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
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Usually when that happened for me, it meant that one of my small children had also put a foreign object in the slot where the VHS tape goes. Any type of obstruction will cause the VCR to jam and force the television to shut off.
The tape player section has some safety sensors inside that will shutdown the system when there is a problem. The most common cause of this is either a bad belt or "idler". If the tape is not moving or the take up side is not moving, this will happen. This is a simple repair for any shop and should runfrom $5-$25 for parts (belt - idler) plus the local labor rate.
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.
It is not clear whether one DVD or all DVDs play in black and white. If it is only one make sure that the format of the DVD is correct. If it is all DVDs, given that the VHS tape and cable play with color, there could be a problem with the chroma circuit in the unit. This is probably something that a technician would need to diagnose. Good luck.