Hi Jorge, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, the described symptom almost always point to an internal hardware issue. More particularly, potential suspects after a review of the repair/Service Manual are:
All of the above would require that the unit be opened up for visual inspection, voltage/continuity/resistance checks, confirm faults and effect repairs.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?