ON/OFF Switch on cell phones comes different varieties and forms or designs but the fundamentals on how does it work or where to use it is the same. On Off switch can be determine by the number of its legs or terminals.
This cell phone repair tutorial for beginners covers on how to check the power on off switch on mobile phones and also work on volume key switches.
Here's a brief information on every ON and OFF switch which covers how the components being assembled and by this information you can easily test and check up the said switch if it is good or in working condition.
By checking on off switch is been so simply by just only checking its terminals conducting continuity.
A broken power on off switch can be easily determine when its visual assembly is busted out,
so this procedure below covers only when the said switch visual assembly seems to be good.
This also the first step to repair the mobile phone if unable to power up, its like happens when the phone can accept and show charging if at charging state but unable to power up while pressing the power ON OFF button switch.
The two Legs On OFF switch assembly:
This check up procedure can work even if the ON OFF switch is mounted on the printed circuit board or isolated.
Two check this two legged kind of ON OFF switch is by simply set the multimeter to X1, then connect the two test probes of the multimeter to both legs of the switch, we are just simply trying to check here if the on off switch continuity. Then hold it so that it won't move then simply press it gently. You can easily determine it here when the said switch is working or not by the multimeter response, If the pointer moves approximately 0ohms the switch is good and working, but while if it is not moving at all it means the switch is faulty.
The four legs ON OFF switch assembly:
This check up procedure can work even if the ON OFF switch is mounted on the printed circuit board or isolated.
Four legged On off switch has its both opposite two terminal connected which other, so by checking this said switch is similar to the two legged on off switch. Again. just set the multimeter to X1 and connect the both probes to both opposite terminal of the said switch then simply hold and gently press it to get readings.
If the the multimeter's pointer moves it means it is working while if not the switch is faulty.
If you ever wonder how to determine if the power on off switch line paths is working or not or being cut or open, when proceeding to repair a dead cell phone handset?
This one will help you to a more specific troubleshooting steps,
before looking for or applying a power ON OFF ways solution or modified jumper on it.
This tricks can be applied before or after doing the following steps in repair procedures,
1. the flash firmware is okay
2. the power switch is okay
3. the phone can charge up or accept and show charging indication on LCD display but won't power up
Here's a simple Tricks on how to determine faulty power ON/OFF switch line path on mobile phone's circuit.
By a way of Checking Resistance: This one can be applied if the power on/off line is directly connected to the Power Management IC terminal itself and no other components or open tests spot on the PCB's layout.
Set your multimeter tester to X10 or X 100 and connect the one probes to the power line path terminal of the power on off switch and the other one to the ground. Do this twice by reversing both probes position. If there is an indication of reading it means that line paths is okay, but without any response from the multimeter tester this means that the power on off switch line path is being cut or open. This technique is not just considering that every components needs a connection to the ground to work but definitely it won't work exactly without the ground connection.
By a way of checking voltage: This method can be applied by using a temporary voltage from DC Power Supply Regulator or even a battery itself, if the said handset is manageable to attach the battery without the pcb casing on it. Some mobile phones can be attachable when the battery pin connector is mounted and soldered on the PCB and unlike those have not.
Okay by checking voltage, just set the multimeter tester to 10volts DC, connect the negative probe to the PCB's groundings, then the other other one which is positive to the power on off line path. The voltage reading can reach up to 1 to 4 volts DC depending on which particular mobile phones models. The most important part on this, is that you should get readings to determine if the line paths is okay. Without any reading, the line path is seemingly open or cut.
This cell phone repair tutorial for beginners covers on how to check the power on off switch on mobile phones and also work on volume key switches.
Here's a brief information on every ON and OFF switch which covers how the components being assembled and by this information you can easily test and check up the said switch if it is good or in working condition.
By checking on off switch is been so simply by just only checking its terminals conducting continuity.
A broken power on off switch can be easily determine when its visual assembly is busted out,
so this procedure below covers only when the said switch visual assembly seems to be good.
This also the first step to repair the mobile phone if unable to power up, its like happens when the phone can accept and show charging if at charging state but unable to power up while pressing the power ON OFF button switch.
The two Legs On OFF switch assembly:
Two check this two legged kind of ON OFF switch is by simply set the multimeter to X1, then connect the two test probes of the multimeter to both legs of the switch, we are just simply trying to check here if the on off switch continuity. Then hold it so that it won't move then simply press it gently. You can easily determine it here when the said switch is working or not by the multimeter response, If the pointer moves approximately 0ohms the switch is good and working, but while if it is not moving at all it means the switch is faulty.
The four legs ON OFF switch assembly:
This check up procedure can work even if the ON OFF switch is mounted on the printed circuit board or isolated.
Four legged On off switch has its both opposite two terminal connected which other, so by checking this said switch is similar to the two legged on off switch. Again. just set the multimeter to X1 and connect the both probes to both opposite terminal of the said switch then simply hold and gently press it to get readings.
If the the multimeter's pointer moves it means it is working while if not the switch is faulty.
If you ever wonder how to determine if the power on off switch line paths is working or not or being cut or open, when proceeding to repair a dead cell phone handset?
This one will help you to a more specific troubleshooting steps,
before looking for or applying a power ON OFF ways solution or modified jumper on it.
This tricks can be applied before or after doing the following steps in repair procedures,
1. the flash firmware is okay
2. the power switch is okay
3. the phone can charge up or accept and show charging indication on LCD display but won't power up
Here's a simple Tricks on how to determine faulty power ON/OFF switch line path on mobile phone's circuit.
By a way of Checking Resistance: This one can be applied if the power on/off line is directly connected to the Power Management IC terminal itself and no other components or open tests spot on the PCB's layout.
Set your multimeter tester to X10 or X 100 and connect the one probes to the power line path terminal of the power on off switch and the other one to the ground. Do this twice by reversing both probes position. If there is an indication of reading it means that line paths is okay, but without any response from the multimeter tester this means that the power on off switch line path is being cut or open. This technique is not just considering that every components needs a connection to the ground to work but definitely it won't work exactly without the ground connection.
By a way of checking voltage: This method can be applied by using a temporary voltage from DC Power Supply Regulator or even a battery itself, if the said handset is manageable to attach the battery without the pcb casing on it. Some mobile phones can be attachable when the battery pin connector is mounted and soldered on the PCB and unlike those have not.
Okay by checking voltage, just set the multimeter tester to 10volts DC, connect the negative probe to the PCB's groundings, then the other other one which is positive to the power on off line path. The voltage reading can reach up to 1 to 4 volts DC depending on which particular mobile phones models. The most important part on this, is that you should get readings to determine if the line paths is okay. Without any reading, the line path is seemingly open or cut.
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