Question about Zenith H27F36DT 27" TV

2 Answers

Burning smell Found capacitor in hv area burned and replaced. I have seen a lot of these in my shop and the result is the same....once the capacitor is replaced the set fires up but tyhere is always a phase problem with the picture and a tear. What else needs replacement?

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  • HUNTT Dec 15, 2007

    I have a 36 inch zenith with a burnt up cap in the power supply area. How do I find the caps value so I can replace it with the right one. Thanks for your help!!

  • Steve Nordquist
    Steve Nordquist Mar 28, 2009

    CX3218 (160V, 2.2uF, 85 degrees Celcius) is the obvious blowout (well...the top's domed) and my set just clicks off from a circuit protection element (ZNR?) resetting (the power supply then tries again from the get-go.)
    Not just capacitors but also series resistance of the downstream transistors can become deranged. Sometimes a resistor to ground can chill out an NPN element, sometimes that's not it; and resistors that can tough out the voltage needed are perhaps as expensive as replacing the transistor, even speculatively (e.g. by socket before committing the part.)


  • Steve Nordquist
    Steve Nordquist Mar 28, 2009

    CX3218 (160V, 2.2uF, 85 degrees Celcius) is the obvious blowout (well...the top's domed) and my set just clicks off from a circuit protection element (ZNR?) resetting (the power supply then tries again from the get-go.)
    Not just capacitors but also series resistance of the downstream transistors can become deranged. Sometimes a resistor to ground can chill out an NPN element, sometimes that's not it; and resistors that can tough out the voltage needed are perhaps as expensive as replacing the transistor, even speculatively (e.g. by socket before committing the part.)


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  • Master
  • 981 Answers

Simply replacing CX3218 worked...for 2 hours. It was destroyed shorted and the top domed enough to note.
So: I replaced that with 4 of the same value (a parallel pair of pairs in series, for the same value,) and they still get quite hot, but it lasts longer. More than 2^4 so far.

I'm not relearning Jet Grind Radio very fast, though.

Posted on Apr 04, 2009

  • Steve Nordquist
    Steve Nordquist Apr 05, 2009

    The pic looks good; no tears, maybe visible side edges from less deflection, but they're straight edges in most scene lighting, never far off.  Likely either resistors or the horizontal output transistor base stage are falling off spec.  If they stop making plasma screens and it has to play The Sundance Channel  and IFC rather than Scooby Doo, I'll get in there with a bridge or other ESR meter.  Luckily neither the sweep phase circuit nor overall voltages (driven via the horizontal drive, typically primary to the flyback transformer) were disaffected.


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  • Zenith Master
  • 1,689 Answers

Get an ESR meter and check the ESR of all the caps in the horizontal scan area. I don't know the particulars of the model of set, but I would not rule out damage to the flyback, or any of the other components in the drive circuits to the deflection yoke. This type of fault can take some time to troubleshoot and work out.

You can read about capacitor ESR at this site:
http://wiki.xtronics.com/index.php/Capacitors_and_ESR


Jerry G.

Posted on Apr 12, 2008

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Slinteriors
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SOURCE: Burning smell

Need the board locations of the parts your needing the info on. Such as cxxx or Rxxx stamped on the PC Board.

Posted on Mar 05, 2008

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