How To Use Multi-meter and How To Find Faulty in Schematics - Logic Board Repair Foundation Course
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- Опубліковано 3 сер 2020
- How To Use Multimeter and How To Find Faulty in Schematics - Logic Board Repair Foundation Course.
Fans on CINO Technology UA-cam channel have left numerous valuable comments, such as: how to use a multimeter to find out the faulty? how to use circuit diagrams? two most typical and pragmatic ones. We will give a tutorial on the two valuable questions on this video.
Tools and materials used :
Ionizing blower：www.cinomall.com/collections/...
Anti-static wrist strap: www.cinomall.com/collections/...
Anti-static rubber mat: www.cinomall.com/collections/...
Multimeter: www.cinomall.com/collections/...
Tweezers: www.cinomall.com/products/ant...
Xiaomi 9 motherboard - Наука та технологія
Game changer video for me.
CINO Team thanks for this valuable video. I seen this video about 5 - 6 times to understand more and more and believe me I learn something new from scratch.👌👌👌
Good for you : )
Thanks Cino Technology
THANK YOU FOR HELP
Good tip job.
Number one ☝️ you’re always number 1
Thank you very much
This is some great content, Thanks a lot
Glad you enjoyed it
Thnx for ever..
:)
Nice sir 👍
THANK YOU SO MUCH BROTHER ....YOU HELPED ME ALOT
: )
This is absolutely powerfully helpfully video tutorial, A huge thanks for CINO Team!!!!! Please make more videos about the MObile Phone REpair Technic??!!
OK ：）
@@CINOTechnology ✨ congratulations may god bless you abundantly 🥰may all ur dreams come true ❤️...I need help wanted to know about mother board can we repair it if it drained in swimming pool (S10) ..can we get our data back
love cino
Thank you
Best channel ever
Thank you very much!
thanks a lot for this useful video please share much more videos about schematics and mobile circuits
OK
best ideas thank you thank you from iran
: )
Vvvvvv nice and helpful first view and like
Thank you!
Thanks for your information,please make a video about diode mode and how can troubleshooting with multimeter, that can be very helpful
WE will♥
You are the best
Thank you!
Really appreciate 😍
:)
@@CINOTechnology I want contact you.
@@aniledirisinghe2767 CINO Technology WhatsApp +86 13410892094
Great video thank you. What schematic program do you recommend for Samsung phones? I'm trying to fix a sm-a715f with a backlight issue and can't find a schematic anywhere...I'm also a beginner so without it I'm not sure I can do it
CINO Technology WhatsApp +86 13410892094
Game changer video , can you add a video by examples like the scenario that are using them so its easy to understand?
get
thnx a lot..😍😍
Thank you for watching
to fully master this work, where should I start, and from what beginning did you start, I will be very happy if you tell me
thanks 💚💙💛❤️🧡🤙👍
: )
Well leading....
Thank you
hello thanks for the wonderful job i really like you work please can you make video on i phone circuit diagram thank u
We are preparing a technical maintenance teaching video，will be more detailed
I have a problem diagnosing power failures. I want to learn more
Thanks for another great video. You mention connecting USB cable so that I can measure voltages.Can you please give a clue to the following problem? Huawei 7A, was dead. After changing power controller there are voltages but lower than should be.( as a result the phone does not start) . E.g VPH_PWR should be 3.8 - 4.2 V but here is only 3.5V. Also all other voltages are lower about 0.3V than should be according to the schematic. Do you have any idea where can be the fault? Thanks again for your videos and your reply.
If the VPH_PWR is pulled down by 0.3V, look for current leakage by connecting it to the DC power supply. Finding current leakage is difficult because all the capacitors, diodes and Ics on the VPH_PWR line may cause leakage.
However, there are two circuits that most likely to cause current leakage. First, it is necessary to confirm whether the DC power supply voltage is VPH_PWR or VBAT. The simplest method is to adjust the DC power supply voltage to within 2.8V, if the DC power supply voltage is lower than 2.8V, then the leakage is VPH_PWR line leakage and vice versa.
Search VPH_PWR or VBAT on the circuit diagram, you can get all the circuits related to it. The current leakage fault will be fixed, and the not turning on faulty also will be fixed.
@@CINOTechnology Thank you for your reply.
Please answer these questions:
1; You say:"First, it is necessary to confirm whether the DC power supply voltage is VPH_PWR or VBAT." Do you mean if input voltage to POWER CONTROLLER is VBAT or already VPH_PWR ?
2:You say:"The simplest method is to adjust the DC power supply voltage to within 2.8V, if the DC power supply voltage is lower than 2.8V, then the leakage is VPH_PWR line leakage and vice versa." Do you mean I set 2.8V on power supply and measure if there is still leakage. if so VBAT path problem. THen I set lower than 2.8V on power supply and measure again if there is a leakage.If so then VPH_PWR path problem?
Thank you very much for help.
@@ladbla1752 1. VBAT and VPH_PWR always exist no matter the phone power on or off, as long as they are connceted with DC power. VPH_PWR is the system power supply converted from VBAT by PMIC.
2. When the phone battery voltage VBAT is lower than 2.8V, the circuits that need direct supply from VBAT will stop power supply due to insufficient voltage, but VPH_PWR still need power supply from VBAT. Therefore, when the 2.8V VBAT voltage is connected, PCB leakage is tantamount to VPH circuit leakage, and vice versa, or both of them have current leakage
@@CINOTechnology Thank you for explanation. To be sure I understand:
1.PMIC needs about 2.8V ( VBAT) to provide VPH_PWR. Correct?
2.When voltage from the laboratory power supply is lower than 2.8V, and there is still leakage, that means the leakage is on VBAT path - because PMIC that creates VPH_PWR does not work at such low voltage. Correct?
3. When voltage from the laboratory power supply is higher than 2.8V, and there is leakage there can be leakage on VBAT or VPH_PWR. But if I already tested with lower 2.8V and there was no leackage, now it means the leakage on VPH_PWR path.Correct?
Thanks for your time and help.
Please make a video on what is vcc and vdd main , and how to find vcc and vdd main on iphone board .
OK, we will do that
Hello, thank you for your good channel .. How can I have a schematic of different types of phones? please answer
zxw
How to avail schemstics and board view for all android mobile? Anyway nice video vety informative
there is a software named ZXW
Where can i found this schematic software
Kindly Share links on how to download mobile phone schematics
Where can i found schematic and board view file and which software can use?
CINO Technology WhatsApp +86 13410892094
What is best low cost multimeter for phone repair ?
This one is a good choice : www.cinomall.com/collections/tools/products/digital-multimeter-fluke-17b
which software was used for bitmap and schematics
ZXW
Sir which is best dc power supply 4 digit or 5 digit
It should be this one: www.cinomall.com/products/atten-ms-300-3-in-1-combination-hot-air-gun-desoldering-station-dc-power-supply-maintenance-system
@@CINOTechnology Hi sir how much will it cost me to have this tool...im from South Africa
Sir Ek video hindi language mein bna sakte ho aap hamaare liye please🙏
what do you mean by clock?? it's not watch, right?
Clock Signal. Consider it as a signal to control your phone's clock.
Please give subtitle indonesia🙏🙏
We know nothing about indonesia language sorry bro/(ㄒoㄒ)/~~
Why you start by telling us which schematic app you using!
Please add Hindi subtitles
We will try
Me: Finally found where my time is meaningful.
Me: DONT forget to dubscribe. 😊
OK
Hollywood moovies give viewers to time to reading subtitles.... U haven't time to give read the subtitles.... How we read this... Give little time to read.... Every second pause and read.... First u make all work have to done after make video... Cooking washing eating etc.....
hello, I saw very good videos on your channel and very helpful, my question is if I can write to you at the Whatsapp number? because I need recommendations since I am a beginner and I need help with schematics!