[TechAssist] Re: B27A74R One channel after auto prog.
- From: "Webster's TV" <webstertv@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 15 Apr 2005 15:26:39 -0500
Jim,
Here's the answer to Perry's question about the tuner. If you replaced the
tuner and the part # on the tuner is #175-02721, you have to replace a
resistor in the 5v source circuit. The resistor location # is RX3417, and
you change it from a 680 ohm 1/2w, to a 330 ohm 2w. The resistor is in the
5v source supply, off of the collector of Q3404. The tuner will not function
without changing this resistor, and naturally there is no instructions about
this with the replacement tuner. I don't know if this pertains to your model
or not? The model I had this problem with was a A27A11D, but you can tell,
if the tuner # is the same, then this resistor has to be changed.
Dan Webster
Webster's TV
Shullsburg, Wi.
----- Original Message -----
From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, April 14, 2005 1:06 PM
Subject: [TechAssist] Re: B27A74R One channel after auto prog.
> Jim: It that the set where you have to change the value of a resistor when
> you replace the tuner. Why that has to be done, I don't know, it worked
fine
> with the resistor before. I am not sure of the values or location but it
has
> got me before. Maybe someone know more about the location. Just a thought.
>
> Perry Bower
> Electric Medic
> "It's Cheaper to Keep Her"
> http://www.electricmedic.com
> 3850 Washington Road Suite 4C
> Martinez, Georgia 30907
> Phone: 706-8MEDIC4 (863-3424)
> Phone: 706-863-3474
> Fax: 706-863-2316
> mailto:info@xxxxxxxxxxxxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Jim Bailey
> Sent: Thursday, April 14, 2005 11:22 AM
> To: TechAssist
> Subject: [TechAssist] B27A74R One channel after auto prog.
>
>
> Hi Guys,
> I am working on this zenith B27A74R tuner not working proper goes through
> auto search says channels not found but will show one channel, Replaced
the
> tuner, EEPROM, I have the 33v and 5v tuning and the SCL and SDA have 4.9v
on
> there pins doesn't seem to be loaded down. Also the control panel buttons
> seems to not function proper. I believe storm damage was the problem to
> start with, just wonder if anybody has ran into this problem no tip that I
> can find and thanks for any help.
>
> Jim Bailey
> Bailey's TV Sales & Service
> Buckhannon, WV 26201
>
>
>
>
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