Question about Sharp 19L-M100 TV

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Tv shut down

Sharp tv#19L-m100bs shut down in 3 second after press on,power supply ok . horizontal transistor ok. any tech have any ideal to solve this problem. i wish your help. thanks.

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Good day.


Have you cheched on your vertical IC? The zener diode along B+ and try to check zener diodes along the secondary supply form your flyback.


chris

Posted on Mar 13, 2008

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Check the horizontal output transistor. Replace the same. Collector to base, or collector to emitter short to this transistor is a common case. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic / Time slide, can be selected by the drop-down list, at the top left of the display window, will make surf easy. You can also do a search, by type in the brand name/model number/IC used, in the search box at the top right of the display window.

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the tv have a fault in the power supply circuit or horizontal circuit check the regulator transistor or ic in your power supply and other components there.check the horizontal output transistor in the horizontal circuit and other components around replace what ever component you find faulty and components associated with the faulty component.good luck.

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Dear sir/Madam,

Check power supply(SMPS) section.Check/replace all electrolytic capacitor without power capacitor and resoldaring power supply section after then check horizontal output transistor.


thanking you
uttam
uttam_bm@yahoo.com

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it might be due to

  • plug or socket loose where tv is connected.
  • loose connection in switch.
  • some connector loose in power supply
  •  switching transistor in power supply &horizontal section loose or wire open
  • some capacitor loose in oscilltor section in power supply.
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  • hope this will help
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1 Answer

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If the set runs at all, your flyback and output transistor are good. If the set shuts down after a few seconds and the sides are wavy, it usually means that the main B+ in your power supply is too high and not regulating properly. I do not know what kind of power supply that model uses, but if has an old-style STR regulator (like the STR30130) then it is probably shorted, and if the set uses a switching power supply then look for an open or leaky electrolytic cap on the primary side. If the power supply is working correctly and the set shuts down, check for an open safety cap (the large 1.6 - 2Kv cap connected to the collector of the horizontal output transistor).

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