Crackling on switch-on, 32PW9631 (GFL2.3 chassis)

[Chris Muriel]

About 3 months ago our 7 year old Philips TV started crackling and farting for a few seconds when taken out of standby ; afterwards, when it settled down, everything was perfectly normal - until the next switch on/ switch off cycle.
The fault has now progressed to the stage where it takes more than a minute to settle down (with blue screen , a quick flash of normal TV and then more blue screen until the selected channel finally appears in stable fashion) .
I have found by experimentation that if I select one of the AV inputs (there are 3 SCARTs) like satellite or cable STB then the TV is fine ; this is why I am assuming it is a tuner (or tuner power supply) fault.
I guess I'll have to take the back off and have a look around.
Before I do this , has anyone come across a similar fault on this chassis (GFL2.30E I believe) ?
I thought at first it might be just a connector making poor contact but, with the ever lengthening settling time, perhaps it's more likely to be a faulty electrolytic capacitor.
I have no circuit diagram or service manual either which doesn't help :-(

I have the usual digital and analogue multimeters, oscilloscope etc. but it would help if I knew what to look for !

Any practical advice would be greatly appreciated

Chris Muriel Manchester.

[JayCee]

Originally Posted by Chris Muriel

About 3 months ago our 7 year old Philips TV started crackling and farting for a few seconds when taken out of standby ; afterwards, when it settled down, everything was perfectly normal - until the next switch on/ switch off cycle.
The fault has now progressed to the stage where it takes more than a minute to settle down (with blue screen , a quick flash of normal TV and then more blue screen until the selected channel finally appears in stable fashion) .
I have found by experimentation that if I select one of the AV inputs (there are 3 SCARTs) like satellite or cable STB then the TV is fine ; this is why I am assuming it is a tuner (or tuner power supply) fault.
I guess I'll have to take the back off and have a look around.
Before I do this , has anyone come across a similar fault on this chassis (GFL2.30E I believe) ?
I thought at first it might be just a connector making poor contact but, with the ever lengthening settling time, perhaps it's more likely to be a faulty electrolytic capacitor.
I have no circuit diagram or service manual either which doesn't help :-(

I have the usual digital and analogue multimeters, oscilloscope etc. but it would help if I knew what to look for !

Any practical advice would be greatly appreciated

Chris Muriel Manchester.

If it is okay on AV input but blanks to the blue mute screen on tuner I am fairly confident the tuner is faulty.
Philips tuners have a high failure rate and are very expensive to replace, as you have all that equipment I assume you are confident using a soldering iron so I suggest you remove the tuner and send it to MCES for a quick turnaround repair which will cost around a quarter the price of a new tuner.

[Chris Muriel]

Thanks. If it turns out to be a faulty tuner, the handy thing is that MCES are only a couple of miles from me.
I'll check power supplies etc. to it first though.

No problem with soldering etc. (I am actually an applications engineer for a USA IC manufacturer).

Chris Muriel, Manchester.