Re:Ge Fridge - Main board burned up or what?

these two entries are facts from G.E. no guess or assumption.hope this is some help

The 70VDC may not be abnormal. Quite a lot of power supplies for boards may have a heatsink which is at a high voltage potential depending on where the reference common point was used.

Any voltage over 48 VDC is potentially lethal.

It sounds like this fridge may have a defrost circuitry problem. Trace back the compressor power to a relay to see if the relay is providing the compressor line voltage.

i applied fresh solder to the relay. it looks like this may have solved the problem for now.

I thought the 70vdc was an error.

zenith rgb board have 125vdc on collector for 10yrs to drive picture tube very common levels.

If solder on the relay works:

The temp provided by soldering my have loosen a stuck relay contact. Continue to monitor the relay if you have issues.

The 70 VDC is not abnormal because if the negative DC supply is not tied to chassis ground it will be floating when referenced to ground. Some power supplies can float to high voltages above ground and this is completely normal.

this happens in alot appliances where gound is not nessary chassic ground. if its working why are you worried about this 70v issue no one is in contact with it. if it aint broke dont fix it.put it together and forget it. it will run for next 5yrs like that ammana is bad about grounds above chassic. your going to worry your self to death about it for get.i would had change the board and for get about it.you didnt do that ????

looked at a print looks like compressor fans start winding are 70v so they would be above ground

sunday in my shop i worked on a rear projection tv 52 inch horizontal output transistor collector runs at 162 vdc steady.vedo drivers on each crt boards x3 runs 146vdc steady so with that said high voltage on collectors is not uncommon.my maytag washer is digital collector for motor start up 150vdc .so your 70v is nothing .engineer was paid 60,000 a yr. to design that so let it go