[TechAssist] Re: Zenith 9-823 power board in a SF2569H
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 2 Nov 2002 16:06:41 -0500
If this unit uses 2 different transistors to generate the square wave, then
1 transistor is acting as a switch and the other (bad) one is operating as
an amplifier, rather than a switch...it isn't turning on hard enough. If
this uses an integrated IC, then the same applies, but you may have low
current on the input/base of the output transistor. Hope that steers you in
the right direction.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Mitchs Electronics" <Mitchstv@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, November 02, 2002 12:36 PM
Subject: [TechAssist] Zenith 9-823 power board in a SF2569H
>
> Where is that Genius when I need him?
> Problem is that their is 1 duty cycle sine wave between square wave duty
> cycles at pin #3 input of transformer TX3401 Primary side. Square wave
is
> at the right frequency. For the life of me I cant see where its coming
from,
> or how its being generated. Does not seem to be a component failure.No
print
> and no more Ideas. Only part not checked and or subbed is TX3401.
> Rick Mitchell
> Mitch's Electronics Ser.Co.
> Mitchstv@xxxxxxxxxx
> 3935 south 20th
> Lincoln, Nebraska 68502
>
>
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