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torbjorn
Joined: 07 Jun 2007 Posts: 370 Location: Sweden
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Posted: Fri Jun 25, 2010 8:57 pm Post subject: Sharp tv 70DS-03SN, hiccuping PSU |
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A tv as above has hiccuping power supply. For each pulse, there is a flashover across R820 (1K0 SMD resistor, probably in beam current limiting circuitry). R613 (2K2 1W resistor in S-correction network at horizontal deflection coils) has signs of overheating and has changed value to about 12 kohm. All semiconductors in horizontal output seem to be ok.
Any ideas? |
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The_AntiRAM Guest
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Posted: Fri Jun 25, 2010 10:01 pm Post subject: Re: Sharp tv 70DS-03SN, hiccuping PSU |
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torbjorn wrote: | For each pulse, there is a flashover across R820 (1K0 SMD resistor)
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Flyback Trafo ----> H.V. DST BAD.
Anyway Crappy Chassis !!!
(when you start to fix a thing another is going bad) |
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torbjorn
Joined: 07 Jun 2007 Posts: 370 Location: Sweden
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Posted: Mon Jun 28, 2010 8:42 am Post subject: |
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Thanks,
just like what i suspected. A good argument not to repair that set! |
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