Fix Charging Problem In Nokia Handsets

Hello to all again! Today we will discuss about troubleshooting the charging problem in Nokia Devices. But first we need to make oursel...

Hello to all again!

Today we will discuss about troubleshooting the charging problem in Nokia Devices. But first we need to make ourselves aware of different types of categories in Nokia devices.

There are 5 types of categories which are DCT3, DCTL, DCT4, WD2 & BB5. The functionality of ICs depends on these categories in which it's installed.

DCT4 & BB5 are the only two types of categories which are available in the market nowadays, while the rest have been discontinued. However you may receive any type of handsets for repairing so it's important to have a good information for all of these categories. Have a look on the below diagram to have an easy understanding -



How Charging Section Works -




Charging Solution - 

Let's discuss how to repair any type of Nokia device which is not charging.

  • If you receive a Nokia set which is not charging then the first basic step is to get it checked with a different charger & a battery. If it works then good but if not then,
  • Check if there is a loose connection between the charger and the charging jack.
  • If there isn't any loose connection and the charger is fixed appropriately to the charging jack but still the phone doesn't gets charge then we need to check the charging track for open/leakage/shorting condition.
  • In almost all types of Nokia handsets the charging section is of same type.
    • Open Condition -
    • First use the multimeter to check for the deflection on the charging tips. If you don't get any deflection on the +ve tip then it means that the track is in open condition. In this condition you need to check all the components in series track, including fuse & coil for open condition.
    • After you find a component from the series track that is open then you can use a jumper wire to get it fixed so that the current can flow.
    • Shorting Condition - Suppose while checking the charging tips you get a shorting condition then you need to check NPC (Non Polarized Capacitor) and CPD in the parallel track for shortage by removing all of these components one by one till you are able to find the defective component. 
    • Also check the LVR in the charging output for open condition.
    • If you've followed all of the above points but still the phone is not getting charged then you'll need to do HRC (Heat Reball Change) on the Charging IC.
See the below diagram -


Note - 
  • There is a seperate charging section in sets of Nokia DCT3 category. 
  • In DCT4 & WD2 categories, the charging section is in the UEM IC.
  • While in BB5 Category handset the charging section is in techvo (betty) IC.
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Homies Hacks: Fix Charging Problem In Nokia Handsets
Fix Charging Problem In Nokia Handsets
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