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

  • From: Bill Grabowski <bgrabowski@xxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sun, 10 Oct 2004 16:20:28 -0500

Replace the mixer/oscillator chip with that symptom.....

Bill Grabowski
Triangle Appliance
Kenosha,Wi  53142

daryls_tv@xxxxxxx wrote:
> 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 
> wa
s 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
> 
> 

-- 
*****************************
Bill Grabowski
Triangle Appliance
Kenosha,Wi 53142
262-694-6500
262-694-6523 fax
bgrabowski@xxxxxxxxx
*****************************

-----------------------------------------------------------------------------
Lost Password:
http://www.tech-assist.org  and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/

Other related posts:

  1. Home
  2. techassist
  3. Archive
  4. 10-2004