[TechAssist] Re: Symphonic Combo TVCR Model # SC3919/ Dead unit.
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 19 Jan 2005 14:51:56 -0500
In that model, the standby voltages are all low except for 5 volts from D641
to power the micro. If it never tries to turn on, one of the three power
safety lines to the micro may be low when the power button is pressed. pins
2, 3, and 4 on the micro are the power safety inputs, and pin 100 is the
x-ray input, which is supposed to be zero volts.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: "armando guerra" <birdie@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 19, 2005 10:02 AM
Subject: [TechAssist] Re: Symphonic Combo TVCR Model # SC3919/ Dead unit.
> I subbed it out and still no go. The vcc coming into the 5v reg is very
low. Can
> someone here give me an idea as to what components feed the 5v reg.I
thought I
> had a manual for this thing but nothing close.
> Mando
> Birdie's TV & Electronics
> Casa Grande, AZ
>
>
> Christopher Barnak wrote:
>
> > I had one a while back, and it was that 5v regulator. How did you check
> > it ?
> > Try a new one.
> >
> > Christopher Barnak, CET
> > Norfolk Public Schools
> > Electronics Division
> > 966 Bellmore Ave.
> > Norfolk, Va. 23504
> >
> > Phone 757 628 3385
> > Fax 757 628 3392
> > cbarnak@xxxxxxxxxxxxx
> >
> > >>> greentron@xxxxxxx 1/18/2005 9:59:47 PM >>>
> > What is the input voltage to IC602?
> > Jerry Silverman
> > Greentron Inc
> > 4 Newland Ave Greenville SC 29609
> > Fax/Phone 864 232 3889
> > greentron@xxxxxxx
> >
> > ----- Original Message -----
> > From: "armando guerra" <birdie@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, January 18, 2005 7:38 PM
> > Subject: [TechAssist] Symphonic Combo TVCR Model # SC3919/ Dead unit.
> >
> > > The above tv is completely dead. No click at all. Fuse is ok.I esr'd
> > all
> > > caps in ps and all are ok.Fusible resisters ok.No shorts
> > found.Working
> > > without a manual. The 5v reg IC602 is putting out only 3.3v.The reg
> > > itself is ok. I checked Q601,switching reg and even subbed it out
> > and
> > > still no go.If some one has tips or idea's or maybe a scan of the ps
> > > ckt,It would be very helpfull so that I can trace the problem.
> > Thanks.
> > > Mando
> > > Birdie's TV & Electronics
> > > Casa Grande, AZ
> > >
> > >
> > >
>
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