[TechAssist] Re: Symphonic 6470 no E to E no video
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 22 Jan 2002 12:21:58 -0500
Its not the tuner that is bad. It is the antenna switch circuit. Sometimes
you can see an open trace or find a defective PIN diode or transistor (all
surface mount) but other times the tiny chip capacitors and resistors are
damaged also. Once in a while the RF modulator IC is damaged, too. My
success ratio at repairing those is not high, but it just takes a minute to
check if the tuner is desoldered.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: <MYERSVCR@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 21, 2002 10:54 PM
Subject: [TechAssist] Re: Symphonic 6470 no E to E no video
>
>
>
> Both tuners must be bad. Pin 3 had 5 volts and pin 4 changed
> Thanks Craig
>
>
> in a message dated 1/21/02 1:55:38 PM Eastern Standard Time,
> greentron@xxxxxxxxxxxxxxxx writes:
>
> << Pin 3 on the tuner needs 5 volts and pin 4 should go down and up as you
> select tv or video. If those things are happening, your boneyard tuner
just
> has the same problem as the original.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> 864 232 3889
> Fax 271 2080
> mailto:greentron@xxxxxxx
> ----- Original Message -----
> From: <MYERSVCR@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, January 20, 2002 10:13 PM
> Subject: [TechAssist] Symphonic 6470 no E to E no video
>
>
> >
> > This VCR displays the TV station no matter whether in TV or VCR mode or
> even
> > when unit is playing a tape
> > If Cable in is removed I get snow/ no audio on playback . I replaced
the
> > tuner with one from boneyard but get exact same results.
> > Any clues? TIA Craig
> > Also does anyone know a list like this one specifically for PC repair
esp
> > hardware? >>
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