Usually when this happens, the control itself has failed. Repair requires replacing the entire top operation assembly in which the zoom is contained. I wish that there was another solution, but I have replaced many of these for this problem.
If you have an interest in how to obtain the part let me know.
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Possible that the zoom switch is short or struck in action where by the zoom has gone to the extreme end. Wriggle the switch after the cam is switched off and see if it returns. If not the unit must be opened to check for the switch failure or possible motor failure, drive circuit or a mechanical jamming.
This does require disassembly to remedy the problem. There are various possible fixes.
The most prevelant I have seen is cold solder connections of the board connector for the fpc cable from the top operation switch block ass'y. All you need is someone who can handle this task, like a professional. The controls that you are experiencing problems with are all linked with one cable and connector. One bad solder joint can cause serveral operation faults.
It is not very easy to say few lines to tutor ,but learn to use only by experience.Put the battery on for charging.Once fully charged slide the power switch to camera.Open the lens cap ,open the view finder display.Now you can see the picture on your screen.Set the camera to auto focus.show the camera to a white screen so as to white balance the camera.Now point at an object and do a trial Zooming using the auto zoom with your finger.The image will come closer and you can draw it to white screen.Having an object in view on the white screen,press the record button.Slowly move the zoom forward to get the right frame of the object.Press reccording button once again to stop.Repeat the process on different scenes.
Now shift the mode switch to play and rewind and play the reccorded portion.Practice.
There is control switch block that has zoom/wide switch along with play, rewind, forward, stop, pause buttons and this switch block flip up and down while ejecting/ load tape in camcorder, this will be replaced as zoom/wide switch got defective and sending continues command of zoom to system control chip. Let me know if you need part number of switch block control for DCR-TRV120
You need to remove the memory card from the camcorder and place it into a pc or photo shops computer. This will allow you to view the saved items on the memory card. You can then save these to disc and delete the contents on the card.