[TechAssist] Fixed: Proscan PS32108 CTC187CM input FET.
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 16 Dec 2003 02:33:11 +0000
Proscan
PS32108
CTC187CM
Problem was that after fixing tuner grounds picture was still snowy.
further testing showed that UHF was good and VHF was almost nonexistant
Signal could be injected at the outboard side of L7109 to give passable
picture on strong local stations. what seemed like the Input FET preamp for
the VHF (Q7102) turned out to be a missing or bad ( parts locations are
difficut) 1 meg resistor from the AGC to Q7102 as adding one fixed the
fault. [ under magnifaction there appeared to be a missing surface mount
componet, a cap would help until it charged and placing your finger over the
spot would get it to work]
Peter Oliver
Tucson Radio TV
(I not sure how to write this one up as a tip)
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