[TechAssist] RCA, G27304DT, CTC177AM2, Tuner problem

  • From: mebonnell@xxxxxxxxx (Old TV Man)
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sun, 10 Oct 2004 14:53:41 -0500

I believe the IC Al is talking about is U7301 RCA part # 215532
(CXA1594L).
I have changed several of those myself.

Max Bonnell
Bonnell TV
Robinson, IL 
 
Sender: techassist-bounce@xxxxxxxxxxxxx From: ampm@xxxxxxx(al=A0m) Date:
Sun, Oct 10, 2004, 2:57pm (CDT+1) To: techassist@xxxxxxxxxxxxx Subject:
[TechAssist] Re: RCA, G27304DT, CTC177AM2, Tuner problem Reply=A0to:
techassist@xxxxxxxxxxxxx 

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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