[TechAssist] RCA, G27304DT, CTC177AM2, Tuner problem

  • From: daryls_tv@xxxxxxx
  • To: TechAssist@xxxxxxxxxxxxx
  • Date: Sun, 10 Oct 2004 12:42:56 -0600

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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