sony SA-CT60BT soundbar problem

[bob_rich]

Hi

I have repaired the unit once before and it had the swollen capacitor problem changed it out for new and all was OK but it failed again. Opened up and it had another swollen capacitor but this time canning it out still no good.

the unit is totally unresponsive to the controller ( which seems to send a signal OK) after digging around I found theta the capacitor I changed the second time has no volts across it. Further checks suggested the power supply ( based SSC620 chip) is either in s standby type of mode. Two other supplies read around 29V and 3.5V.

welcome any further tips or ideas. have wondered about changing out all the capacitors. Also there is a small circuit board on the right hand side looking from rear with cover off fed with a red and white lead--any idea what this does.

any ideas would be most welcome

bob

[sam_sam_sam]

Re: sony SA-CT60BT soundbar problem

Please post some pictures of the boards in it

[Retro-Hipster]

Re: sony SA-CT60BT soundbar problem

Oh, also, on that capacitor where there are 0 volts if you do a continuity test from one lead to the other do you have a low ohms link/short? Honestly, if failed capacitors are a theme with this unit it would probably be worth checking all of the tank capacitors at least. (Anything remotely high capacitance)

If you have an ESR meter that would help. If not, having an oscilloscope + signal generator can be even better for testing stuff in circuit quickly. It also can help you distinguish between a super low ESR and a short. (Putting things in DC coupling and keeping the in-circuit test current low, like 250mv with 100-250MHz will help you distinguish between a short vs a low esr.)

Note: Unless you are intimately familiar with a circuit/know where parallel capacitors are, it is always better to test out of circuit. Actually, it is just always better, but you get the point. lol