Why won’t my kindle fire charge
Won’t stay on or charge
Does the tablet indicate that it is charging when the charger is connected to it?
If so and then if the battery doesn’t charge it seems as though there may be a problem with the battery.
Suggest that you first replace the battery and then check if this has resolved the problem.
Here’s the ifixit Kindle Fire HD 10 Battery Replacement guide that will help.
ifixit has replacement batteries for the tablet, just click on Buy in the Parts section of the guide. Note the shipping restrictions that apply.
Alternatively search online for Amazon Fire HD 10 (7th Gen) Replacement Battery for other suppliers.
If the tablet shows no indications at all when the charger is connected have you tried a different compatible charger to see if that worked?
If it still doesn’t charge with a different charger, visually inspect the charge port in the tablet, using a strong light and a magnifying glass to check if there is any lint etc trapped in the port enclosure that may be preventing a good electrical connection and also that all the pins are there and that they’re all straight and parallel and not broken or bent etc.
If there is debris in the port enclosure, do not use a pin or probe to try and get it out as you may damage the pins. Try using a vacuum cleaner to see it if can be sucked out of the port enclosure. if still no good, try using a sharpened wooden toothpick to gently prise it out.
If the port appears to be OK then the tablet will have to opened and checked as to what the problem may be e.g. loose charge port, etc