Hi everyone,
thanks for your support last time (power supply issues)

This time i am facing little different problem, i really hope i will recover my audio system with your support.

I am having Philips Bluetooth soundbar with subwoofer, i cannot open it , all sides are glued and fixed, i also know the subwoofer is perfectly fine i tried it with other device.
The problem is with the circuit or something inside soundbar, which is also a driver for the woofer.

while connecting soundbar with computer by mistake i took the video lead from my computer and pluged into the woofer port of soundbar in place of lead from subwoofer (they both were yellow, so that was a mistake). So i guess soundbar got power from both sides (from computer and from AC supply), however its made to produce power for subwoofer. Something shorted in soundbar it produced "tik" sound and little burning smell.

I opened the circuit for continuity check and its ok. ( its based on F4558 and 2030 five leg ic).

already checked wires and sockets, they are fine.

F4558 ic: there is a continuity in 6th and 7th leg only which is fine as per circuit board.
2030 ic : i found no continuity between legs. rest are some capisitors only.

Can you please help me with what could be the bad part.... which part should i check for replacement.
i AM hobbyist with circuits and want to recover this audio from my own. Please help me.

Thanks in advance

 

Are there any burnt tracks underneath the board?

 

Try changing the TDA2030's

 

Are there any burnt tracks underneath the board?

Hopefully there are no burning spots and sound bar is working fine, only its not providing power for the subwoofer.

 

Try changing the TDA2030's

how to check 2030's ? I checked with multimeter... and found NO continuity between any leg.

 

I said changing them.
You cannot check them with a DMM unless you understand the IC's internal functions

 

Can you confirm these assumptions.
1/ The sounbar contains just 2 speakers. (Left and right.)
2/ The subwoofer box is just a speaker. (There is no electronics in the box.)
3/ it is only a 2 core cable that goes to the subwoofer
4/ When you say 2030 ic you mean a TDA2030
If these assumptions are correct then with your multimeter check the resistance between the outer of the subwoofer socket on the soundbar and the track on the board that joins the positive of one of the large electrolytic capacotors with the negative of the other. Check the resistance between the centre pin of the socket on the soundbar and pin 4 on each of the three TDA2030's Identify them as left middle and right as shown on your picture of the board when yoy post the results.

Les.

 

Can you confirm these assumptions.
1/ The sounbar contains just 2 speakers. (Left and right.)
2/ The subwoofer box is just a speaker. (There is no electronics in the box.)
3/ it is only a 2 core cable that goes to the subwoofer
4/ When you say 2030 ic you mean a TDA2030
If these assumptions are correct then with your multimeter check the resistance between the outer of the subwoofer socket on the soundbar and the track on the board that joins the positive of one of the large electrolytic capacotors with the negative of the other. Check the resistance between the centre pin of the socket on the soundbar and pin 4 on each of the three TDA2030's Identify them as left middle and right as shown on your picture of the board when yoy post the results.


Les.

1) Yes L and R speakers.
2) Yes the woofer box has no electrical box..its just speaker
3) Yes it has only 2 core cable comming out of woofer and connects to woofer port on soundbar
4) Tes its TDA2030

Resistance between Outer part of subwoofer socket on soundbar AND on the track on board where two capacitorsare joining shows...constant rise and went to infinity after 2m ohms.

Resistance between Inner part and 4th pin of TDA2030:
From left to right as on picture
LEFT: 4.1 ohms and 4.0 ohms and stable
MIDDLE: 4.2 ohms and stable
RIGHT: 0.3 ohms and nothing

 

Change the TDA2030 that connects to the woofer.

 

I had made the assumption that the amplifiers were configured with a split power supply so I was expecting the outer of the subwoofer connector to be connected to the junction of the large electrolytic capacitors. (So I was expecting a reading of close to zero ohms.) It looks like there is a capacitor between what i assumed to be the ampifier ground and the outer of the sbwoofer socket. Can you trace the wire from the outer of the subwoofer socket and say where it is connected on the board ? When you say the fourth pin do you mean the one next to the extreme right hand pin or the extreme left hand pin ? (Just to make sure you are numbering the pins the same as the data sheet.) I think the right hand TDA2030 is the subwoofer driver abd I think R!f@@ is correct that this has probably failed but I don't understand why at the moment. I picture of the etch side of the board may help.. If it is a TDA2030 that has failed I found two on ebay for less than £3.00 for the two.

Les.

 

I do this all the time.