[TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off

  • From: "C&W Electronics" <c_w_electronics@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 2 Jan 2003 20:27:23 -0600

Hi Daryl,
Replace C432(100uf/200v), located behind the flyback. You wouldn't think
that this filter would cause the symptom, but it will!

Paul W
C&W Electronics
Azle Texas


----- Original Message -----
From: "D Thunhurst" <dthunhurst@xxxxxxx>
To: "TechAssist" <TechAssist@xxxxxxxxxxxxx>
Sent: Thursday, January 02, 2003 3:59 PM
Subject: [TechAssist] Magnavox RK5554, 27P1 ch....can't turn off


>
> Hi,
> This Magnavox is eating my lunch.  The set comes on at plug in.  The relay
> is used solely for degauss.  The on-off circuit is controlled by the micro
> and is giving me "0" volts in the "on" position and ".6" volt at turn off.
> I have replaced Q430, Q431, Q432, Q433, Z430, R437, C435, and C436.
> The schematic shows that the base of Q432 is connected to the micro and I
am
> getting the biasing on that transistor (marked as on-off switch).
> This set is very sensitive to temperature.  When components are heated,
the
> set can be turned off.
> A simple solution you say??  I thought so too!!
> Every component I stated I replaced was because when I would place the tip
> of the soldering iron just close to each of the various components, the
set
> would function properly.  Freeze the parts and the set could not be turned
> off.
> I even mounted the parts in question on the bottom of the board as not to
> heat or cool any other part and thought to have confirmed the culprit.
> After replacing the part or parts in question using OEM parts,  the same
> symptom occurred,  even with the new parts, absolutely no change.
> I am now at a loss as I have replaced or subbed every part that was
effected
> by heating and cooling. Now I know how a new born calf looking at a gate
> must feel.
> Any ideas or advice would be appreciated.
> Thanks
> Daryl
> Daryl's TV
> 3310 Dyer St.
> El Paso, TX 79930
> 915-565-9184
> 915-564-1024 Fax
> http://dynacomp.freeyellow.com
>
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