5 blinks is an error code for 5Volts malfunction
either on the P board
(power supply) or the A board
1 blink is an error code for A board
(no communication between the system CPU
and panel CPU
Since you've got 2 error code which are both related to A board, I've suspected that the A board is already faulty but you have to confirm it to isolate the P board from fault.
You have to check the 5 volts output of the power supply using the multimeter
set in DC voltage measurement. Measure the output of the power supply board through connector P7. If you are getting 5volts on that connector you have to replaced the A board to resolve the issue. If there's no 5 volts output then the P board is faulty.
Faulty electrolytic capacitor can drop
the output voltage. Let say you are only get 3 volts or less on the 5volts line, then suspect faulty filter electrolytic capacitor. Most of the time it has a physical indication of fault like bulged/dome
at the top and can be easily identify through visual inspection like in the sample picture below.
<<< with dome at the top
If the 5volts line dropped its voltage, you have to disconnect the load and then re-measure it (do it very quick, don't let it turn on for a long time without the load). If the 5 volts line normalize after disconnecting the load (A board) then the fault is on the A board and not on the P board. If the 5 volts line still not intact after disconnecting the load, then the fault is on the P board (5volts line).
I've provided a link below for the suspected boards.A board (Main Board)P board (Power supply board)
Note : before ordering online, double check the part no. of your board that is printed on the white sticker on the board itself to ensure you will get the exact replacement. There's some instances that the manufacturer used different version of the board even on the same model no.
Please let me know if you need further assistance.
Ratings and feedback are highly appreciated.
Hope I helped you.
Have a nice day!