[TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
- From: "javiles6" <javiles6@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 21 May 2004 12:50:57 -0700
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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