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HP LAPTOP CHARGER ADP-65HB 65W NOT WORKING, WHY AND HOW TO FIX IT?

Hi all,

 My HP Laptop charger  suddenly not working 2-3 months ago and already managed to buy new charger. But, but, now have time to have look into old charger to troubleshoot the problem and solve it if possible.

 Symptom of problem with charger:
no DC voltage at output dc connector.

Checked the main plug fuse, and its ok. So, main problem should inside the black square converter box. In order to fix it (troubleshoot the problem or find the problem), the cover must be open and this is by breaking the black cover.
Figure 1: Opening the case for charger


 figure above show picture after case or cover is open.

 then we can visually inspect the component inside the charger.
Figure 2: Two of broken capacitor


 Figure above shows internal component of charger. input supply are from left side which will pass through some important component like rectifier, capacitors, inductors and transformer (part of converter and filter). AC supply power are converted to DC supply that out on the right side of the charger.

 You might trace one by one from input to output..but, it will take time and you need to be carefull not to short circuit if testing while AC supply is ON. Easiest way is to start with doing visual inspection to all component to find damage component, if visual inspection found no visual damage, then you need to use multimeter to check each components in charger.
Figure 3: Remove broken capacitor and install new capacitor


In my case, I got lucky, two of the capacitor near the output DC supply are visually damaged. So, remove old cap and install new cap might solve the problem if there is no other problem in charger,
once new capacitor installed, charger is tested again and it is found out that its working again.
Figure 4: Charger after repair, casing is glued permanently

 Thank you for reading.

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