Sony HT-RT4 Service Manual page 18

HT-RT4/RT40
4. Power is not turned on
Power is not turned on.
Yes
Reprogram serial flash IC2000 and
check power on.
No
The voltage of the following is 20V/32V
SWITCHING REGULATOR:
Connector (CN101) pin 2 to 4 and 8.
Yes
Check MAIN board (RT4) / EG4 MAIN
board (RT40) IC3205 pin 1 is 12V.
Yes
Check MAIN board (RT4) / EG4 MAIN
board (RT40) connector (CN2006) pin
14 is 12V.
Yes
Replace complete MAIN board (RT4) /
EG4 MAIN board (RT40).
18
No
Replace the SWITCHING REGULATOR.
No
Replace IC3201 on MAIN board (RT4) / EG4
MAIN board (RT40).
No
Replace transistor (Q3208) on MAIN
board (RT4) / EG4 MAIN board (RT40).