Check Of Indoor Unit Control Board; Display Board And Remocon Check Of Indoor Unit; Check The Indoor Temperature Sensor - Samsung AQV12F2VE Service Manual

5-3-1 (A) Check of indoor unit control board
Unplug the power cord and plug it after 5 seconds.
Open the grille of indoor unit and press the on/off switch located inside to operate the air con-
d i t i o n e r.
•If the air conditioner operates, check the remocon and indoor unit display board .
•If the air conditioner does not operate, check according to the sequence of the followings:
Check sequence of indoor unit control board
Step 1 : Check whether two wires of power cord (Sky-blue, brown) are connected correctly to the
c o n t rol board .
•Sky -blue : connected to TB71
• B rown : connected to #4 terminal of RY 7 1 .
(If it is connected to #3 of RY71, the power is not supplied)
Step 2: Check whether the wire connected to the terminal block is connected correctly to the
c o n t rol board .
•Sky -blue : connected to TB72
• B rown : connected to #3 terminal of RY 7 1 .
•Black : Connected to CN75
Step 3 : Check whether the fuse (F701) on the control board is normal. (3.15 [A]/250[V])
• If the fuse is broken, replace it with the new one.
Step 4 : check the output of transformer on the control board (TN71).
• Input power AC 240V, 50 Hz—-IC 01 output: DC 12V
5-3-2 (B)(C) Display board and remocon check of indoor unit
Check whether the connection wire of Display board is correctly connected to CN92 connector.
Check the voltage of remocon battery. - the voltage of one battery shall be higher than about 1.4
V, and then the remocon operates normally.
Check whether the neon sign is on and the 3 wave long fluorescent lamp is on around the
indoor unit. - After putting all the lamps of the indoor out and then operates it by remocon. If it
operates with the remocon, it is the abnormality due to the interference from the lights of lamps.
( A i rcon unit is normal).
5-3-3 (D)(E) Check the indoor temperature sensor and indoor heat exchanger temperature sensor.
Take out the thermistor connected to the connector (CN41) of control board of indoor unit and
m e a s u re the resistance between two wires and if it is same as follows: it is normal but if not,
replace it.
Ambient temperature
(°C)
Resistance of
thermistor [KΩ]
Samsung Electronics
IC 02 output : DC 5V
20°C 25°C
15°C
14.68 12.09 10
Take care .
30°C 35°C 40°C
6.94 5.83
8.31
Troubleshooting
The error of data of
within 1%.
5-5