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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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24th Jun 2022, 11:30 pm | #1 |
Pentode
Join Date: Sep 2014
Location: London, UK.
Posts: 113
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Sony Trinitron CRT TV fault
Hello Everyone,
After two decades service, my Sony CRT Trinitron TV is now faulty. Model: KV-32CS70B When powered up it goes into standby and doesn't exit the diagnostic stage. The red flashing light sequence is initially two (over current protection) then goes to three (over voltage protection) when the remote control ON button is pressed. I'd like to save the TV from the tip ...erm the recycling centre.... if I can. Can anyone help, please? ta phil |
25th Jun 2022, 8:32 am | #2 |
Octode
Join Date: Sep 2020
Location: Thetford, Norfolk, UK.
Posts: 1,731
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Re: Sony Trinitron CRT TV fault
Have you carried out a good initial internal inspection? Maybe worn electrolytics in the power supply. Any bulging ones?
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25th Jun 2022, 9:39 am | #3 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
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Re: Sony Trinitron CRT TV fault
I hope the 2 flashes is not loptx.
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25th Jun 2022, 11:03 am | #4 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
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Re: Sony Trinitron CRT TV fault
I think we have line output stage problems here. Firstly check the line output transistor for a short. Then if we're OK there turn on and see if you can hear (!) a rustle of EHT. If so then it can be the frame output IC loading the stage or, as said above, the LOPT.
Do also check for dry-joints on the regulators. Occasional capacitor failure, but not a go to on this chassis. Funny how quickly you forget - saw it was a 32" and though 'oh, just a small one then'. Er, no, not in the days of CRTs! |
25th Jun 2022, 11:59 am | #5 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,184
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Re: Sony Trinitron CRT TV fault
The MCZ3001 IC or ICs would also break sometimes.
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