The Samsung Galaxy Tab 3 7.0 (SM-T21XX) does not support MHL. The Tab 3 8.0 does support MHL.
The manual for the Tab 3 7.0 is available on the product page: https://www.samsung.com/us/support/owners/product/galaxy-tab-3-7-0-wi-fi . The only TV feature listed is using Galaxy Tab 3 7.0 as a remote control for your television. You need to accept the Samsung terms of use to download the manual (expand the section on languages).
I wish that I had better news for you.
Cindy Wells
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SOURCE: No cable signal on 32" flat panel Olevia tv
When you write 'tuner,' do you mean the internal TV tuner or do you have a cable box between the wall connector and your set's input?
If you are connected from the wall to the set, then the sensitive circuitry (it may only tolerate a few volts max video) is damaged.
If your set was a couple of decades old, it might be fairly easy to repair.
If the set was damaged via the cable service, you may have some recourse unless your cable provider has seen fit to absolve themselves from liability, I suspect they have.
I do not know your set but it is not impossible that the video input circuitry for cable and antenna is on a smaller assembly that processes it before reaching the main board.
The latter has obviously survived since you still have the other functions.
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