The only other issue I can think of, is that you used a "BIP39 passphrase"... and you're either not entering it now, or you're entering the wrong one... Previously, after entering your PIN, did you have to type in a passphrase using this dialog?:
If this dialog is familiar to you, then the reason you may not be seeing your balance is because you need to re-enable the "Passphrase Encryption" and enter your old passphrase when opening your wallet... without this passphrase, your wallet will be generating different addresses, even though you use the same seed.
When the device was reset, Passphrase encryption will have been turned off... To re-enable do the following:
Step 1. After connecting the Trezor and entering your seed, click on the Trezor device in the left side menu:
Step 2. Then select "Advanced":
Step 3. Finally, use the check box and "enable passphrase encyption" button and follow the onscreen prompts: