[TechAssist] Re: CTC177-no tuning voltage from PLL IC
- From: wa4fty@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 29 Nov 2002 05:47:35 +0000
Richard, I do no know if I can help here but I would like to tell you that I
just worked on an RCA PTK CTC178L2B AJ chassis and just about went nutz trying
to correct a pincushion hour glass problem. The RCA pin amp -- a FET IRF730
with china stamped on it.. had the correct part number on the package and on
the device but the device had the wrong polarity. Make sure something like this
has not happen to you. GOOD LUCK, Wayne / Tv Service Company, Lexington, S.C.
>
> Hello all,
> Hope everybody had a great Thanksgiving day.
> The pll transistor has 30 volts on the collector no matter what channel I
> select. The band switch works perfect, I can put a pot from the col to the
> gnd and get all channels on every band. I changed the PLL IC & crystal, the
> mixer IC, the eeprom & micro, resoldered the tuner, checked the voltages at
> all the ic pins, checked the diodes and resistors in the feedback circuit
> and no luck.The clock and data lines must be ok because the PLL IC is
> switching bands.Could I have another bad PLL IC?, or has anybody seen some
> other part here?
> Thanks,
>
> Richard La Placa
> Continental TV
> 312a Park Row
> Chestertown, Md,21620
> Fax&Phone-410-778-1113
> continentaltv@xxxxxxxxxxx
>
>
>
>
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