HOW TO FIX TECNO CX LIGHT DISPLAY

Hello today   I am very happy  to share with you  about the little knowledge I have related   to solving the  light display problem

on tecno common cx

 1. how you detect your device have a light display problem.  first, you want to power on your device and look close on display if you do not see anything use any liquid but it better you to use petrol,      sprit, or Benzin put three drops of one of your liquid you have on display and anointing on top of the display and look again by using light like torch or bulb  you and power on if you see the logo or picture inside it means that your device have a light problem and solve by using this bellow method  

2. OPEN BACK COVER

This is how tecno common cx look like this on the picture below when you open the back cover 

  

3. AFTER REMOVING THE BAT YOU SEE THIS PLACE

The picture below shows the component which has a share of light place and shows you all components   that together they help to create the light on the display.,

This is the light now you see five components of electronics    

 BELOW I EXPLAIN THE COMPONENT TO MAKE  YOU  TO UNDERSTAND

4.  COIL  

The coil is an electric cable piece which has two side A and B round in circumstance and makes the two sides of the cable on to be input and another output this component of mobile phone used to transfer the voltage and coil act like a fuse.

 

The picture above shows the coil ok I want to talk about how to measure coil by using a multimeter. take your meter and set on diode mode or buzz mode then take two nobles black and red block nob put on one side of the coil and another nob put on another side when you hear the sound its means the coil its good you don't need to change it but if not hear any sound it means the coil dead you need to change it.  

PICTURE BELOW SHOW HOW TO SET MULTIMETER ON DIODE MODE OR BUZZ MODE

6.LIGHT IC           

On this phone, light ic has 6 legs this place is main where light comes from or you say is the brain of light on the display. Light ic cant be dead many much ic light ic dead you can see b look at they are legs or look on top of if you can see either bust. If you can see something like that you need to change the ic.

                                                                                                                              

                                                                       

7.  DIODE

a diode is an electronics component that has to allow an electric current to pass I one direction.called the diode forward direction while blocking it in the opposite direction called the reversal direction 

              

the photo above shows the diode .light diode, the light diode is the different of other diodes on a mobile phone this diode work difference on that part where found. the light diode has + and - side and on the motherboard hasn't any ground when you measure diode side have you can't get any ground if you get ground the problem here light never come out but another diode on mobile thone have + and - but on the motherboard have a positive side and ground side when you change diode you need to make sure where + side be + don't set against it bunt

HOW TO MEASURE LIGHT DIODE

first, you need a multimeter 

and then go to your diode light you need to test

 

As you see that I show is a diode and have two sides + and - so how you determine which side is + and - if you look carefully on the top of diode the side I put +have black line  and another haven't the line 

 

So if you want to measure the diode set meter like you see on the picture above and black noble put the + on the diode and red noble put on -  of diode side this go vise-versa   when yo see read the number from 140 up to 350 that diode is good but if you ear sound or above 500 that diode you need to change and if you want to change diode you don't mix the side + and _ when you make any mistakes the diode die and it better to change diode from a light place or you change new one special for light

8.CAPACITOR

A capacitor is a device that stores electrical energy in an electric field. It is a passive electronic component with two terminals. The effect of a capacitor is known as capacitance.

On that picture above I draw with a red color that you see is a capacitor in a light capacitor has two sides positive and negative the one side of the capacitor has ground and another is the positive of the light

HOW TO MEASURE CAPACITOR

Use meter like this and then set the meter on buzzer mode and measure the side of capacitor put black noble and red noble put on the side of the capacitor the one side read number and if yo exchange noble cant read anything that show you that capacitor is good