The major SMD capacitors have been changed, and the main circuit board cleaned of acid. I have checked the resistance values coming off the switches, and they are fine, so I am not dealing with a stuck control button. This is looking to be a logic problem on the main PCB. I have a feeling that this is probably a common issue.
This is a reach, but is the button pusher , the plastic piece that pushes the tact switch worn down and not actuating the switch? Have you tried a ceramic driver with the case open and actuating the physical switch instead of the button on the case to verify.
My razer mouse had the same issue , it took me a week poking around to realize the button pusher was worn. Super glued a piece of rubber to the worn pusher and its working fine to this day
Testimonial: "Yes, a good suggestion but I've had a meter across the pins, and the buttons are responding fine."
SOURCE: Coleman furnace blower runs continuously
You should be seeing 120 volts to the igniter. Anything less requires either a replacement of the transformer, start relay or control module.
SOURCE: Samsung 50" Plasma TV no response to remote ctrl & buttons
No need to exchange the Logic Board.
Need to exchange the IR modue.
SOURCE: Power but no picture or sound
Hi, could be the main board but first you need to look for swollen capacitors on the power supply, here is the process:
, the solution to fixing your TV is most likely the power supply, if you are wanting to repair it yourself and can solder, it is most likely going to need (2) 1200 or 2200mf at 35volts electrolitic Capacitors, or you can replace the whole power supply. The back is held on with a few screws around the back and edge and then you need to pop the edges loose starting at the bottom side corners. once the back is removed the power supply is mounted inside a rectangle metal shield , remove the screws around it and the little ones going into the jack/input section (using a short philips there), there is a wire running from a circuit board to the USB input be careful not to pull on it, unplug its wire from the CBA. then look at the power supply (top center board) the cylinder looking capacitors that are bad will be bulged on top, usually there are two 2200mfd at 10 or 25volts. changing them should get it working. A repair shop will charge you around $250 for this job, FYI
hope this helps
thanks
Eric
I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771
SOURCE: Hello!Sony SDM-HS73 power-inverter problem
At this point you may have bad transformers, bad tuning cap, you need to check the frequency of the inverter oscillator to see if both of them are running at the same frequency, the bad one may not be. The Inverter/power supply is not made by SONY, Powernet makes the board. Please see what went wrong with the one I fixed.
http://s807.photobucket.com/albums/yy352/budm/Sony%20SDM-HS73/
One thing to keep in mind, when the board turn into carbon (blacken), it will conduct. The circuits operate at high voltage and high frequency.
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