Sony KV-27HFR - Bad Tuner?

Question

This may be a toughie.... the set will tune in a station but will not lock on, it just drifts back and forth, alternating between a picture and snow. I replaced all the caps in the tuner section and it made no difference. I can't locate a pre-scaler IC (which I've seen go bad on other sets), so I'm assuming it's built into the tuner itself. Am I looking at a bad tuner at this point? (Part# 1-463-771-11) I'd normally junk anything needing a tuner, but this set just has too nice a picture to give up on it. Thanks for any advice.

AJ · Accepted Answer

Very good probablity, have you checked all the voltages associated with the tuner and compared them to those listed in the service data? Easiest thing may be to sub the tuner and try it.

Leonard Caillouet · Answer

Have you tried resoldering the bad joints in the IF block?  Very common on these uints.Leonard

Chris F. · Answer

I will give that a try, thanks.

Chris F. · Answer

Yup the voltages are all good (don't have the manual but the voltages are marked on the board). A 5V supply was measuring 4.7 (with no measurable AC ripple) but I don't know if that's a problem or not....

Andy Cuffe · Answer

The most common place is on the AFT coil, but check over everythingaround the IF IC.Andy Cuffe

Sony KV-27HFR - Bad Tuner?

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