[TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
- From: "Ron Miller d.b.a. Country TV" <rlmbkm@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 21 May 2004 12:07:30 -0500
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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