Samsung HW-C450 - Measures to be Taken When the Protection Circuit Operates

Samsung Electronics 4-15
Troubleshooting
4-2 Measures to be taken when the Protection Circuit operates
4-2-1 Operation of Power Block Protection Circuit
Protection Circuit operates when power problem occurs in the SMPS.
SMPS
Part
Location
Pin No.
Protection Circuit Operation
Remark
Open Short
CN2
D5V (5, 6)
 
A5V (7)
 
-A5V (9)
 
-25V (11, 12)
 
+25V (15, 16)
 
<Table 4-1>
4-2-2 Power Protection
The Condition of Power Protection Active.
1. Voltage of SMPS’s +, - PVDD (+25V, -25V) is higher or lower than standards.
Normal Condition Voltage Range: PVDD (+25V, -25V): about +25V, -25V
2. Over-current occurs to FET. (Over-output or Output short)
3. FET’s temperature exceed 150°C.
4. No supply voltage on GATE DRIVER.