Window ac not working

[remunguia1]

Hey guys, I'm working on a frigidaire window a/c and I'm trying to get the voltage to the display board. From the main board to display does not say on wiring diagram. No service manual either. Any suggestions?

[johntech]

Need to post model number.

[remunguia1]

Yes it's FRA15mt1 it's a 15,000 btu and when I plug it in it'll beep and display lights up and then goes dead. Won't turn on. 

[remunguia1]

Any manuals on this or what's the voltage to display? Dc or Ac?

[remunguia1]

On 6/4/2017 at 5:57 PM, remunguia1 said:

Yes it's FRA15mt1 it's a 15,000 btu and when I plug it in it'll beep and display lights up and then goes dead. Won't turn on. 

Sorry it's FRA156mt112! Service manual or what voltage should come from main board to display board? What pins? Thank you!

[remunguia1]

On 6/4/2017 at 6:56 AM, johntech said:

Need to post model number.

Fra155mt112

[remunguia1]

Just now, remunguia1 said:

Fra156mt112

 

[johntech]

The wire diagram for this thing is a joke. Looks like cn1 goes from the main board to the display board. If it were mine I would confirm that you have 120vac at the main board between ry7 3 and p8. Next I would check for 5-12vdc to the display board on cn1. If I am getting stable power to the display board and it is not lighting up then I would replace the display board. If I did not have power to the display board or it quickly disappeared I would want to check the transformer connected to cn5 and cn6 but they do not give any details on the windings so I would check voltages going in and out. 

 

Many someone else who has more experience on this model or access to better info will chime in.

Edited June 6, 2017 by johntech

[johntech]

[remunguia1]

Yes I have that but what voltage should the display board have from the main control board? DC? 

[remunguia1]

3 hours ago, johntech said:

The wire diagram for this thing is a joke. Looks like cn1 goes from the main board to the display board. If it were mine I would confirm that you have 120vac at the main board between ry7 3 and p8. Next I would check for 5-12vdc to the display board on cn1. If I am getting stable power to the display board and it is not lighting up then I would replace the display board. If I did not have power to the display board or it quickly disappeared I would want to check the transformer connected to cn5 and cn6 but they do not give any details on the windings so I would check voltages going in and out. 

 

Many someone else who has more experience on this model or access to better info will chime in.

Yeah I know, it's frustrating when you can't get the details. Frigidaire wont release any info unless you pay for service!