Measures To Be Taken When The Protection Circuit Operates; Operation Of Power Block Protection Circuit; Power Protection - Samsung DA-E750 Service Manual

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.
Part Location
SMPS

4.2.2. Power Protection

The Condition of Power Protection Active.
1) Voltage of SMPS (+5.2 VS) is higher than standards.
Normal Condition Voltage Range : +5.2 VS
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.
Copyright© 1995-2012 SAMSUNG. All rights reserved.
Pin No.
+5.2 VS (2, 3)
+12 V (12)
CN851
PVDD +17.5 V
(10, 11)
PVDD -17.5 V (6, 7)
Protection Circuit Operation
Open Short
○ ○
○ ○
○ ○
○ ○
4. Troubleshooting
Remark
4-5