[TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
- Date: Fri, 21 May 2004 12:17:45 -0700
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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