Magnavox tv/dvd/vcr combo model mwc24t5b i put a tape in the vcr hit play and the tv shuts off. everything else work fine on the tv.

Question edited for FULL 'make model (what it is)'.
Question moved the correct category..

Here is your manual

https://www.manualslib.com/manual/413296/Magnavox-Zv420mw8-Dvdr-Vcr-Combo.html#manual

https://www.google.com/search?q=Magnavox+ZV420MW8

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In my research, I learned about finalizing the DVD, which was a new concept to me. I looked that process up in the manual and it did the trick.

I've found the center LED in the VHS player faulty with those symptoms. Change it you'll be fine. Larry

You will need to get new cables.

Try putting in a VCR tape let it load and hit stop. If the set stays on it's the VCR deck causing the problem. It will be either be bad sensors or LED or possibly the mode switch. Let me know if this helps.

you probable have a dirty video head...you can try a tape head cleaner tape/// they sometimes work.... if not you need to get to the video head and clean it with a liquid cleaning solution---
one of your tapes may have a bad spot on it causing the problem...if you clean it and use the same bad tape again you can cause the same problem again

Check your "tracking" If the tape played fine in the old machine, then tracking is the answer, provided that the new machine records good.

The DVD won't play,keeps on ejecting

On a unit I checked with this same symptom, removing the top cover allows the unit to stay on and operate normally. There is some sort of sensor at the left middle of the chassis, which, when unblocked by any opaque object, allows the unit to remain on. A temporary fix (not advisable) would be to replace the top cover with a piece of clear plastic or taut saran wrap (no vent holes needed). It's unclear exactly where/what that sensor is from a cursory test. This is a work in progress on someone else's machine that I lack full access to.

What you're describing is common when the center LED has failed / gone out. If you're really good at taking a unit like this apart and putting it back together - and not too bad with a solder stick you could attempt this one yourself... It is a pretty intensive repair but not difficult for a good shop just time consuming. The part isn't too expensive either, just an infared LED... In fact, we've run a bit short on stock once in awhile and bought one of the off the shelf versions from Radio Shack which worked just fine. Good Luck Bill