Samsung HT-Z410, Service Manual

Page: 42 / 108

4-20 Samsung Electronics
Troubleshooting
4-2 Measures to be taken when the Protection Circuit operates
4-2-1 Operation of Power Block Protection Circuit
The Condition of Power Protection Active.
1. Voltage of SMPS’s PVDD (+35V, J3) is higher or lower than Standards.
Normal Condition Voltage Range: PVDD (+35V, J3): about 35V
2. Over-current occurs to AMP IC. (Over-output or Output short)
3. AMP IC’s temperature exceed 150°C.
4. No supply voltage on GATE DRIVER.
Z410/510
SMPS
Part
Location
Pin No.
Protection Circuit Operation
Remark
Open Short
CN3
+8V
X
-
+5V
X

+3.3V
X X
+5.6V
X X
-2
X X
J3
PVDD (about 35V)
 
-12V
X X
+12V
X

<Table 4-1>
4-2-2 Power Protection
1. OTW: Active, IC’s inner temperature exceeds over 150°C.
(Under 2.7V, Protection Circuit wills Active)
2. TAS5352 3
TH
PIN: Shout down
(Under 2.7V, Protection Circuit wills Active)
1
2
<Fig. 4-9>