Samsung AS12HPCN Service Manual page 60

Troubleshooting
12-2-5 When the remote control is not receiving
1. Check if the connector was normally assembled.
2. Put the set in operation and check the voltage of No. 15(+) and No. 16(-) of the main PCB CN91 while operating the
remote control. When the voltage descends below 3V, the assembly module PCB is normal and the main PCB is poor.
Then replace the main PCB.
3. Replace the assembly display PCB because the module PCB is poor if the voltage between No. 15~16 of CN91
maintains 5V after the remote control starts operation.
12-5 Samsung Electronics