[TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 21 May 2004 19:46:19 -0500
Good Info Ron
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Ron Miller d.b.a. Country TV" <rlmbkm@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 21, 2004 12:07 PM
Subject: [TechAssist] Re: Magnavox Mod# PR3446-A106 (PTV515-AHO1) need help
| 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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