[TechAssist] Re: GE 19TVR01 Issues
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 23 Sep 2001 11:25:11 -0400
Here's what we've found so far on this one.....if anyone has this schematic
..( we do not!)...please follow along!
This looks like a Samsung Built Chassis
Thompson had replied :
Check IC901-29.
It should go high when you turn the set on. If it is low check IC901.
Yes: Check the 14-volts IC850-1.
Check IC850-2 for 12 volts.
Check Q850-C for 6 volts.
Check Q850-E for 5-volts
Then we checked the following
Ok....IC901-25 does go to 4.6DCV with a square wave pulse when power button
is pressed.
IC850-2 does toggle on to12VDC then shuts down after the power cycle fails.
Q850 voltages are exactly as you specified.
I have located a pinout/PDF of IC501.
No H-drive from this IC. We did change the IC with a new one
Pin16 of IC501 is 12V(VCC of IC501)...ground on Pin 28 OK
Crystal X401 is not oscillating...0VDC on both pins.
It looks like there is some kind of circuitry that applies DC to X401 to
start the Oscillation process....
It this how the Unit supposed to start? By having DC applied to this
crystal?
Jeff Stielau
Shoreline Electronics Repair
125 Beechtree Lane
Westbrook,CT 06498
860-399-1861 Voice
860-664-3535 Fax
jstielau@xxxxxxxx
----- Original Message -----
From: "GJCHAMBERS" <gjchambers@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, September 17, 2001 6:40 PM
Subject: [TechAssist] Re: GE 19TVR01 Issues
>
> also see if you are getting the b+ to the horiz drive transformer primary.
> gary
> Gary Chambers
> Chambers T V
> Bradenton,Florida
> Since 1982
> ----- Original Message -----
> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, September 17, 2001 2:51 PM
> Subject: [TechAssist] Re: GE 19TVR01 Issues
>
>
> >
> > A search with GOOGLE will find a PDF file with pinouts for the LA7625.
> >
> > Jim Myers
> > jr.myers@xxxxxxxxxxx
> > ----- Original Message -----
> > From: "Shoreline Electronics" <jstielau@xxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, September 17, 2001 10:36 AM
> > Subject: [TechAssist] GE 19TVR01 Issues
> >
> >
> > >
> > > Make : GE
> > > Model : 19TVR01
> > > Problem : Won't turn on. When power button is pressed , power light
> > flashes
> > > TEN times.
> > >
> > > This unit doesn't use the parental lock feature like other models
where
> > the
> > > light will flash SIX times.
> > >
> > > Unit apparently was surged in a storm......
> > >
> > > We haven't acquired a schematic for this set yet...but some basic
> checking
> > > in the power supply we have found...
> > >
> > > All B+ voltage from Powersupply/Sweep board are good ( according to
> > > silkscreen values next to connectors).
> > > Unit just appears to be lacking Horiz drive. Collector of Horiz.
Output
> > is
> > > 125V.
> > >
> > > Looks like H-drive comes from IC501 (LA7625)
> > >
> > > I don't have print on this so I can't verify B+ to IC 501 or proper
> > > drive/support signals to it.
> > >
> > >
> > > With the Power LED blinking 10 Times....is there a fault condition for
> > this?
> > >
> > > Jeff Stielau
> > > Shoreline Electronics Repair
> > > 125 Beechtree Lane
> > > Westbrook,CT 06498
> > > 860-399-1861 Voice
> > > 860-664-3535 Fax
> > > jstielau@xxxxxxxx
> > >
> > >
> > > Help make your TechAssist online repair tips
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> >
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>
> Help make your TechAssist online repair tips
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>
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