Hi @alioop2605 ,
First use a strong light and a magnifying glass to check if the charge port enclosure is clear of any obstruction such as lint or dust. Also check that the pins are all there and that they straight and parallel with each other.
If there is any debris in the enclosure, use a vacuum cleaner to try and suck it out. DO NOT use a metal probe as you may damage the pins. If you have to dislodge any stubborn material, use a wooden toothpick to gently prise it out.
If it seems OK then perhaps the connector is loose on the motherboard.
Here is a link to the ifixit DualShock 3 Hauptplatine austauschen guide.
It is helpful as it shows how to dis-assemble the controller to get access to the motherboard. The USB charge port is clearly visible in the images in the guide from Step.7 on.
If the connector is loose then you'll need SMD (surface mounted device) soldering skills and tools to effect the repair.
If this seems a bit to daunting (the soldering I mean) take the motherboard to a reputable, professional mobile phone, electronics or laptop repair service and ask for a quote to resolder the connector. They have the correct tools and more importantly the skill to do the job.
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