[TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 22 May 2004 10:28:39 -0400
Worked on a PTV 500 series set a while back and the flyback was bad. Take it
out and ring it.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "javiles6" <javiles6@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, May 22, 2004 12:39 PM
Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
> Damon
>
> I think i`m gonna have to wait to do this because yesterday i change the
.22
> ohms resistor and replace it with the original .33 ohms and the transistor
> shorted out again. Not having one available i used a generic NTE 2331 and
at
> soon as i plug the cable to the AC the transistor shorted again. Left it
> alone and this morning went out and got the 2SD1556 and install it but now
> the high voltage will not kick. I have the standby light on in the power
> supply but the one that turns on when you press the power button is not.
> Also there is no sound. Ain`t this some s--t. Now without an schematic is
> gonna be hard to find the shorted part that this fu----g generic burn.
This
> will teach me a lesson that not all generic transistor will works in all
> set. Any suggestion. I have check the power supply but the regulator is
good
> and all associated parts .
>
> Thanks
>
> Jose
>
> ----- Original Message -----
> From: "Damon" <damon101@xxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, May 21, 2004 5:40 PM
> Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need
help
>
>
> > Can you monitor the Horiz collector with your O'scope without blowing up
> > your O'scope and the HOT?? I'd like to know if the retrace pulse is
within
> > 12uS and below 1100 Vpp (I think norm is 1050Vpp)......I'd lean towards
> > replacing the caps since that's cheaper than the IHVT.
> >
> > Damon Brunger
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> > ----- 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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