Samsung CL21B501HLMXZS Service Manual page 12

7. Basic Troubleshooting: Diagnosis of LED on the Front Panel
●: Light is On
◑: Light is Blinking
○: Light is Off
Power
○
●
○→◑→●
8. Troubleshooting by the Checksum
■ Diagnosis of trouble by the checksum is neither reliable nor convenient.
You can only use the checksume of the current direct-view TV to determine whether the software is corrupted or not.
The Checksum value is determined according to the version of the software loaded on the set.
Therefore, you can determine whether the software has been properly downloaded, if you know the correct checksum for that
version of the software.
You can check the checksum according in the following order.
Factory Mode → Checksum → Enter → Output Checksum (e.g. 0xab2b)
■ Checksum Examples
T-SIXNSAM -1000.0 Checksum = XXXX
Samsung Electronics
This happens when the TV have turned on or the power cord is disconnected.
This happens when the power cord is connected.
The LED blinks, while the unit is starting up or the unit is turning off.
LED
Description
Troubleshooting
4-5