Posts tagged Mobile Repairing Institute

laptop repairing course

Gratifying Laptop Repairing Course At Chiptroniks Institute


In this innovative and advanced world laptop devices are most popular. This helpful and proficient laptop systems are coming in different editions as well as capabilities. Laptop device is utilized in various sectors like workplaces, academic industries as well as universities as well as other organizations.

If you wish to do laptop repairing or just to fix an issue there is some important thing you should know. You may establish your own business or laptop repairing center. If you are going to understand the major technologies of making more and more money doing this, so let’s start.

laptop repairing course

This laptop repairing course offers to the applicants a deep observation on the repair of chip level components of the laptop. These laptop repairing courses offers enough knowledge to the applicants that they may easily become qualified to select the proficient industries to make their wonderful future.

The demand for laptop specialists or technicians is growing day by day. Nowadays there is a huge demand of laptop technicians. Plenty choices are open to the laptop technicians for the various reason like every second person are utilizing laptop device these days. Various people are experiencing different problems related to laptop as well as require a laptop repair engineer or specialist.

In these days laptop repairing institute provides a broad range of the courses to the applicants as well as the proficient too. After completing the laptop repairing course from any good institute, you may get more and more the chance of getting the best job.

Mobile Repairing Course

Why You Should Take Admission in Mobile Repairing Course?


Nowadays Mobile phones device has turned into an useful piece of our lives without which individuals can’t survive. Many people believe that while a mobile phone is damaged it is better to replace it than repair it but this is not true in all situations. A smartphone or mobile phone may be easily repaired and it does not need much time to do so nor does it cost much.

Key Advantages Of Mobile Phone Repairing training

An increasing number of cell phones are getting repaired these days, so cell phone repair courses can make a source of earning.

These courses are typically short term courses with short budget as well as students can do both full time as well as part time course whatever suits you.

Mobile Repairing courses not only teach you how to repair a mobile phone but can turn you into a proficient technician able of setting up your own business.

Mobile Repairing Course

There is a enormous shortage of skilled proficient technician in this field and this demand is ever growing.

It is very significant to search the high-quality institute to learn mobile phone repair to manage mobile phone for lifetime performance. The easy way to search the good institute to look on internet where you can search the long list of institutes which provide mobile repairing courses in your location.

After doing mobile repair courses you can easily enhance your income with a part time cell phone repair job or can establish your own repair business. Many institute offer short term course which duration is normally 45 . By using the minimum of time or resources an efficient way of earning can be found out. Many mobile phone repairing training institute also offer career counseling after successful completion of the course.


mobile repairing course

Bright Career in Short Term Mobile Repairing Course


Mobile phones are considered to be one of the significant components for the person. In easy terms, people are said to be incomplete without the cell phones. They are the resource of the connection as well as interactions among the individuals. But however, as we see that every single technological innovation has to go through some of the problems and complications.

In the same way, as a the mobile phone gets broken, it has to get fixed by taking the help of the professional. But now the major query is that there are many such individuals who take advantages of mobile repairing. Well, there are many facilities that even support, the technician with the fixing techniques in much easier way.

mobile repairing course

Chiptroniks conduct mobile phone repairing training course for students who are not able to attend our classes and are so far from us. This is a home learning as well as a corresponding type of training to learn mobile phone repairing as well as fixing.

In this course we will guide you to learn mobile phone repairing from the comfort of your home by taking your own time during self-study. It is not only useful for people from a technical background as well as engineers, but even if you are a total novice or a Do-It-Yourself type you can easily join and learn the skills required to repair mobile phone devices.

The mobile phone repair training is conducted by a tutorial DVD (containing videos, guides and manuals).

Mobile Repair Syllabus

  • Basic Electronics
  • Information of Mobile Phone Technology (CDMA, GSM, Chinese)
  • Knowledge of Microchip and Micro Processor Technology
  • Chip Level Practical Training
  • Circuit Diagram of Different Types of mobile phones and complete Software Installation
  • Tracing as well as faults in hardware & Software
laptop repairing course

laptop repair debug card


laptop repairing courseMost of the repairing engineer check voltages up to Power on of CPU and the process after CPU get reset signal to the stage where display comes is full of interesting stage. The real magic is how the CPU addresses several North Bridge, South Bridge, BIos rom and system RAM . How does the bios code is run from BIOS Rom by CPU .How is it connected ? and how do we check that the CPU after getting power is ready .There are several signals involved and several addressing mechanism. There is lot of computer architecture involved , but i will simplify things in my coming video. Even though 90% of problems are power related, but if we know this stuff ,we can understand each error message in debug card . So in my coming post i will discuss about memory addressing, Bios rom access, PCI & PCI express connections.

In our laptop repairing training , we put emphasis on complete solution right from hardware to software(power issues, bios issues) .For properly using debug card one must have good knowledge of various bus connections in the laptop.

laptop repairing course syllabus 3 month


laptop repairing course syllabus1 month


Hardware Identification

  • AMD CPU Info: Software from AMD to correctly detect the installed AMD CPU on your PC.
  • AMD CPUID: Software from AMD to detect the CPU clock, L1 and L2 memory cache, model, revision and supported instruction sets.
  • AMD OverDrive: Program for identifying, monitoring and overclocking AMD CPUs.
  • AMI Motherboard ID Utility: Finds out your motherboard manufacturer if its BIOS is from AMI.
  • BIOS Agent: Software that identifies everything about your BIOS and the need of a BIOS upgrade.
  • Cpuid: Identifies the installed CPU.
  • Cpuidw: Identifies the installed CPU.
  • CPU-Z: Identifies the installed CPU.
  • CD-R Identifier: Identifies the CD-R media brand name. It is necessary to install ForceASPI first, which is also available at this link.
  • Codec Check: Small utility that detects which audio codec your motherboard has, allowing you to install the correct audio driver on your system.
  • Ctbios: Finds out your motherboard manufacturer.
  • Ctbios 1.5: Ctbios more updated version. Besides recognizing your PC motherboard manufacturer, it gives you a lot of information about it. The only problem is that this is software is in german.
  • Ctp2info: Checks if your Pentium II or Pentium III processor is counterfeit or not.
  • Ctpci: Lists all PCI devices installed on your PCI. Very usefull to find out your motherboard real chipset.
  • Dimm_id: Checks if the type of SDRAM memory installed on your PC is PC-66 or PC-100.
  • EVEREST Home Edition: Indentifies your PC hardware, including your motherboard manufacturer and model.
  • GPU-Z: Program that reports all features from your video card graphics chip (GPU).
  • Hwinfo: Excelente indentification software. Very useful to determine your motherboard manufacturer, model and chipset. More updated than Ctbios.
  • Intel Turbo Boost Monitor: Small utility to monitor Turbo Boost tecnology.
  • MobileMeter: Program for monitoring the temperature, clock rates and battery charge/discharge from your laptop.
  • PC-Config: Identifies all components from your PC.
  • PC Wizard: Program that identifies all hardware parts installed on your PC.
  • Sandra: Identification, test and benchmarking software.
  • Unknown Device Identifier: Software for identifying unknown devices installed on your PC, excellent to find out more information about devices Windows isn’t able to correctly detect.
  • Wcpuid 3.0: Identifies the installed CPU, giving you detailed info about it.

power delivery system in motherboards


In this article we will discuss Power Delivery system in Motherboards . For more in depth training , join PCLR Course of chiptroniks or you can also buy our course materials with online support.

Power Delivery

Power delivery—Why & How

Why: Motherboard components need one or multiple stable and clean DC power to work correctly

How: (1) Power Supply directly to motherboard components (2) for the power which Power Supply can not provide directly, DC to DC power converter on the motherboard converts the power and provide to components

Voltages type needed

Postive DC Voltage: generally between 0V to 12V, generated by DC-DC converter 0.75V, 1.5V, 1.1V… or directly from power supply, like 3.3V, 5V, 12V

Negative DC Voltage: typically -12V

Motherboard voltage normally ranges from -12V to 12V

Tips: General speaking

Higher speed component=> lower voltage needed

(especially for IO function)

Current types needed

Simple answer: Power/voltage=current needed

Low power device: <2A, example: Clock chip, LAN…

Medium power device : between 2A to 50A: example: Fan, DIMM, Chipset

High power device: >50A, example: processor, high power DIMM, high end Graphic card etc

The low/medium/high is just general category, no standard

Tips: High current device has higher requirements on the PCB

Space, layers, cost, copper thickness…, all in all, bigger current,

more design challenge for power designer and CAD engineer

Examples: components Voltage & Current

1.0V to 1.5V, 50A to 150A, 130W

1.8V/0.9V for DDR2, 1.5V/0.75V for DDR3, 20A to 40A, 50-100W

Chipset: 1.1V, 10-20A, 5W to 30W

Onboard device: 1.5A, 1-2A, 3.3V, 0.5W to 5W

PCI slot: PCI slot: 12V, 0.5A, 3.3V, 3A, 5V, 1A, 15W, 25W, 75W or more

Fan connector: Depends on fan used, ranges from 0.1A to 5A, 5W to 50W


Normally 1 Components need multiple voltage rails

depends on what function needed, such as ICH need

1.5V, 3.3V, 1.8V…, more function, more voltage rails needed

For example: ICH has more voltage rail than CPU

due to ICH has more functions

Voltage types by components function

Components may need several voltages by functions: below is general category

(CPU), VDD (DIMM), occupy most the power pin of the components

IO Voltage: Core Voltage: Main voltage for core logic, most of the power consumes on the main voltage) for the core function, example VCCP Voltage for BUS, example: CPU Vtt

Reference Voltage: voltage used for signal sampling

Analog voltage: Some components include analog function, so analog voltage needed, such as Video, PLL circuit, analog voltage require to be clean ! Need to be separated from normal voltage

Components may contain 1 or more type of voltages depends on

Function needed, such as ICH need all 3 above voltages

Voltage types by power state

Some voltage are only required for certain power state

Normal Voltage: Voltage existing when the system is at S0 to S2 state, which means system is at ON state, like CPU main power, fan power, which is main power for the system

Battery Voltage: Voltage existing when the system at AC OFF status, it is powered by onboard battery. Example RTC clock

Standby Voltage: voltage always exists at S0 to S5 state (DC OFF), which means system at DC off state, AC power code is plugged, it is used for board power on/off logic and wake up function and some management function and other functions need to be functional at main power off state, remember, when AC power cord inserted, standby voltage exists !!

Aux Voltage: Voltage switch by between Standby voltage and same Normal Voltage, the main reason of Aux voltage is the function is needed through S0 to S5 state, but standby power can not provide enough current at S0-S2 state due to the device consume more power at S0-S2 state then S3-S5 state, so voltage need switch from standby voltage to normal voltage to get enough current , example: DDR voltage 1.8V, when system is at S3, the Aux voltage comes from 1.8V standby power to keep DIMM refresh, after power on to S0 state, Aux voltage switch to 1.8V normal voltage to support DIMM normal read/write (which consume much more current)

Components may contain 1 or more type of voltages depends on

Function needed, such as ICH need all 4 above voltages

Let us take a look at a real sample-Chipset

G41 MCH (north bridge) function/power mapping

(not exactly correct, just for example)

Another example—ICH 10

ICH 10 has require more than 20 voltage rails !! due to lots of functions integrated in ICH 10

Refer to product EDS for pin definition and power requirement

Example 3—PCI-E slot Power requirement

This voltage supply to add in PCI-e card, Card is required to design within this limit

Overall Power Delivery Example–Thurley

Overall Power Delivery Example2—Romley

Motherboard Input Power

Now, we know what kind of power (voltage/Current) needed by components, but where does it come from? Answer: from Power Supply, directly or indirectly

Power Supply Output (motherboard input)

Power Supply output type:

Multiple Output:

Power supply has multiple DC output rail (NOT connector)

Popular 12V, 5V, 3.3V, -12V, 5VSB and other voltage

12V output may have separate rails, like 12V1, 12V2, etc for 240VA protection

Single output: 12V or other voltage only

Power supply has single DC output, 12V is most popular

Battery is single output example

Power Supply output interface:

Connector: board to board or board to cable connector

PCB gold finger: PCB to mating connector


Most of single output PSU also has standby output, like 5VSB

Power Supply Output example 1

Desktop ATX PSU : Multiple output, cable + connector

Server EPS12V : Multiple output, cable + connector

Power Supply Output example 2

Notebook Adapter:

19V Single output, connector, connect to motherboard directly

Hotswap module :

12V single output, gold finger and board to board connector


normally it also has 5VSB output

Motherboard side interface

General Rule: mate with power supply output


Gold finger mating connector

Board to Board connector




Motherboard power rails & Power supply rails

As we talked before, multiple-output power supply has multiple output, each rail will have current limit, and each rail are separated below is example


Same for motherboard, motherboard will also have multiple rails, like 3.3V, 5V, 12V1, 12V3a…, each rail has current requirement, so we need to mapping the power supply rails to motherboard rails to make sure both power supply & motherboard rails can be met

Next page is example


Rail mapping Example



Power supply connector/rail mapping


Power supply rail can be separate to support multiple

motherboard rail, but reverse is NOT allowed!, otherwise it will

Short power supply rails and cause protection

DC to DC converter

So far, we know how power supply provide voltage rail to motherboard, like 12V, 5V 3.3V, etc by connectors or PCB gold finger or other method, but for the other voltage power supply can not provide, like 1.1V, 1.5V, 0.8V, we need DC to DC converter on the motherboard to convert the power supply voltage to the voltage we needed

DC to DC converter also called Voltage regulator (VR)

DC to DC converter (VR) types

(1) Linear voltage regulator

-Low current

-Low efficiency

-Low cost


-Clean (little noise)

-High current

-High efficiency

-High cost


-High noise

Linear VR

Simple & Clean (little noise)

-Low current

-Low voltage drop

-Low efficiency

-Low cost


(1) Why low current and low voltage drop?

vdrop on the VR= Vout-Vin, so the power loss = I x Vdrop, for example: Vin=3.3V, Vout=1.5V, 2A, so the power loss on converter is (3.3-1.5)x2=3.6W, assume 50C/W, so the temp rise will be 150C, which is burn the components, so only low current and low voltage is allowed, Linear VR only support low current requirement

(2) Why low efficiency?

The efficiency= output power/input power, obvious, it is low efficiency due to the power loss on the converter is big, the bigger difference between Vin and Vout, the lower efficiency is.

(3) Why simple & clean & low cost

It is simple & due to just a few components needed

It is clean due to no switch components, it is easier to place & layout the linear VR

Switching VR Types—Single Phase

-High current

-High efficiency

-High cost


-High noise

Basic working principal is by control the mosfet PWM value to adjust the output voltage, Vout/Vin=PWM%, for example: 12V to 1.5V, PWM=12.5%

Switching VR efficiency is between 80 to 98% depends on VR design, the main power loss is VR Mosfet switching & conduct loss

It can handle high current due to high efficiency

High cost /complex is obvious: it need chip, mosfet, inductor, capacitor…

High noise: due to switching method and mosfet switching, it has much higher noise than linear regulator

We will NOT discuss how VR works here, refer to VR training slides

if you are interested, Overall speaking, VR is a complex technology


Switching VR Types—Multi Phase

VR example

Switching VR—single phase 12V to DDR 1.5V

Switching VR—multi phase 12V to CPU Vcore

Linear VR–3.3V to IOH 1.8V


Linear VR–3.3V to IOH 1.8V

VR placement & layout

CPU VCCP VR placement

CPU VCCP VR copper planar

Mobile Software Repairing


When some fault develop with the mobile phone handset, one can repair it using the following methods

  • Hardware Repairing
  • Software Repairing

Hardware/Software Repairing

In hardware repairing, various components of the handset is checked for faults. One should first check the battery for proper supply and contact, replace with a known fully charged battery and check the handset.

Next, various points on the circuit board should be checked for proper voltage/signal.

If one finds some problem with the components, then it is called hardware fault.

If the fault could not be diagnosed at the components level then the-fault could be with the software inside the handset.

Program to help the mobile phone carry out its different function are stored inside the mobile phone’s flash memory. This program is commonly known as “mobile software”.

This software could become corrupt due to various reasons and could generate different faults. Some of the faults due to problems with the software are

  • Dead mobile phone
  • Hanging of mobile phone
  • Phone automatically restarts
  • Automatic Security Lock
  • Network related problems
  • Mobile shows wrong functions
  • Lose of content etc

Many a times the non-operation of the handset could be due to some fault in the hardware and the software both. If this is the case then one needs to first rectify the hardware fault before trying to clear the software fault.

Various Lock of Mobile Phone

One can also use the software to remove various lock of the mobile handset. Following are some of the locks which can be removed using the software.

  • Keypad Lock
  • Phone Lock
  • Security Lock
  • SIM Lock

Keypad Lock

As the name suggests this lock, locks the handset’s keypad, one will not be able to use the keypad for any type of number or text entry.

Even when the keypad lock is active one can answer incoming call by pressing the keypad keys.

Different handsets use different method to enter into keypad lock mode and to remove the lock. When the phone is in keypad lock mode, pressing of any key on the keypad will display a message on the screen, explaining the process to unlock the keypad.

Phone Lock

In this mode the handset cannot be used to make/receive any call, even though the keypad stays active during this lock.

In this mode, when the handset is switched on, it asks for an unlocking code known as PiN or “Personal Identity Number”.

If this PIN is entered correctly then only one can use the handset. This prevents an unauthorized person from using the phone.

Security Lock

Security lock is used to lock all the functions of the mobile handset. When the security lock is on, the phone asks for the PIN code when it is switched on.

Some handsets may ask for the PIN number even when the SIM card of the phone is changed.

This facility is not provided on all handsets.

SIM Lock

When one buys a mobile handset from mobile service provider under some scheme, the provider may lock the handset with the SIM card in the phone.

This prevents the user from using the handset with SIM card from some other service provider.

Note: If wrong PIN code is entered more then a set time in a row, the phone becomes permanently locked and you need to take it to a service center to unlock it.

Most of the handsets use 0000, 1111, 1234, 8888, 9999, 12345 etc as their default security code, which can be changed by entering into proper menu option.

For more detailed training , join our mobile repairing course

Mobile repairing basics


In this post we will discuss about Motherboard of mobile Phone. We have been getting lots of requests from technicians worldwide to release some helpful notes . And CHIPTRONIKS has emerged as the friend of all mobile technicians and students . In this post our  Head Instructor Mahesh Chabbra  will dsicuss the basics of Motherboard of mobiles . Meanwhile Admissions to our Courses are open  . Call on our helpline number 011-47592046 for any query.

A typical mother board is constructed using two main things

  1. Fiber Plate
  2. Copper Plate

These two plates are joined in three forms.

  1. Single layer board
  2. Double layer board
  3. Three or triple layer board

A single layer board is constructed using one copper plate and the other fibber plate. Its one side is copper faced and other is fiber faced.while a Double layer board is made with two copper sheets ad fibre sheet. It’s one side is copper faced and the other is also copper faced and the fiber is stcked between two copper sheets. This kind of board holds electronic components on both of its side because both copper sided prints anre inter connected with one another on proper placesA three layer board is made with three copper sheets and two fibre sheet. As it is shown below.

Basics about Mother Boards

Different mother boards have different views but many things are common in different brand mother boards.first common thing is ,every mother board has radio Section on top of the mother board

On a conventional cell phone mother board there different kinds of mother boards, some are thick and some are thin enough to see easily.The thick and thin tracks transfer current and data to from one part of the mother board to another.the thick track passes huge amount of current in it so it is a very low risk that these tracks will burn up.

A special track which is very thick and makes portions on a single board is called portion is located on the above picture. This track is making different sections apart.

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