Incorrect ac charger, digital camera doesn't work.

115 ac volts at idle seems very high to me. if all 3 coils are putting out the same voltage I'd say its ok.

It sounds like a defective/incorrect AC-to-DC adapter may have caused your problem. These adapter come with different output voltages, AC or DC output and different amperage ratings. AC-to-DC adapters list the polarity of the DC voltage as it relates to the DC power plug and you must match both the devices voltage and power requirements. As for the amp...not working on batteries either, I would suspect output transistors or IC.

The battery is most probably defect. and then,
The manual says:


Battery is exhausted.
When connecting to an electrical outlet using a Charging AC Adapter, the camera cannot be turned on.

• Confirm all connections.
  
• Off is selected for Charge by computer in the setup menu.
  
• When charging by connecting the camera to a computer, battery charging stops when the camera is turned off.
  
• When charging by connecting the camera to a computer, battery charging stops if the computer is suspended (sleeping), and the camera may turn off.
  
• Depending upon computer specifications, settings, and status, it may be impossible to charge the battery inserted into the camera via computer connection.
  

So even when you think the battery is charged, it still can be empty. When a rechargeable battery is old, or not often used, it can lose its capacity, not being able to power the equipment it was meant for correctly.
To make sure your battery is good, you could try to check the voltage with a multi meter. The voltage should be slightly higher than the 3,6 Volt that is printed on the battery. like 3,8 Volt, when measured. if it is just a fraction lower than the 3,6 is is not fully charged and it will be much lower when put in a camera, after switching on the camera. When you measure 2,4 Volt, 1,2 Volt or even nothing you can be sure the battery is dead.

Best option then, would be to order a new battery. But if you know someone with a camera that has the same battery that works, ask if you can check your camera still works with a battery that is ok. because when in a rear situation it is you camera that is defective, you can save the mont for a new battery and look out for a new camera, because the batteries are not cheap.

When the ac acts up,test voltage at the ac clutch,if there is voltage(12 volts to 14)then the clutch is the problem,also,try and wiggle the low pressure switch ,to see if it tries to come back on,,,have some one put some ac gauges on the ac system and let the ac run,and watch to see if the low side falls down to 25 psi or lower,if it does,then the orifice tube is stopping up.If this was at all helpful,please rate,thank you.

It could be a flame sensor, which is a thermal switch located inside the cabinet on top of the cavity (there may be two of them). One power lead should go to the fuse, the other would go to the flame sensor. Remove the flame sensor and check for continuity. If it shows open (infinite resistance), put it in the coldest part of your freezer for a few minutes, then retest. If it now reads continuity (zero resistance), replace it, put the appliance back together, and see if it works.

Have you contacted Sony ? Mind you, they're only £30 on Ebay
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiaqJSyvufSAhXBwBQKHd_5A88QFggoMAI&url=https%3A%2F%2Fwww.sony.co.uk%2Fsupport%2Fen%2Fproduct%2FDSC-S75&usg=AFQjCNGtDo46s1BirFFcHHl2gDk_CjimYw&sig2=gP0XAe9rcDk9JdLADkI6ig

There is a very very easy way to fix this problem..

This can happen if...
1.) If the battery dies when the camera lens is open (and you close it manually, or sometimes, even if you dont.)
2.) If you used a AC adapter with too much voltage or not enough. (this can happen even if you used the correct voltage, refrain from using AC adapters at all)
... all together its ethier a voltage or camera lens problem...

TIPS:
1.)NEVER PUSH THE LENS IN AFTER CAMERA DIES, BUY A NEW BATTERY IMMEDIATLY AND TURN IT BACK ON, CLOSING THE LENS!

2.)NEVER USE AN AC ADAPTER, USE A RECHARGEABLE BATTERY OR A REGULAR BATTERY!

..to fix this...

Do as i say..

1.) Remove battery
2.) Remove front plate (screw driver may be needed)
3.) Check all gears, make sure they are correctly fitted in place)
4.) Move the gear manually to make the lens come out.
5.) keep it out, put the front plate back together.
6.) reinsert the battery, turn it on.


or...
1.) Remove the battery.
2.) Wait about 6-8 hours.
3.) Reinsert the battery.

or...
1.) Remove the battery.
2.) Try hooking it up through AC adapter, put correct voltage.
3.) Try turning it on.
4.) Remove AC adapter, reinsert battery.
5.) Turn it on.



Hopefully all this information helped,

This blog post outlines repair procedures for stuck lens covers. An A400 is used as an example. But it should be similar for the A430:

http://camerarepair.blogspot.com/2007/11/repair-of-stuck-lens-covers.html

oh no maybe you used different adaptor some adaptor have reverse polarity. check the adaptor before plugging it..if you using variable voltage set to 3v then adjust also the polarity. the polarity should match the polarity of your camera.