[TechAssist] Re: JVC-32050
- From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 23 Dec 2003 12:25:33 -0500
See if this helps. I had a similar trouble. See below.
Phil
[TechAssist] JVC AV35750 blue screen only, has OSD FIX
Date:
Mon, 22 Dec 2003 17:47:52 -0500
From:
Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
Reply-To:
techassist@xxxxxxxxxxxxx
Organization:
Jan Phyl TV Inc. ,Philip Bader
To:
"techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
After I completely rebuilt the AV Select board with all new chips, I
found the schemo Ed Gaidis sent me of a similar model AV36050. I was
able to trace the loss of video aaround IC201.
IC201 (TA1242N) takes the main tuner's IF output at pin 8 and it exits
pin 47 thru a 100 ohm SMD R132, on to Q131base, out emitter and on
eventually to Q132 buffer.
The problem was an open R132 (100 ohm) mentioned. Hidden under a glob of
silicon holding a small disc capacitor. I had signal one side of R1321,
nothing the other.
Open R132 replacement cured the blue screen!
Thanks, group and especially Ed Gaidis for the .PDF file!
Merry Christmas!
Phil Bader
-------- Original Message --------
Subject: RE: FW: [TechAssist] Re: JVC AV35750 blue screen only, has OSD
Date: Thu, 04 Dec 2003 13:56:28 -0500
From: Ed Gaidies <teltek3@xxxxxxxxxxxx>
To: 'Philip Bader' <tjanphyl@xxxxxxxxxxxxxxx>
I have a Sams of AV-36050. I think it uses relatively close switching
system. File is just under 2 meg. Will your mailbox take that?
-Ed-
Ed Gaidies
Tel-Tek Electronics.
Ontario-Canada
teltek3@xxxxxxxxxxxx
-----Original Message-----
From: Philip Bader [mailto:tjanphyl@xxxxxxxxxxxxxxx]
Sent: December 4, 2003 12:39 PM
To: Ed Gaidies
Subject: Re: FW: [TechAssist] Re: JVC AV35750 blue screen only, has OSD
Yes! IC101 is a LA7583.
ICs on the AV terminal PC board assy CKF0425-BS1-1:
IC101: LA7583
IC801, IC802: BA7644AN
IC661: BA15218N
IC671: TC4066BP
IC601: NEC C1851CU
IC803: TC4066BP
IC001: KIA7805P1
I now seem to have a noisey picture with a kind of static. Just sort of
started working partially.May go blue again...
Thanks in advance,
Phil
Ed Gaidies wrote:
>
> Ed Gaidies
> Tel-Tek Electronics.
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
>
> -----Original Message-----
> From: Ed Gaidies [mailto:teltek3@xxxxxxxxxxxx]
> Sent: December 4, 2003 10:30 AM
> To: Phil Bader
> Subject: RE: [TechAssist] Re: JVC AV35750 blue screen only, has OSD
>
> Phil;
> Check if IC101 is LA7583..I'm trying to find you a schematic that may
be
> close.
>
> -Ed-
>
> Ed Gaidies
> Tel-Tek Electronics.
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Gaidies
> Sent: December 4, 2003 10:20 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: JVC AV35750 blue screen only, has OSD
>
> Phil;
> How about Audio...or are you just having Video problems. When you try
to
> access the tuner...do you have sound, or just blank screen with OSD.
>
> -Ed-
>
> Ed Gaidies
> Tel-Tek Electronics.
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Philip Bader
> Sent: December 4, 2003 9:37 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: JVC AV35750 blue screen only, has OSD
>
> Update:
> I pulled a used BA15218N from a chassis but same symptom. Maybe it
also
> is bad. I was able to input a good S-Video input picture from my
DVD.I
> feel sure the trouble is an IC on that A/V board.
> But what...
> Phil
>
> Tel-Tek Electronics wrote:
> >
> > Phil;
> > I just did a quick check on Global Semi. The BA15218N is the OP amp.
> The
> > one that does the switching. If you get Video when you inject video
> > (VCR) into one of the inputs, and none from tuner, Suspect BA15218N.
> Not
> > expensive. $1.95 at Global.
> >
> > -Ed-
> >
> > Ed Gaidies
> > Tel-Tek Electronics
> > Ontario-Canada
> >
> > teltek3@xxxxxxxxxxxx
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Philip Bader
> > Sent: Wednesday, December 03, 2003 6:25 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: JVC AV35750 blue screen only, has OSD
> >
> > NO BA7612N, but on the PIP board (which the A/V jack panel is
attached
> > to) are some "BA" prefix IC's:
> > BA7644AN (two)
> > BA15218N (one)
> > Thats all, folks.
> > Some other ICs also.
> > Phil
> >
> > Tel-Tek Electronics wrote:
> > >
> > > Find IC BA7612N...Video Switcher, and replace. I'm not sure what
IC
> > > designation number is for your set, but look for BA7612N.
> > >
> > > -Ed-
> > >
> > > Ed Gaidies
> > > Tel-Tek Electronics
> > > Ontario-Canada
> > >
> > > teltek3@xxxxxxxxxxxx
> > >
> > > -----Original Message-----
> > > From: techassist-bounce@xxxxxxxxxxxxx
> > > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Philip Bader
> > > Sent: Wednesday, December 03, 2003 5:05 PM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] JVC AV35750 blue screen only, has OSD
> > >
> > > Swapped tuners, no help. blue screen only, but OSD menu works
> OK.This
> > > has two tuner pip but his remote is bad so cannot access PIP to
see
> if
> > > it works. A real goat dance...
> > > Any histories on this issue?
> > > Of course the customer is awaiting...
> > > Thanks,
> > > Phil
> > > --
> > > Philip Bader
> > > Jan Phyl TV Inc. (estab. 1976)
> > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > Fax (863) 299-8821
> > > email: tjanphyl@xxxxxxxxxxxxxxx
> > >
> > >
> >
>
************************************************************************
> > > *****
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> > >
> > >
> >
>
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> >
> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: tjanphyl@xxxxxxxxxxxxxxx
> >
> >
>
************************************************************************
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> --
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
************************************************************************
> *****
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>
>
Tel-Tek Electronics wrote:
>
> I believe that set has a Video Switching IC. Switches tuner out put and
> Ext1 and possibly Ext 2. Symptom will normally be no tuner Video, but
> OSD works, and if it has PIP, it will also be working. Using Video 1 and
> Video 2 will be normal. Now...are you sure about the Model #?
>
> -Ed-
>
> Ed Gaidies
> Tel-Tek Electronics
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
> Sent: Monday, December 22, 2003 10:22 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: JVC-32050
>
> Don't see many JVC's here. Sounds like you got a good one. Good luck.
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message -----
> From: "S. Pasher" <spasher@xxxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, December 22, 2003 10:12 PM
> Subject: [TechAssist] Re: JVC-32050
>
> > Al thanks for reply. One of the things I forgot to mention in my
> original
> > email was that the OSD was good , also PIP was still working and had a
> good
> > picture.
> > Buck Pasher
> > Buck's TV
> > Gander Newfoundland
> > Canada
> > 709-256-7738 (Fax & Phone)
> >
> >
> >
> > ----- Original Message -----
> > From: "al m" <ampm@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Sunday, December 21, 2003 11:36 PM
> > Subject: [TechAssist] Re: JVC-32050
> >
> >
> > > Check the able circuit. If no parts are open then maybe the shot of
> > voltage
> > > to the heaters blew out a short in the tube.
> > > Al Marquardt
> > > ampm@xxxxxxx
> > > Al Marquardt Electronic Repair
> > > 206 W Main
> > > Girardville Pa. 17935
> > > ----- Original Message -----
> > > From: "S. Pasher" <spasher@xxxxxxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, December 22, 2003 9:53 AM
> > > Subject: [TechAssist] JVC-32050
> > >
> > >
> > > > I've got a puzzle with this one. It came in with sound no picture.
> If
> > you
> > > > turned the screen up you could get a picture just before the
> overdrive
> > > lines
> > > > come on.
> > > > After chasing video all around the place and finding that
> waveforms
> were
> > > > about 1/4 what they should be coming out of the I/C that feeds the
> > > > pic.socket, I started to check the ABL cct. I found that it was
> 1.5
> volt
> > > > low. Went to F/B found voltage low there also. My tech was
> checking in
> > > that
> > > > area and accidentally shorted pin 2 (ABL and Heater) to pin 3 (210
> volts
> > > to
> > > > pic socket). the picture came back and after 2 hours running is
> still
> > > good.
> > > > I am wondering if anyone has had problems in this area before. I
> don't
> > > like
> > > > to give the TV back and have it fail again for same problem. I
> will
> run
> > it
> > > > for a day or two and if OK and I don't get any replies I will give
> it
> > > back.
> > > >
> > >
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