[TechAssist] Re: Fw: 20GT375 CTC176E No channels above 50 UPDATE
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 21 Oct 2005 08:36:37 -0400
Thanks Jay I checked all the voltages on the transistors and they all look
good. Will post if I find this Bugger.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "J. Knoll" <jaystv@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, October 21, 2005 8:29 AM
Subject: [TechAssist] Re: Fw: 20GT375 CTC176E No channels above 50 UPDATE
>I have had the band switching transistors cause this very problem in ctc195
> and other similar chassis. Jay-Jay's TV
> On 10/21/05, al m <ampm@xxxxxxx> wrote:
>>
>> I think you're right I will change the IF amp Today.
>> Al Marquardt
>> ampm@xxxxxxx
>> Al Marquardt Electronic Repair
>> 206 W Main
>> Girardville Pa. 17935
>> ----- Original Message -----
>> From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
>> To: <techassist@xxxxxxxxxxxxx>
>> Sent: Friday, October 21, 2005 8:08 AM
>> Subject: [TechAssist] Re: Fw: 20GT375 CTC176E No channels above 50 UPDATE
>>
>>
>> > Haven't finished my coffee yet, meant to include the part number for
>> > the
>> > IF transistor in case you didn't have it, q7601 146848, but If the
>> > channels below 50 are ok I don't think it could be an AGC problem.
>> >
>> > The AGC feeds UHF amp q7101 200566.
>> > On this set the UHF and VHF amps are the same, you could swap them
>> (SMDs).
>> >
>> >
>> >
>> > Wayne Vanaman
>> > Omega Electronics
>> > 6904 W Fairfield Dr
>> > Pensacola, Fl. 32506-3310
>> >
>> > Wayne@xxxxxxxxxxxxxxxxxxxxx
>> > WWW.PensacolaTVRepair.Com <http://WWW.PensacolaTVRepair.Com>
>> >
>> > 850-456-5995 voice
>> > 850-458-6369 fax
>> >
>> >
>> > al m wrote:
>> >> Thanks Wayne. Did that and the voltage changed.I'm thinking it's a IF
>> >> problem and am going to change the IF amp.
>> >> Al Marquardt
>> >> ampm@xxxxxxx
>> >> Al Marquardt Electronic Repair
>> >> 206 W Main
>> >> Girardville Pa. 17935
>> >> ----- Original Message -----
>> >> From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
>> >> To: <techassist@xxxxxxxxxxxxx>
>> >> Sent: Friday, October 21, 2005 7:44 AM
>> >> Subject: [TechAssist] Re: Fw: 20GT375 CTC176E No channels above 50
>> UPDATE
>> >>
>> >>
>> >>
>> >>>Al:
>> >>>To determine if it is an AGE problem within the processor you have to
>> >>>vary the IF input and monitor the output.
>> >>>
>> >>>Wayne Vanaman
>> >>>Omega Electronics
>> >>>6904 W Fairfield Dr
>> >>>Pensacola, Fl. 32506-3310
>> >>>
>> >>>Wayne@xxxxxxxxxxxxxxxxxxxxx
>> >>>WWW.PensacolaTVRepair.Com <http://WWW.PensacolaTVRepair.Com>
>> >>>
>> >>>850-456-5995 voice
>> >>>850-458-6369 fax
>> >>>
>> >>>
>> >>>al m wrote:
>> >>>
>> >>>>I changed both IC's and same thing. I did notice the AGC isn't
>> changing.
>> >>>>Put
>> >>>>IF in from My sencore and Perfect picture and AGC is down to
>> 5V.Checked
>> >>>>voltages on the op amp outputs with the cable connected and they are
>> >>>>within
>> >>>>( . )1V. This has got me by the balls. It;s only a 20" tv, but I
>> >>>>would
>> >>>>like
>> >>>>to find the problem. Any Ideas?
>> >>>>
>> >>>>Al Marquardt
>> >>>>ampm@xxxxxxx
>> >>>>Al Marquardt Electronic Repair
>> >>>>206 W Main
>> >>>>Girardville Pa. 17935
>> >>>>----- Original Message -----
>> >>>>From: "al m" <ampm@xxxxxxx>
>> >>>>To: "tech assist" <techassist@xxxxxxxxxxxxx>
>> >>>>Sent: Wednesday, October 19, 2005 2:01 PM
>> >>>>Subject: [TechAssist] Fw: 20GT375 CTC176E No channels above 50
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>>>I know I saw this here but I can't find it in the archives or my
>> tips.
>> >>>>>>I
>> >>>>>>think you replace U7401 for this. I know anything below 50 is
>> >>>>>>U7301.
>> >>>>>>Al Marquardt
>> >>>>>>ampm@xxxxxxx
>> >>>>>>Al Marquardt Electronic Repair
>> >>>>>>206 W Main
>> >>>>>>Girardville Pa. 17935
>> >>>>>>
>> >>>>>
>>
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>
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