My brother in law was asking me the other day about a sound fault on his tv. I haven't had time to go round to his house and have a look. As far as I know the set is a Samsung plasma which is about 9 years old. I don't know the model number. From what he describes the fault on the sound comprises of crackling noise when the set is switched on from cold. The audio fault seems to clear after the set has been on for about ten minutes. The picture is not affected at all and is absolutely fine. I was wondering whether the fault may be down to failing capacitors on the power supply board. Maybe Nigel or any of our other experts could shed some light on the problem. Any ideas would be appreciated.
Samsung tv audio fault.
Failing capacitors can certainly give rise to noises on the audio stage. Though it might not be the power supply, it could be the audio amplifier stage itself.
And of course it could be some other component either in the power supply (eg a voltage regulator IC) or the audio stage causing the problem. Can often be a real pig tracking down faults like this.
Depending on how skilled you are with screwdriver and soldering iron changing a dead or nearly dead capacitor is not that difficult. Fault finding other components can be a bit more difficult as sometimes there is no obvious visible evidence of the problem like a bulging or leaking electrolytic capacitor.
If it is something more complex than a simple capacitor swap out you may run into problems with spare parts depending on what is actually faulty.
And of course it could be some other component either in the power supply (eg a voltage regulator IC) or the audio stage causing the problem. Can often be a real pig tracking down faults like this.
Depending on how skilled you are with screwdriver and soldering iron changing a dead or nearly dead capacitor is not that difficult. Fault finding other components can be a bit more difficult as sometimes there is no obvious visible evidence of the problem like a bulging or leaking electrolytic capacitor.
If it is something more complex than a simple capacitor swap out you may run into problems with spare parts depending on what is actually faulty.
Originally Posted by chrisjr:
“Failing capacitors can certainly give rise to noises on the audio stage. Though it might not be the power supply, it could be the audio amplifier stage itself.
And of course it could be some other component either in the power supply (eg a voltage regulator IC) or the audio stage causing the problem. Can often be a real pig tracking down faults like this.
Depending on how skilled you are with screwdriver and soldering iron changing a dead or nearly dead capacitor is not that difficult. Fault finding other components can be a bit more difficult as sometimes there is no obvious visible evidence of the problem like a bulging or leaking electrolytic capacitor.
If it is something more complex than a simple capacitor swap out you may run into problems with spare parts depending on what is actually faulty.”
“Failing capacitors can certainly give rise to noises on the audio stage. Though it might not be the power supply, it could be the audio amplifier stage itself.
And of course it could be some other component either in the power supply (eg a voltage regulator IC) or the audio stage causing the problem. Can often be a real pig tracking down faults like this.
Depending on how skilled you are with screwdriver and soldering iron changing a dead or nearly dead capacitor is not that difficult. Fault finding other components can be a bit more difficult as sometimes there is no obvious visible evidence of the problem like a bulging or leaking electrolytic capacitor.
If it is something more complex than a simple capacitor swap out you may run into problems with spare parts depending on what is actually faulty.”
Many thanks, Chris. I have changed many capacitors over the years. I know some manufacturers were particularly prone to use poor quality capacitors such as Capxon. As you say some faults can be extremely difficult to track down.
Originally Posted by leslie123:
“Many thanks, Chris. I have changed many capacitors over the years. I know some manufacturers were particularly prone to use poor quality capacitors such as Capxon. As you say some faults can be extremely difficult to track down.”
“Many thanks, Chris. I have changed many capacitors over the years. I know some manufacturers were particularly prone to use poor quality capacitors such as Capxon. As you say some faults can be extremely difficult to track down.”
Samsung certainly gained something of a reputation for using dodgy capacitors. Not that they were/are the only offenders
The only slight note of caution I have is that the fault clears up shortly after switching on. usually with dodgy capacitors or similar the fault is present all the time. That just makes me wonder if some other component is to blame.
