Ibiza Sound Combo210 burning TDA8950 chips
Hi there.
This is my first post in this forum, hope that someone more experienced than me can help with my situation.
I have one Ibiza Sound Combo210 on hands that works with a TDA8950 based amplifier.
When I opened it I could see that it was repaired before. There were two bodged regular resistors in place of two SMDs. One was visibly burned. I measured them and they are 10Ohms (agrees with the TDA8950 datasheet) that connect to VDDA and VSSA. The one that was visibly burned was the VSSA one. I replaced the one that was not burned with an SMD one like it was originally and put the removed unburned it in place of the burned one.
I replaced the TDA chip and the system worked for a few hours and then burned again. The resistor is again burn looking and the resistance dropped about 3Ohms (it didn't go directly short or open).
I measured the input voltage and it is about - 37.5 and + 37.5 Volts.
I don't know how hot this amplifier is supposed to run, but I measured up to about 80ºC at some spots of the board being the two resistors close to the big capacitors de hotspot at about more than 10ºC compared with temperature of the TDA chip zone. The power supply also runs very hot at over 100ºC.
I'm attaching pictures of the board for you to check.
Any help would be sincerely appreciated.
Cheers.
Hi there.
This is my first post in this forum, hope that someone more experienced than me can help with my situation.
I have one Ibiza Sound Combo210 on hands that works with a TDA8950 based amplifier.
When I opened it I could see that it was repaired before. There were two bodged regular resistors in place of two SMDs. One was visibly burned. I measured them and they are 10Ohms (agrees with the TDA8950 datasheet) that connect to VDDA and VSSA. The one that was visibly burned was the VSSA one. I replaced the one that was not burned with an SMD one like it was originally and put the removed unburned it in place of the burned one.
I replaced the TDA chip and the system worked for a few hours and then burned again. The resistor is again burn looking and the resistance dropped about 3Ohms (it didn't go directly short or open).
I measured the input voltage and it is about - 37.5 and + 37.5 Volts.
I don't know how hot this amplifier is supposed to run, but I measured up to about 80ºC at some spots of the board being the two resistors close to the big capacitors de hotspot at about more than 10ºC compared with temperature of the TDA chip zone. The power supply also runs very hot at over 100ºC.
I'm attaching pictures of the board for you to check.
Any help would be sincerely appreciated.
Cheers.
Attachments
Last edited: