[TechAssist] Re: RCA, G27304DT, CTC177AM2, Tuner problem

  • From: "al m" <ampm@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sun, 10 Oct 2004 14:57:30 -0400

Just had one like that changing the IC that is on top of the board in the 
tuner solved the problem. Sorry I don't remember the IC # but you should 
know which one I am talking about.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message ----- 
From: <daryls_tv@xxxxxxx>
To: <TechAssist@xxxxxxxxxxxxx>
Sent: Sunday, October 10, 2004 2:42 PM
Subject: [TechAssist] RCA, G27304DT, CTC177AM2, Tuner problem


>
> Hi,
> This RCA, model # G27304DT, ch. CTC177AM2, is really kicking my behind.
> It started with the complaint from the customer of losing some channels 
> with lines in the picture.  I pulled it into the shop and did the usual 
> tuner re-soldering job.  Set looked great and was delivered only to find 
> out it was doing the same thing.  Took it back to the shop where it worked 
> great.  I re-soldered everything again plus all of the connections on the 
> smds.  Delivered it again and you guessed it...same thing.
> The channels from 40 through 50 were either missing or full of lines or 
> motor boating.  I played with some of the tuner parameters and it seemed 
> to work but not to my satisfaction.  The customer was pleased, so I left. 
> A week later, same thing.
> I pulled it back to the shop where it worked fine.  BTW... the customer 
> has another set that works fine on the same cable line.  I put an 
> attenuator on my cable line and the trouble showed up and even worse.  It 
> gave me channels 2-6, 18-22, and 40-50 with the problems.  I re-soldered 
> every smd in the video section besides the tuner again and all of the 
> grounds in the set... no help.  Looked with a high power magnifier for 
> cracks in the print (none found).  Replaced IC7301, C7414(cracked), 
> CR7102(didn't check the same as the others), Q7102(RF amp), U3201(eeprom), 
> & U1001(t-chip).  Did the tuner alignments after each parts change but 
> still no joy.  I found that if I would place my finger over coils L7114 & 
> L7112, the set would start to function properly.  I got the same effect 
> placing my finger over L7115, L7113 & L7111.  I didn't have to touch the 
> coils, just put my finger near the coils.  This symptom reminds me of the 
> old tube days when the grid neutralizer trimmer cap was o
> ut of adjustment on the RF amp tube.
> I really hope someone has encountered this and has a cure.... Help!!
> Sorry for the long post but I deemed it necessary to explain the problem.
> Thanks,
> Daryl
> Daryl's TV
> 2402 Wyoming Ave.
> El Paso, TX  79903
> 915-565-9184 Voice/Fax
> daryls_tv@xxxxxxx
> www.angelfire.com/tv2/daryls_tv
>
>
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