If you filed your 2019 return successfully and you received your refund of $1500, then that amount is not taken into account when you amend your 2019 tax return. The previous $1500 would only be accounted for if you had not received it.
When you amend your return, the amended return stands on its own with regard to any additional refund or a balance due. If the amended return you are completing for 2019 is showing that you will receive a refund of $500, then that amount is separate from the previous refund amount of $1500. So ultimately, your total refund for 2019 will be $2000 after your amended return has been processed.
If there was an amount that you needed to pay the IRS due to the changes you made to the 2019 return, then you would see a balance due instead of a refund.
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