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Learn Smartphone PCB Step by Step in 2019

26 Dec 2017
Actually, circuit and boards usually are made up of fiber. it can be also said two kinds glass and plastic. the smartphone circuit consists of plastic fiber. fiber is a good electric conductor that current never Burn It.

What is the Fiber Circuit of Smartphone?

phones on the market have a fiber circuit with electronic components in it
the smartphone circuit
plastic fiber

you can see the picture the smartphone has green circuit is the copper wire is placed in the mid it cannot be seen but it exists you can see the LCD Jack so this is copper layer the fiberboard that consists on copper print
copper layer
copper print

What is Copper Print on Latest Smartphones?

you can see this speaker which is attached to this point. This is print, the point of the wire is attached here and another point is punched by the machine when it becomes Golden in color and placed with any ICs or apart so when you put the battery inside the smartphone different ICS get active for working

whats speaker IC do to it actually create flow of current sense to the parts and then this print to spend in the fault diagnosing process is the reverse action that is first we check the print and we see the component then IC so the print reflects every part of the phone this is called PCB mains printed circuit board PCB exists on every smartphone. as we know, now the mobile screen size of the next generation of Android phone is a larger screen smartphone.
fault diagnosing process
Golden in color
nowadays every android phone has a touch screen display. newly launched phones like galaxy s9 and Samsung galaxy note and others come with the best-operating systems. the common faults on mobile os are Poor Battery Life, slow charging with charging cables, wireless charging error, touch screen not working and phone overheating when using mobile data. Those all functions in the smartphone are control by additions ICs like Touch Controller IC, USB Charging Port Controller IC, Power Management IC, Application Processor, baseband processor, and Nand IC.
this printed circuit board cannot be repaired in two situations. I will tell you both two methods to repair any smartphone PCB step by step in my next article so keep visiting my blog.
Read Learn to Repair Smartphone Printed Circuit Board Step by Step part two

Mobile Phone Hardware Repairing ( about faults comes with IC )

We can divide all Mobile phone damages into Hardware, Software and Settings faults. when we think about hardware damages or faults mainly we want to know what are the smartphone main ICs and faults comes with IC. Old phones had ICs more than latest phones. However when you get complete idea about that ICs then you will be able to find the solution for damages in your phone properly.Check following list of ICs and try to understand about that faults.

Power Amp

Antenna Switch

RF Processor (Hagar)

Power IC


Charging IC

Flash ( ROM or EEPROM)

Oscillator (VCO)


Key Pad

Antenna Switch IC

Antenna switch helps to filter frequency Bands
Some Frequency band are not worked properly

The phone will heat Antenna Switch, Antenna switch helps to filter frequency Bands as 900Mhz, 1800Mhz and connect Rx, Tx( Receiver and Transmitter). Therefore when damage this IC we can see faults as following.

Signal Drop

No Network found

Some Frequency band are not worked properly RF Processor ( Hagar IC)

The next part of this article will be published very soon. Keep visiting my blog for next post.

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