My hisense tv says to run channel auto scan - Sylvania 6432GG 32" TV

This will be a main board issue, replace the board and the set will work like it's supposed to. I would take another TV and run a channel scan and be sure your antenna is picking up the channels before ordering a main

First make sure that you have the antenna connected to the RF jack. Go to the Home screen of the TV and select the Antenna TV tile on the right hand side of the screen. (If you acquired the TV from a previous owner, they could have hidden this tile. See the steps preceded by Otherwise.) If this is the first time you scanned for channels, just follow the onscreen prompts (including setting your time zone). Otherwise, go to Settings (below Home in the left column on the home screen) > TV Inputs > Antenna TV > Scan again for Channels > Start finding channels. Use the arrow keys to navigate the menus/tiles and press OK to enter. To save, make sure to select Done and press OK.

The manual for the Hisense Roku TV (2019), 32HF4030F is available here: https://www.hisense-usa.com/support/models/32H4030F_hd-hisense-roku-tv-2019 . The current link to the manual is https://assets.hisense-usa.com/assets/ProductDownloads/88/c8c9a74079/Roku-User-Manual.pdf . The section for setting up TV channels starts on page 39 of the manual. See the section starting on page 10 for information on using the remote or TV front panel buttons in the menu.

I hope this helps.

Cindy Wells

If you have a smart phone you can download a remote app to use instead of the original remote. Then you could go ahead and scan the channels after setting up the app.

Check if the antenna plug at back of tv is plugged in right. Otherwise it wont make good contact

Tuner fault. Check and replace it. If you wish to get some details; visit the site linked here. Pull up older posts.
https://electronicshelponline.blogspot.com//

If it is asking for zip code you have not told it to scan for over the air or antenna channels when it asks air or cable

You have to select digital tuner in the setup menu first. Then run a channel scan again.

The main system control memory IC is faulty. Replace it. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

then maybe it can only find 13 channels from your signal then?