RCA 27GT618 Tuning problems

[Kirk S.]

Hi,

Got a friend with the above TV that doesn't change channels properly.
Actually, it changes channels, the picture is really fuzy. If he uses his
VCR to select channels, the picture is fine. PIP works ok as well. I'm not
sure if the VCR goes into the tuner or the video inputs. He said that
shortly before this there was a storm and the next day, the cable people
were out driving a ground stake into the ground by one of the poles.

Any ideas what to look for? Chassis is CTC187BD2.

Thanks!

Kirk S.

 

[Jerry Greenberg]

If the pictures are snowy, check that the cable feed, and cable signal
getting to the set is good.

If the pictures are still snowy, it is possible that there is an AGC
fault, or that the RF amplfier in the tuner section is defective. This
can be from a component failure, or a cold solder connection
somewhere.


Jerry Greenberg
===============

 

[Art]

If this chassis used the infamous Thomson On Board Tuner it may be time to
have that serviced professionally. Also having the E_Prom's data confirmed
with the use of the Chipper Checker. First repairs to the on-board-tuner
then the data confirmation. Having reference points in the tuners float
above reference potential can and will damage the E-Prom or contaminate the
data.

 

[Tom MacIntyre]

If this chassis used the infamous Thomson On Board Tuner it may be time to
have that serviced professionally. Also having the E_Prom's data confirmed
with the use of the Chipper Checker. First repairs to the on-board-tuner
then the data confirmation. Having reference points in the tuners float
above reference potential can and will damage the E-Prom or contaminate the
data.

CTC187 does have the onboard tuner.

Tom

 

[Kirk S.]

Thanks for the info. I managed to get a hold of a copy of the supplemental
training manual on this chassis. It recommends using a DIMM to test
individual components based upon symptoms. Hopefully, something easy like a
fusible resistor took the brunt of the damage and can be easily fixed.

Kirk S.