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

From: "dolph1133" <dolph1133@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Mon, 6 Jan 2003 08:10:18 -0800
Is relay energized ?

Adolph Gower
Cordova TV
10275 Old Placerville Rd. #5
Sacramento, Ca. 95827-3044
Phone (916) 363-6565
Fax (916)363-7623
Email:dolph1133@xxxxxxxxxxx

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of D Thunhurst
Sent: Monday, January 06, 2003 6:29 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off



Yes I did change this zener.  I had 5.2v on the old one and now I have 5.6v
on the new one.  Still no help.
Daryl
Daryl's TV
3310 Dyer St.
El Paso, TX 79930
915-565-9184
915-564-1024 Fax
http://dynacomp.freeyellow.com
-----Original Message-----
From: Gemini Computer & TV <geminitv@xxxxxxxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Monday, January 06, 2003 6:14 AM
Subject: [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off


>
>Did you replace Z430? The original part number of 5303000001 is in the old
>10NC Philips part number format while the "new" part number 483513097005 is
>the 12NC part number system.
>
>Bob Waterman, CET® #RI-28
>Master Technician License #9109
>Service Manager
>Gemini Computer, TV, & Security Alarms
>(508)695-7302
>(508)695-7769 FAX
>geminitv@xxxxxxxxxxxxxxxx
>geminitv@xxxxxxx
>
>----- Original Message -----
>From: "D Thunhurst" <dthunhurst@xxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Friday, January 03, 2003 7:00 PM
>Subject: [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off
>
>
>>
>> Bob,
>> Thanks so much for your reply.
>> With a bit of embarrassment, I was interrupted several times while trying
>to
>> post this problem that I failed mention I already replaced IC400 and
>IC402.
>> I also replaced C459 and C431.  I also resoldered the usual poor solder
>> joints that these sets all have.  I checked as suggested, C421, C430,
R427
>> and R428.  My voltages on Q433 are:
>> C=9.2
>> B=0
>> E=0
>> this is with the set in the "on" mode.
>> C=8.4
>> B=.6
>> E=0
>> this is in the "off" mode.
>> There is 9.4v on P2 of IC402 with no change in voltage in "on" or "off"
>> mode.  I would definitely say that IC402 is the culprit but I did already
>> change it to no avail.  You mentioned that the 483513097005 replaces
>> 5303000001.  Is this possibly an upgrade for this problem as I had the
old
>> number in stock.
>> This seems to be the only problem with this set.  Everything else is
>working
>> properly.
>> Again, thanks for your help.
>> Daryl
>> Daryl's TV
>> 3310 Dyer St.
>> El Paso, TX 79930
>> 915-565-9184
>> 915-564-1024 Fax
>> http://dynacomp.freeyellow.com
>> -----Original Message-----
>> From: Gemini Computer & TV <geminitv@xxxxxxxxxxxxxxxx>
>> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
>> Date: Thursday, January 02, 2003 6:37 PM
>> Subject: [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off
>>
>>
>> >
>> >First thing to do is replace IC402 (optoisolator IC). It is part #
>> >483513097005 (formerly part# 5303000001). If that does not take care of
>it,
>> >then check Z430, C421, C430, R427, R428, Q433, and IC400. I am almost
>> >certain this should cure it. let us know how you make out.
>> >
>> >Bob Waterman, CET® #RI-28
>> >Master Technician License #9109
>> >Service Manager
>> >Gemini Computer, TV, & Security Alarms
>> >(508)695-7302
>> >(508)695-7769 FAX
>> >geminitv@xxxxxxxxxxxxxxxx
>> >geminitv@xxxxxxx
>> >
>> >----- Original Message -----
>> >From: "D Thunhurst" <dthunhurst@xxxxxxx>
>> >To: <techassist@xxxxxxxxxxxxx>
>> >Sent: Thursday, January 02, 2003 7:50 PM
>> >Subject: [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off
>> >
>> >
>> >>
>> >> Thanks for the reply.
>> >> Is this the famous 100@200v cap you have reference to?  If so, this
set
>> >> doesn't use it.  C432 on this set is a .1@50v cap.
>> >> Daryl
>> >> Daryl's TV
>> >> 3310 Dyer St.
>> >> El Paso, TX 79930
>> >> 915-565-9184
>> >> 915-564-1024 Fax
>> >> http://dynacomp.freeyellow.com
>> >> -----Original Message-----
>> >> From: TV Doctors <tvdoctors@xxxxxxxxxxxxx>
>> >> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
>> >> Date: Thursday, January 02, 2003 4:55 PM
>> >> Subject: [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off
>> >>
>> >>
>> >> >
>> >> >
>> >> >Change C432
>> >> >-------Original Message-------
>> >> >
>> >> >From: techassist@xxxxxxxxxxxxx
>> >> >Date: Thursday, January 02, 2003 01:59:09 PM
>> >> >To: TechAssist
>> >> >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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Follow-Ups:
- [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off
  - From: mike wilson
References:
- [TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off
  - From: D Thunhurst
[TechAssist] Re: Magnavox RK5554, 27P1 ch....can't turn off

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