Sylvania/Funai TV/DVD/VCR shutdown question

From: D H A C (dont_havacow_at_yahoo.com)
Date: 06/25/04


Date: Fri, 25 Jun 2004 15:47:23 -0400

This is regarding a Sylvania model SRCD227 27" combo that's about 2 years
old. This group has helped me in the past with these combo units, I'm hoping
someone will recognize this problem and maybe a couple of diodes will fix
it. I have no schematic.
What I have is a TV that will power up. You can get an excellent (off-air)
picture for a few seconds and then it will shut off. D2645 appears to have
been running a little hot....not sure if this is related although the diode
checks good on the ohm meter. All of the other diodes in this area also
check good with the meter and there doesn't appear to be any shorts at the
diodes outputs. Another clue is there doesn't seem to be any power to the
motor in the DVD player and the VCR doesn't go through it's self test when
first plugged in.
If anyone has had a similar problem and could make a suggestion or if
someone has access to a schematic and would be willing to forward.

TIA,
Steve



Relevant Pages

  • Re: That Lowes flashlight, again
    ... misquote) a reference on rectification. ... power and the full wave rectified power, ... with perfect diodes, you'd have 100% efficiency, but you won't have DC ... You are mixing up voltage and power. ...
    (rec.bicycles.tech)
  • Re: That Lowes flashlight, again
    ... I think where you're confused is that you're looking at the AC input power and the full wave rectified power, ... Indeed, with perfect diodes, you'd have 100% efficiency, but you won't have DC yet! ... LEDs are constant voltage devices. ... The only reason to stack 2 or more LEDs in a generator driven application is to improve the efficiency slightly by matching the generator load more closely to its designed load and making the real rectification power a smaller fraction of the load power. ...
    (rec.bicycles.tech)
  • Re: That Lowes flashlight, again
    ... I think where you're confused is that you're looking at the AC input power and the full wave rectified power, ... Indeed, with perfect diodes, you'd have 100% efficiency, but you won't have DC yet! ... The ideal diode has a discontinuity in its resistance, changing from infinite to zero when it passes through the forward voltage threshold. ... The only reason to stack 2 or more LEDs in a generator driven application is to improve the efficiency slightly by matching the generator load more closely to its designed load and making the real rectification power a smaller fraction of the load power. ...
    (rec.bicycles.tech)
  • Re: Using a uC for DC-DC conversion?
    ... >with less voltage drop than the mosfet body diodes for long enough to blow the ... He had worked in surge protection for power plants... ... though and that alone might rule it out in an inverter. ...
    (sci.electronics.design)
  • Re: Sylvania/Funai TV/DVD/VCR shutdown question
    ... units with DVD, but have repaired a few of the TV/VCR types. ... My approach would be to confirm that any power supply sources (any that are ... but unable to avoid the challenge of repairs. ... All of the other diodes in this area also ...
    (sci.electronics.repair)