SAMSUNG FRENCH DOOR REFRIGERATOR - Model RF26J7500SR/AA

[kryto8823]

Can someone tell me what are the 4 circuit boards behind this fridge ?  The big one on top is the "main control board", the bottom-right says "inverter" on it. There are 2 small boards bottom left side. What are they ? Is one a "defrost control board" ? Maybe one is a "power supply board" ?

thanks

[Vance R]

4 hours ago, kryto8823 said:

What are they ?

Top board is the EMI filter or "noise filter", the bottom is the power supply board.

The defrost heaters are controlled by the main board, CN70 pin 9 is for the freezer, pin 7 is for the fresh food.

[kryto8823]

Thanks Vance, that is good info. I was hoping to be able to use my meter to test if 120v is being sent out from the board to the defrost heaters. The fridge is running fine now with a secondary heater (Supco SH502) installed at top of fridge evaporator near fan. (where these fridges always ice up) 

I'd like to be able to "see" the 120v being applied to heater in fridge by checking at main board.

You mentioned two pins, I guess black lead to a ground pin and the red lead to the pins you mentioned ?  I found CN70 but the 7 & 9 are not shown. Maybe you mean count connector pins from left to right? Looks like the yellow & white wires would be 7 & 9 pins. 

 

[Vance R]

In this case right to left, white is pin 7, brown is pin 9.  Pin 7 is the line for the fresh food evap, pin 9 is line for the freezer evap. For neutral use CN 72 pin 3, black wire for neutral.