Daryl, I had one of these drove me nuts also. Mine had an intermittent coil outside of the tuner shield. I don't know if your version has it but it may be worth a shot. Another one had a low B+ line into tuner which turned out to be a resistor had changed value. Sometimes you just got to go back to the beginning and start over. Bill Dravenstott Elza's Home Store LTD Ashland, OH ----- Original Message ----- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Tuesday, October 12, 2004 10:18 PM Subject: [TechAssist] Re: RCA, G27304DT, CTC177AM2, Tuner problem UPDATE > Daryl, > All I can recommend is remove all the solder from the grounds. Get yourself a head-visor magnifier and > look carefully at the tuner area. > As many of these as I have done, I still can find a way to make a solder joint or lift a trace. > If all looks OK, resolder. > Now, moving those coils around was not a wise choice. > Good luck. > > Jeff > -- > Intrepid Video TV/VCR Repair > 263 S Front St, Steelton PA 17113 > 717-939-7708; (F) 717-564-4952 > www.intrepid-video.com www.tech-repair.net > ----- Original Message ----- > From: <daryls_tv@xxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > Sent: Monday, October 11, 2004 11:52 PM > Subject: [TechAssist] Re: RCA, G27304DT, CTC177AM2, Tuner problem UPDATE > > > Another day shot to Hell..... > I spent all day again on this dog. > It was mentioned several times to replace U7301. This was the first part I replaced to no avail. I > didn't have another new one to try but I had the next best thing. I had a working set to borrow parts > from. I replaced the IC again but still no change. Thanks to Barry Thompson for the flow chart. I > followed it out and found nothing wrong. I compared voltages to the working set and didn't find anything > out of line. I swapped out the varactor diodes without any help as well. I figured I couldn't mess it up > any more than what it was... so I played around with the coils and parameters. Now I have some small > gains but still not acceptable. Channel 2 has lines and motor boating. Ch. 3 through 6 is acceptable but > not great. Ch. 7 through 10 is good. Ch.11 has no picture and sound, just lines. Ch. 12 through 18 are > good. Ch. 19 trough 22 are ugly with lines. Ch. 23 through 39 are great. Ch. 40 through 48 has poor > picture with lines and has noise in the sound. Ch. 49 > & 50 has nothing but motor boating. Ch. 51 up is great until Ch. 99 which has lines and a poor picture. > That is the highest channel on the cable system. > I can still place my finger near some of the coils in the tuner and it will perk right up. > Any other ideas would be appreciated. > 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 > > ----- Original Message ----- > From: daryls_tv@xxxxxxx > Date: Sun, 10 Oct 2004 12:42:56 -0600 > To: TechAssist@xxxxxxxxxxxxx > 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 > > > -------------------------------------------------------------------------- --- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ > ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/