Sony HT-RT3 Service Manual page 17

4. Power is not turned on
Power is not turned on.
Yes
The voltage of the following is 20V/32V
SWITCHING REGULATOR:
Connector (CN101) pin 2 to 4 and 8.
Yes
Check MAIN board IC3205 pin 1 is 12V.
Yes
Check MAIN board connector (CN2006)
pin 14 is 12V.
Yes
Replace complete MAIN board.
UFOELK - 2/21/2018 5:23 PM
No
Replace the SWITCHING REGULATOR.
No
Replace IC3201 on MAIN board.
No
Replace transistor (Q3208) on MAIN board.
HT-RT3
Ver. 1.4
17