[TechAssist] Re: Daewoo, DTQ25S2FC, sound distorts after an hour or two

  • From: "tvservice" <tvservice@xxxxxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 12 Nov 2002 16:18:05 -0600

replace c613 and c626 on input pins 3 of both audio ic"c
from daewoo
hth
Robert
tvservice@xxxxxxxxxxxxxxxxxxx
H & H Electronics Inc

----- Original Message -----
From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
To: "T/A list" <techassist@xxxxxxxxxxxxx>
Sent: Monday, November 11, 2002 12:14 PM
Subject: [TechAssist] Daewoo, DTQ25S2FC, sound distorts after an hour or two


>
> I recently signed up as an ASC for Daewoo so I posted this problem on
their
> web site Q&A section, also called and left message twice......it's been
over
> a week and no help from them!
> The sound will get distorted after a long warm-up of an hour or more and
> then gets so weak there is almost no sound. The set uses two KA2201 IC's
to
> drive the two speakers. The following is what I posted on their web site:
>
> "IC's 602, 603 and 604 have been replaced and problem remains, After set
is
> on for about an hour the audio becomes distorted then drops out
completely.
> Probing IC 603 or 604 pin 3 with a scope there is a DC voltage of around 4
> to 5 volts that starts counting down, or discharging, when this voltage
> drops to around 2 volts the audio comes on.
>
> Is there a fix for this problem?"
>
> I have found that a 2.2K resistor added from pin 3 to ground keeps this
> voltage from charging and fixes the problem while having very little
effect
> on the volume level.
> Has anyone had this problem and found a fix or an authorized modification?
> Thanks for any help or suggestions,
>
> Jim Myers
> Since 1972
> Telrad Electronic Services Co.
> Fort Wayne, IN 46815
> jr.myers@xxxxxxxxxxx
> 260-432-4486 Fax and Voice
> Fax is always on
>
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