Owner says this set was going OK when stored away for a year or so then when put back into service would not tune stations in properly. The tuner only gets to around 35 - 37% signal strength on known very good antenna input. I checked for anything obvious such as connection and dry joints and also checked PSU outputs which are all as they should be. As the reception is both broken picture and erratic sound it does seem to be purely a tuner problem so I looked for voltages in that area and measured 5v with nothing else showing. Don't know what should be there as my first experience of a tuner was with a "cats whisker" and last look at one was with interlaced fins controlled by a knob!!
-
-
Re: Sanyo LCD-32E30A weak tuner
OK managed to find a schematic showing tuner in detail and 5v is correct feed. Now to check associated components and would appreciate any comment on most likely cause of problem. -
Comment
-
Re: Sanyo LCD-32E30A weak tuner
As I sometimes find the schematics can be misleading. On this one I note both pin2 and the last pin are not connected in the set, otherwise I have 5v where it should be but no real idea on following output signal. All earths are good and both resistors in tuner read OK. Pic of tuner section of board posted herewith.Attached FilesComment
-
-
Re: Sanyo LCD-32E30A weak tuner
https://www.youtube.com/watch?v=FdS239NxIOU your tuner seems to resemble this one, fixed with some added solder.Comment
-
Re: Sanyo LCD-32E30A weak tuner
Now certain fault is in tuner itself as I found a couple of old boards with similar tuners and measured continuity from connector centre pin to pin1 on board but not so on this set. Problem is as can be seen in pic that even if I can get the tuner out OK there is a heap of stuff on underside of its board and unless something simple shows I will be no further ahead as I don't have same configuration in tuners I have as spare. Apart from this its a 9 year old set and I sell these going for $50/60.Attached FilesComment
-
-
Re: Sanyo LCD-32E30A weak tuner
https://www.youtube.com/watch?v=SeKq9YDZMUc replacing tuner, didnt see anyone repairing one other than soldering and repairing connector.Comment
-
Re: Sanyo LCD-32E30A weak tuner
Try bypassing the connector and soldering a piece of coax directly to the proper tuner location. Maybe the inside of the connector itself is too dirty for some reason.Comment
-
Re: Sanyo LCD-32E30A weak tuner
NI had cleaned inside connector as best I could but no change so today turned tuner itself side on to board by unsoldering the 4 external locating pins. This allowed me to connect to rf input on underside of tuner board but with same result of broken picture and choppy sound. Have now ordered replacement tuner from China as no joy at all when searching for a main board.Comment
Comment