[TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help

I don't know,but the board should be marked with something like
APW015 or similar

Peggs

At 05:11 PM 5/21/04, javiles6 wrote:
>Peggs
>
>What is the module # for this set. Tri-state does not have it listed by
>chassis #
>
>Thanks
>
>Jose
>----- Original Message -----
>From: "peggs" <peggs@xxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>; <techassist@xxxxxxxxxxxxx>
>Sent: Friday, May 21, 2004 12:17 PM
>Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
>
>
> > If it's not the Picture tube(blue usually),nor the HV Splitter,the
> > Module can probably be replace for around $100.00 exchange.
> > Remember the Blue and Green pix tube coolants will need to be exchanged
> >
> > Peggs
> >
> > At 10:07 AM 5/21/04, Ron Miller d.b.a. Country TV wrote:
> > >Do you have a O'scope?Have you looked at the base and C. waveforms?
> > >  If the base is distorted or low you have a drive problem, if the
>C.waveform
> > >has ringing in it or is distorted you have a flyback ,timing cap or
> > >distribution block problem.hth
> > >Country TV
> > >Ron Miller
> > >Inez, TX. 77968
> > >
> > >----- Original Message -----
> > >From: "javiles6" <javiles6@xxxxxxxxxxx>
> > >To: <techassist@xxxxxxxxxxxxx>
> > >Sent: Friday, May 21, 2004 2:50 PM
> > >Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need
>help
> > >
> > >
> > > > Damon
> > > >
> > > > First of all, thanks for this info. Yes the HOT is an original D1556
>but
> > > > right now while bringing up the screen voltage the resistor open
>again.
> > >Also
> > > > i did what you say in your post to remove the CRT board and monitor
>the
> > >heat
> > > > level but the HOT was still getting hot. So the CRT is not the issue
>here.
> > >I
> > > > might have a bad flyback. Now before the resistor open the voltages on
>the
> > > > HVOT was C=130V, B=7V and E=2V can someone confirm this voltage for
>me. I
> > > > don`t have the schematic and i`ll sure appreciate if anybody will
>e-mail
> > >the
> > > > horizontal section.
> > > >
> > > > Thanks
> > > >
> > > > Jose
> > > > ----- Original Message -----
> > > > From: "Damon" <damon101@xxxxxxxxxxxxxx>
> > > > To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> > > > Sent: Friday, May 21, 2004 6:07 AM
> > > > Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need
> > >help
> > > >
> > > >
> > > > > Jose,
> > > > >
> > > > > The 0.33 ohm resistor is on the emitter side of the HOT, if it's
>getting
> > > > hot
> > > > > but staying alive, you may have a short in the IHVT, but my
>experience
> > >has
> > > > > also seen the HV caps go off value too....I don't think the
>resistance
> > > > would
> > > > > affect it that much being on the emitter to ground path, it
>literally is
> > >a
> > > > > fuse for the 130v supply And remember, the HOT operates as a
> > >switch...the
> > > > > 0.22 ohm doesn't affect the "switching parameters" of the
>Transistor.
> > >Are
> > > > > you using the original HOT....not a sub??? I think that's critical
>on
> > >this
> > > > > unit if I remember correctly...
> > > > >
> > > > > Even though this is an earlier model than the ones that crack the
>crt's
> > >,
> > > > I
> > > > > think it would be wise to monitor the heat level of the HOT with the
>crt
> > > > > boards disconnected just to make sure you're not feeding a shorted
> > >crt....
> > > > >
> > > > > >From the looks of the postings, it looks like your Tv should be
> > > > operational,
> > > > > so you may be spending TOO MUCH TIME on this "HOT is hot" issue,
> > > > especially
> > > > > since 2sd1556 can easily be substituted by the HEFTIER 2sd1878 or
> > > > > 79....there's a lot more than these two....I think they are 60
>watters.
> > > > >
> > > > > You have an issue with video shutdown here, since you've scoped the
> > > > vertical
> > > > > output, I can't immediately think of anything else.....or have you
> > >scoped
> > > > > the vertical??
> > > > >
> > > > > Damon Brunger
> > > > > Telrad Electronic Services
> > > > > Ft Wayne, IN 46815
> > > > > ----- Original Message -----
> > > > > From: "javiles6" <javiles6@xxxxxxxxxxx>
> > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > Sent: Friday, May 21, 2004 2:58 AM
> > > > > Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1)
>need
> > > > help
> > > > >
> > > > >
> > > > > | Jeff
> > > > > |
> > > > > | I did increase the screen voltage but did not see any line. I also
> > >check
> > > > > | C827 and is good. But my question is although the resistor i
>replace
> > >was
> > > > > | lower in ohms than the original the set was suppose to whether
>blow
> > >the
> > > > > | HVOT, open the resistor or work, but neither of the three happen.
>The
> > > > HVOT
> > > > > | was not firing, instead it was getting hot. To me i think that you
> > >must
> > > > > put
> > > > > | the right resistor in order for the HVOT to work. Anyway tomorrow
>i
> > >will
> > > > > get
> > > > > | one and let you know what happen.  Thanks
> > > > > |
> > > > > | Jose
> > > > > |
> > > > > | ----- Original Message -----
> > > > > | From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
> > > > > | To: <techassist@xxxxxxxxxxxxx>
> > > > > | Sent: Thursday, May 20, 2004 7:02 PM
> > > > > | Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1)
>need
> > > > > help
> > > > > |
> > > > > |
> > > > > | > Try increasing the screen control to rule out a vertical
>problem.
> > > > > | > you have to be able to look while you do this, if there is
>vertical
> > > > > | collapse, it won't take long for the
> > > > > | > line to etch the CRT's.
> > > > > | > There was a capacitor listed in the tip I sent you, did you
>check
> > > > that?
> > > > > | >
> > > > > | > Jeff
> > > > > | > --
> > > > > | > Intrepid Video TV/VCR Repair
> > > > > | > 263 S Front St, Steelton PA 17113
> > > > > | > 717-939-7708; (F) 717-564-4952
> > > > > | > www.intrepid-video.com  www.tech-repair.net
> > > > > | > ----- Original Message -----
> > > > > | > From: "javiles6" <javiles6@xxxxxxxxxxx>
> > > > > | > To: <techassist@xxxxxxxxxxxxx>
> > > > > | > Sent: Friday, May 21, 2004 12:23 AM
> > > > > | > Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106
>(PTV515-AHO1)
> > >need
> > > > > | help
> > > > > | >
> > > > > | >
> > > > > | > Jeff
> > > > > | >
> > > > > | > Thanks, I have already found Q901 and R934 faulty, all i`m
>waiting
> > >for
> > > > > is
> > > > > | to
> > > > > | > get the .33ohm resistor to try and see if this baby turns on. I
>have
> > > > not
> > > > > | > rang the fly because i don`t have a fly tester, all i hope is
>the
> > >fly
> > > > is
> > > > > | not
> > > > > | > the culprit of this problem. And just for testing purpose i try
>a
> > > > > .22ohms
> > > > > | > instead of the .33ohms and the HVOT got hot and there were no
> > >voltage
> > > > > | coming
> > > > > | > out of neither leg of the transistor. I wick out one leg of the
> > > > resistor
> > > > > | and
> > > > > | > the voltage comes back up. What is the purpose of R934 in this
>ckt.
> > > > Does
> > > > > | it
> > > > > | > have to be the correct ohms to trigger the HVOT. I don`t have
>the
> > > > > | schematic
> > > > > | > to study this ckt. Any ideas.
> > > > > | >
> > > > > | > Thanks
> > > > > | >
> > > > > | > Jose
> > > > > | > ----- Original Message -----
> > > > > | > From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
> > > > > | > To: <techassist@xxxxxxxxxxxxx>
> > > > > | > Sent: Thursday, May 20, 2004 12:43 PM
> > > > > | > Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106
>(PTV515-AHO1)
> > >need
> > > > > | help
> > > > > | >
> > > > > | >
> > > > > | > > Jose,
> > > > > | > > All I have..from Tech Repair CD:
> > > > > | > > Sylvania\SWR4620 PTV520-AH01\No high voltage. Audio
> > > > > | > OK\\\PTV520-AH01\Replaced  shorted Q906 (2sd1556)*
> > > > > | > > Open R934 (.33 ohm) and fly (4835-1406-7128). Noticed a
>leaking
> > > > lytic
> > > > > on
> > > > > | > the top edge of the same defl
> > > > > | > > board: C827 (1000/25V)\\\\\\\\
> > > > > | > >
> > > > > | > >
> > > > > | > > Jeff
> > > > > | > > --
> > > > > | > > Intrepid Video TV/VCR Repair
> > > > > | > > 263 S Front St, Steelton PA 17113
> > > > > | > > 717-939-7708; (F) 717-564-4952
> > > > > | > > www.intrepid-video.com  www.tech-repair.net
> > > > > | > > ----- Original Message -----
> > > > > | > > From: "javiles6" <javiles6@xxxxxxxxxxx>
> > > > > | > > To: <techassist@xxxxxxxxxxxxx>
> > > > > | > > Sent: Thursday, May 20, 2004 3:40 AM
> > > > > | > > Subject: [TechAssist] Magnavox Mod# PR3446-A106 (PTV515-AHO1)
>need
> > > > > help
> > > > > | > >
> > > > > | > >
> > > > > | > > Hello Techs
> > > > > | > > This set came in yesterday with sound but no picture. Found
>HVOT
> > > > > | > shorted(D1556)(Q901) but before i install
> > > > > | > > the new one (2SD1556) i check the surrounding parts that
>connect
> > >to
> > > > > the
> > > > > | > transistor, D910, R961 and L903
> > > > > | > > and they check good. I also resolder the T901 just to make
>sure i
> > > > have
> > > > > | no
> > > > > | > problem. Now the set have High
> > > > > | > > Voltage and the picture tubes filament are lighted but still
>have
> > >no
> > > > > | > picture. I also check the voltage on
> > > > > | > > the CRT ckt and is 225V on all three CRT resistors. Now i
>don`t
> > >have
> > > > > an
> > > > > | > high voltage probe so i  don`t
> > > > > | > > know if the high voltage is reaching the picture tube anode.
>Does
> > > > > | someone
> > > > > | > have any idea or tips that can
> > > > > | > > help me with. I`m free to any suggestion.
> > > > > | > >
> > > > > | > > Thanks
> > > > > | > >
> > > > > | > > Jose
> > > > > | > >
> > > > > | > > Aviles Computer & TV Repairs
> > > > > | > > 508 Bingaman st
> > > > > | > > Reading, PA 19602
> > > > > | > > Tel # 610-478-1342
> > > > > | > >
> > > > > | >
> > > > > |
> > > > >
> > > >
> > >
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