A w s 6 5513. What would cause the picture to roll?

In the old days there was a control at the back of every tv labelled "vertical hold" that needed adjustment when the picture rolled. As tv sets became better that control was at first moved inside the cabinet and then finally deleted.

The vertical hold controlled the amount of synchronising signal (that is extracted from the signal received from the antenna) reached the frame oscillator. Today's electronics are so stable the vertical and horizontal synchronisation is automatic so while sometimes a rolling picture can be caused by a bad signal it almost invariably caused by an internal electronic fault needing the attention of an engineer.

The picture rolling up and down is caused by the vertical oscillator running off frequency. Usually caused by a Capicator that has burnt out and started leaking and causing the frequency to be off. Static sounds like weak signal, however the vertical oscillator could be corrupting the picture. If you are not a trained TV Technician don't try to fix it yourself. There's a lot of junk back there and knowing where the vertical oscillator section is located and which capacitor is bad will require a tech manual or a 'Sam's Photofacts' to hunt it down. dhgill1949

Picture roll is caused by the frame rate being out of sync with the play back device. If the tape was recorded at say 25 f/m and is being played back at 26f/m. If you can, adjust the frame rate until the picture stands still.

this fault is caused by defective electrolytic capacitors in the vertical deflection circuits, they need to be changed out, do this before it causes more problems, there are no adjustments for this anymore.

A rolling picture or loss of vertical sync can be caused by several components including a bad signal board or jack panel assy. You will not be able to resolve this yourself. contact a Mitsubishi authorized service center.

michtech

If the picture rolls while both on cable as well as when you playback a tape or DVD, it could be caused by a bad filter capacitor in the power supply or vertical deflection circuits. If it only rolls while trying to view a picture from a cable/satellite box, then that component is likely at fault.

I have seen this many times. There is a 9 volt regulator on the small signal board that causes this. The regulator goes bad and the 9 volts starts dropping, especially at start-up when the regulator is cold. If the voltage is below 8 volts then the picture gets dark and the vertical becomes unstable, with the picture squeezing down and/or rolling. As the regulator warms up the voltage starts rising back towards 9 volts and the symptoms start clearing up. There are 3 regulators in a row on the board and the regulator in the middle is always the bad one. Replacing that regulator should cure your problems but it should be replaced by someone experienced in servicing Mitsubishi projection TV's because pulling the chassis out is quite tricky.

Does you set have PIP (picture in picture)? If it does then the PIP module has a bunch of capacitors that have gone bad (dried out and leaked) causing you to loose vertical sync. Vertical synchronization is what locks your picture keeping it from rolling. Even if you don't have PIP then still you have a vertical sync problem. The set would have to be checked by a tech to find exactly what's happening. Stargazer

is this a horizontal black line going up or down? if yes, this sympton is caused by a trouble in the integrated circuit or in the vertical oscillator circuit. this symptons has 2 variations. one is the intermittent rolling of the picture. this referred to as the "loose vertical hold" the other variations is the continuous upward or downward rolling of the picture

Possible causes: the sync signal head is not recording, there is a mismatch between the capstan motor speed and the video head speed, or one of the sync circuits has a fault. Typically, if the picture rolls up or down, it's a vertical sync problem. A horizontal sync fault or tracking mismatch will cause the picture to tear sideways.

Try cleaning the sync head (one of two heads separate from the video head drum; the other is the audio track head), but don't be surprised if doesn't solve the problem.