PS pca may have cold solder joint Loose power supply cable, bad connection. Clamp mod consist of C543, R551, R550 and D523. Most of the later digital p.c.a's and Celebrity receivers already have it build in. VCII channels have crackle in audio or VCII will not engage Turn Insert Sync in Menu 9 to Off to see if the sync is engaging and causing the problem. Picture may still be shaky.
Most likely cause is bad caps.
C607 3.3uF on digital board. Phone line plugged into the Data Link input on the back of the Monterey may cause the VCO voltage to be drawn down so that the tuner could not tune below a certain channel. Bad LNB's can also cause a similar problem. Back to top Video rolls horizontally Check to see if turning off the SYNC in menu 9 will make the video on non VCII channels stabilize. And the graphics are still stable, replace the capacitors C586, C549, C546.