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Sharp tv 70DS-03SN, hiccuping PSU

 
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Fri Jun 25, 2010 8:57 pm    Post subject: Sharp tv 70DS-03SN, hiccuping PSU Reply with quote

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
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PostPosted: Fri Jun 25, 2010 10:01 pm    Post subject: Re: Sharp tv 70DS-03SN, hiccuping PSU Reply with quote

torbjorn wrote:
For each pulse, there is a flashover across R820 (1K0 SMD resistor)




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

PostPosted: Mon Jun 28, 2010 8:42 am    Post subject: Reply with quote

Thanks,
just like what i suspected. A good argument not to repair that set!
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