Have you checked the fuse?
From Bose Troubleshooting guide:
”AC mains power is connected by the line cord via jack J1. A slow acting fuse F1 is connected between J1 [D7] and the locking primary connector J3 (or J2 or J4) to protect against faults. A Metal Oxide Varistor (MOV) VR1 is placed after the fuse and across the line. It is used to protect against lightning strikes and other line transients. “
I did some research and it sounds like bad solder joints are common in this unit, So I would look for any cracked joints, cold solder, etc. while you are in there inspecting the fuse.
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crwdns2944067:05crwdne2944067:0
Hi Puneet Rawat
What had you tried?
What issues you are having now?
like able to turn on but no sound?
crwdns2934271:0crwdnd2934271:0 Augustine crwdne2934271:0
Mine is well soldered but still no sound to the sub woofer except the smaller speakers only. What could be the problem? i have changed the TDA7396 twice now but no joy
crwdns2934271:0crwdnd2934271:0 Muchatarana Nyemba crwdne2934271:0
Hi Puneet,
did you manage to fix this? I’ve got exactly the same problem. I tested all resistors and capacitors up / from TDA7396 and they seem to be fine. I also replaced the TDA7396 as you did with no sucess. I’m really lost.
Felipe
crwdns2934271:0crwdnd2934271:0 Felipe crwdne2934271:0
scusate il problema e di un chip siglato A3089G
sapete dove posso trovarlo?
crwdns2934271:0crwdnd2934271:0 checco70t crwdne2934271:0
checco70t: How do you arrive to the conclussion that the problem is with that chip? Also, where is this chip located? it's not displayed in the electrical part list in the service manual
crwdns2934271:0crwdnd2934271:0 Felipe crwdne2934271:0