school May I suggest to simulate a new laptop? not brandnew. bec. that one is obsolete. I learned a lot from your videos sir. thank you
Hahaha i hate that too, when they start asking for discount and saying how close friends we are. Usually i keep the story short and never accept them again
how i can find the 3,3v power rail and how i can use the external power supply to help me find sort on this?
Thank you very much!
More then a year old video, but does this voltages (3.3V and 5V) also apply for desktop motherboards? On other words, does this troubleshooting applies for desktop motherboards? Great videos btw. Greetings from yours (ex) neighbor from Serbia.
It's different on a desktop computer, the power supplies are controlled by the ATX power supply, which turns them on when you short the PS_ON pin on the connector (this is what the power button on a desktop does).
can u try put some protection to GoPro so it cant be freezed so often from those sparks?
Thank you for the good quality videos ! Mult succes in continuare :)
Hi master, I'm one of your subscribers, I'm also an computer engineer, I solve most issues with your tutoring, I'm really glad you make this happen, I have an issue with a Samsung N102SP mini laptop, when I switch it on it on with with fan spinning but not display just like the tutorial you just made on ram power supply and have checked the ram power, I found it okay and not ram issues or displays chip, please master what else can cause this to happen, any solution for it? I will be much greatful to heed to my problem, thanks
That does sound like graphic issue. Did you try reflowing the GPU? Other option is resetting the BIOS but I don't thing it's an issue here.
check the ram voltage and post here
Can you make a vid in which you'll make a teardown of that GoPro? Maybe you can help it :)
It's funny how you're always sitting at the same desk, but you usually have a different mouse in each video.
Very informative, great video. My favorite youtube channel. Thank you!
I'm liking very much that new series you're making :D
i start getting bored :)))
I know how you feel, for the people that know this information, it is boring to go back to basics, but for the beginners it is actually very interesting.
Thanks for the time you put into making this video.
haha of course repeating gets boring for experienced people like you but it's always fun to listen how you do it :)
Lovely demonstration 👍🔥
I'm sorry. I asked about a Chromebook, but didn't mention the make is Samsung. I lost the charger. Can I use another type of charger? I only paid $260 for it. As I mentioned before, the hinge broke on left side after being to tight. Then the screen went blank. It's been 5 months since then. How will it effect the battery or other stuff? Thank you for sharing your knowledge.
This is a very interesting and helpful video. What if the laptop overheats and shuts down after a minute or so? Can we simulate that?
good teacher
Why should u take out the charger and battery, when replacing screen? Is it to avoid turning it on and short circuit the motherboard?
Hi great video here is one idea how to locate the bios chip on 2019 laptops HP there not beside the starting chip w
so were they are located now ?
Very good simulation of systoms, I wonder if you replaced the bios chip with a bad one the bahaver would be different?
Speaking of which: How about simulating this one? A BIOS corrupted during firmware upgrade. The ROM should be fine, just with a corrupt program. Can we recover from this situation without replacing the chip?
Yes you can. You just need to buy a programmer like this.
m.banggood.com/da/CH341A-24-25-Series-EEPROM-Flash-BIOS-USB-Programmer-SOIC8-SOP8-Clip-Adapter-Module-p-1353168.html?gmcCountry=DK¤cy=DKK&cur_warehouse=CN&createTmp=1&ID=2363146&ad_id=328979500272&gclid=Cj0KCQjw4qvlBRDiARIsAHme6ou5434Jg-wWFSnMqpzRa1RVpGavNCY6zWKTb7iHoljSH4Sa9tgI_TAaAm9EEALw_wcB
This one was very important video !!! keep up the good job
Soren man your the man iv been trying to fix a toshiba a665 but i don have 3.3 on the io chip
Very useful video! Thanks!
I have a Samsung np300e5a laptop and one day it just died when on. It has voltage on the BIOS chip, the green charging light is on, the blue starting light goes on when I switch on the laptop it stays on for some time and the laptop turns off. The processor ventilator doesn't go on, neither does the display. Any idea what the issue is? I'm thinking there might be a problem with the BIOS chip that probably needs re-installing.
Thanks in advance!
Cheers!
Sir i like ur videos very much. Ur way of explanation is very good. Pls sir could u make a video on LCD LED Tv PFC circuit explanation.
What do you call that sponge thing that cools down the heated bios?
hahahaha "dont worry we have something to broke" i like that siri... lol
i watch your all video sir thanks for your tut
Great video. Like always, and yeah maybe you can fix the gopro video camera or get a better one. But anyway I appreciate that you are sharing your knowledge. Thanks
Idk if u have done this yet, but could u do a video fixing that dead charger etc thanks
Brilliant teaching video
many thanks, sir.
In which video do you show how to repair a shorted 3.3 or 5 or 19 V power rail ? thx in advance.
Also please do a video on battery power rail i ve come across chrome books that only start when battery is charged
I have a laptop I think I shorted out with the display cable that runs into the motherboard I think there's a capacitor or mosfet broke. Something gets insanely hot in the middle of the board but I have to take it apart to find it
Maybe you can do a video repairing a gopro :)
Hahah good one :D
Hahahahahah
Yes and that broken charger
a cap across the gopros power supply cable perhaps, seems to be emi spike.
31:40
shorted 3,3v bios chip
so to diagnose short you would find 3,3v power rail and put 3,3 from the power supply.
in this example would bios chip get hot?
and how you would identify bios chip is faulty and its needs to be replaced?
never found a faulty bios chip :)
A logic probe or some good oscilloscope would probably show that, if you know what signals should be there, and if you can afford such tools (I can't). The BIOS chip is pretty much just an EEPROM with serial interface, like SPI or something alike, so it should send some zeros and ones through the data lines to the "power up chip" (which is actually a general-purpose I/O port, with a serial-to-parallel interface) when it's working properly. But I don't know how to check it with primitive tools.
As for shorting the BIOS in the video, it was shorted _around_ the BIOS, so it's like it was never connected in the first place, because the current would be through the jumper wire instead of through the ROM chip. So if anything would get hot, it's the jumper wire. Unless you were talking about the actual situation in which the BIOS chip got shorted somewhere inside? That would be quite rare, because the BIOS is not really driving much current in a normal situation, so it cannot get too hot etc. And if it were damaged by some static, it would rather be insulating than shorting. More likely, the power rails can get short, through some capacitor or resistor or some other part that's under constant load during the normal operation.
Very good video.
I have hp pavilion notebook-AB254SA i5 laptop that turns off after 33 seconds. Checked heatsink compound and fan no problems. Removed everything from motherboard except memory and screen. Turn on with power supply and go to f2 to bios screen powers off in 33 seconds. Not sure where to look.
Really enjoyed this video, Sorin. Great idea to take a good laptop and use it to simulate issues and then fix them. Did you solve the electrical issue with your GoPro? You have a lot of patience! Guessing since your multimeter and the GoPro are both connected to the computer for vid-capture, when there's a spark, like you said, it freezes. It must be very well-built to withstand so many shocks internally. Anyways, I'll find out in your later videos if you solved it. : )
Hello sir,
I'm Ajay from india.. can you make video on which are the point where we can supply dc power to find short.
I'm enjoying your all videos.. thank you for information
btw are you using a compressor on your mic with a level threshold.. i hear the level drop when sound go lower.????
omg this gopro killed me also :))
Wow...Thank you sir...good job.🤗🤗🤗
That was especially interesting, thank you.
So what happens if I do not have a 3.3V anywhere (bios, starter chip, power button, so many coils has no power but only one with a voltage moving from 4.2V to 4.8V). would now be the moment to check for a warm component with 19v on jack connector? or 3.3V from ahm... coils? coils' mosfets? anywhere lol? hehe sorry for my lack of knowledge! Have a good day!
Sorry
Great Video. Thank you, i have learnt a lot.
You are number one
Hi, which microscope you use,if you don't mind, can you give the details please, thanks in advance... Nice video and thanks for it..
I have watched at least 20 hours of your videos Sorin but I think this was the best I have seen so far, I hope that you will use this format at least once a week, since it was much easier for me to follow. Also and the same time and since this is a planned event instead of your usual work load you could get a basic schismatic of the areas you will cover. I hope you will not be offended and I offer only as constructive criticism, your hand drawn sketches are very difficult to see especially drawn on paper with a ball point pen. Another problem for me, sometimes there must be an open door the the foot traffic outside of the store giving a lot of background noise. I almost want to run out and buy an old Samsung like the one you use here, as then I could even learn a hell of a lot more referring to your video.Thanks again for all of the effort you take to share your knowledge and experience with us.
I wish to see when without bios, how much amperage, then when 5v is shorted..etc etc..
what Temperature on hot air station should used on Ic (chips) make a video about hot air station temperature suould be used on parts & components to solder and desolder i am learning thats why i am asking
Great video once again.
Quick question that got me curious: by testing for shorts by adding current to the circuit (to understand which component is getting hot), does voltage matters?
Because if i had 19V with 5Amps, when i probe the motherboard i also spark it, and destroy my probes.
Since voltage goes down to almost 0V and current is driven all on it, i believe the current does the magic and voltage is no matter.
What do you think about it?
Thanks
Exactly
How can you check the +5v power supply is ok, if you cannot turn on the laptop? Is it possible to do without a lab power supply?
So nice .. many thanks.. to you..
Nice video love it like to learn micro soldering
dam he is a master in pc,s and electronics i wish i had his brain
Hi, can you simulate a CPU malfunction or Graphic chipset malfunction or even the PCI bridge malfunctions...I mean a CHIP level malfunction, i.e. locking down the clock just like you did for the power supplies or locking one bit of their bus... I'm trying to open a laptop service here in south italy, & don't even know if these kind of problems could arose anytime... please let me know. Thanks. Mario
Ah.. you really love Friday’s!!
is it possible to get a faulty startup chip or bios chip even if the 3.3v are present in the startup chip and bios chip?
Thanks man .. i love yr videos
MY hp monitor takes ages to warm up when coming on..like 15 to 20 minutes.
i have torn the screen apart and even down to the row of light tubes a the ends of the screen..and the connections are soldered well.
but still not working...
i think it may be circuit board on the back of the monitor screen ..the thin strip of circuit that control the leds..
but not sure...maybe it is graphics chip on the board...i am a bit lost
If I short the wrong pins on the power strip connector to start the motherboard, will it create problems or blow fuses or IO chip ?
How about dual N & P burn up and fix? I have a Samsung monitor which keeps burning the dual mofets on the inverter circuit and once the thermal fuse was burnt. Any idea to permanently fix the issue?
Go Pro needs Shielding..
No 3.3V on asus tp300l. Have one with faulty power button. So 3.3V comes just when I press power button and I'm was screwed. :D
Please sir, what is the name of that yellow celotape you using to cover because of heat gun not to get some part damage?
kapton tape ?
can someone answer this , i touch my DMM probe to 19v charger pin on motherboard and it sparks , just one no connection to ground . I dont understand this .
Hi Sorin. If you have any good trick to show us how to find an overloading component not shorted. which mean no short, all voltage are present but the 19.5 drop to 18.5. the laptop dead.
I had sony vio shorted capacitor found on the 19v and removed. the laptop worked 1 hour and died. is any trick nothing get hot.
thanks
Now when it's dead, do you still have ~19V power rail? If yes, follow it to power management chip checking voltage along the way and then from the chip to other supplies. Is 3.3 V (check on BIOS chip) and 5 V (check on USB) present? If some of them is gone look into that power supply. If something is overloading and not on short, it should get warm/hot too for disipating more power.
Thank you for your answer I'll do it tomorrow
I tried all mention but couldnt solve the problem very hard without schematic
No short on the 5 volt checked the usb couldnt find the main PS
3.3 on the bios chip and on the start button
19v volt I have
Sony laptop are very hard
If someone has schematic for E89382 let me know
Thx
Can you see if you have 3.3V on main power supply chip?
Thank you for trying to help me.
Yes there is. This laptop is working differently the 3.3V is always present even if the 19V is not. When the 19V was shorted I still had 3.3V.
I could not find which one is the main 5V
I will try again to check if there is 3.3 on the startup chip.
there is clicking noise and the voltage is dropping after the second mosfet about 1 volt.
Thank you again