[TechAssist] Re: JVC AV32320 (HELP)vert problem need help
- From: tjanphyl@xxxxxxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 29 Oct 2005 02:41:03 -0400
From the tech page of:
http://wa6ati.com/Jvc.html
JVC AV27015 Sound Missing Vertical deflection collapse after 30
seconds vertical IC okay 9volt regulator being pulled down to 3 volts
after 30 seconds 9volts goes to vertical oscillator . chip and also
the audio processor Found the audio ic 651 #upc1851 bad
-------------------------
JVC AV27850 GV Vertical Unit has no vertical sweep. IC521 has short
from IC521(1 & 2) when the chip is removed. Problem caused by
shorted D422 a 75 volt zener diode. Also bad was IC421(LA7832), D421
(1N4003) R542(6.8ohm@2watt) & C425(100mfd@35vdc)
--------------------------
JVC AV36950 GV Vertical Unit has retrace lines at the top of the
screen. Tech replaced the vertical output IC for a no vertical sweep
symptom. After replacing the chip IC521 the raster was short and
retrace lines at the top of the screen. IC over heating. Recommended
to replace IC421(LA7832) again an also the charge pump diode and
capacitor. D421(1N4003) & C425(100mfd@35vdc)
-----------------------------
JVC AV27820 FA Vertical Sweep missing AV27820 Unit had no vertical
sweep and no audio, and replacing the IC541 9V regulator repaired the
vertical only. But still no audio. When looking in the customer menu
there are no audio adjustments at all.
The composite audio signal was good up to the MTS module, but no left
& right audio from it. Somehow the EPROM data had been corrupted or
changed. There was nothing unusual in the values of the parameters in
the service mode. But if we press "Display" & "Video Status" again,
when already in the service mode, it brings up a second menu
called "system constants".
---------------------------------
JVC AV27820 FA Vertical Sweep missing AV27820 serial 08219533. Unit
had no vertical sweep. But after correcting the vertical sweep trouble
the set has insufficient vertical sweep and no video or OSD Suggest
the tech check the 9 volt regulator ion the chassis. This Is a 3
legged device that has a heatsink on it. It has the numbers 7809 on
the device
-------------------------------------------
HTH
Phil
Phil Bader, Pres.
Jan Phyl TV Inc
Winter Haven, Fl
(863) 299-8821
estab. 1976
personal email: pbader@xxxxxxxxxxxxxxx
----- Original Message -----
From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
Date: Friday, October 28, 2005 4:48 pm
Subject: [TechAssist] Re: JVC AV32320 (HELP)vert problem need help
> I basically searched JVC vertical fixes:
> AV-3590S,Vertical FIX
> I've been away from shop for several days just now getting back to
> this JVC
> 6" wide expand at top of screen. AL marquate hit on the head it
> was the D421
> coming off of flyback, also replaced C423 100mfd, (high esr)
> thanks to all
> that replied.
> Darrell
> ---------------------------------
> AV-27920 27" TV, no vertical, FIX
> Black screen,turn up G2, just a line (no vert. deflection).
> Replaced the
> vert output IC421 (LA7832). Powered up and instantly smoked
> (literally)the IC.
> Further investigation found shorted zener diode D422 (75Volt,#
> MTZJ75-T2),weak capacitor C425 (470@35V) and C424 (100@35V) to
> cure the
> final symptom, retrace and top fold over.
> Remember to always test this zener (near the IC)for shorts, as
> this will
> destroy your new IC421.
> ----------------------------------------------
> JVC AV27920
>
> Vertical Deflection No Go - New Ic Fails Instantly
>
> Bryn Mawr Tv
>
> D422 (Mtzj75-T2) 75 Volt Zener Open Ic421 (La7832) C425
> (470mf/35v) And
> C424 (100mf/35v)
> -------------------------------------------------------
> HTH
> Phil
>
> Philip Bader
> Jan Phyl TV Inc.
> "Confounding the wise since 1976"
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
> personal/ alt. email: pbader@xxxxxxxxxxxxxxx
> see our ad at:
> http://jan-phyl-television-pc-monitor-
> service.9601288257006.worldpages-ads.com/
>
>
>
> John Conti wrote:
>
> >Terry, Just a thought, I don,t have a schem. on this but have you
> checked
> >the yoke return capacitor.
> >
> >John
> >Conti, TV
> >Texas
> >
> >
> >
> >
> >>From: "Terry J Hutchison" <sony1@xxxxxxxx>
> >>Reply-To: techassist@xxxxxxxxxxxxx
> >>To: techassist@xxxxxxxxxxxxx
> >>Subject: [TechAssist] Re: JVC AV32320 (HELP)vert problem need help
> >>Date: Fri, 28 Oct 2005 11:40:06 -0400
> >>
> >>What am I missing here?? I replaced d422 and d523 this produced
> 29vdc on
> >>pins 3&5 of IC421 and 15vdc on pin 2 I then replaced the IC
> again with
> >>absolutely no change in symptom on about 2 inchs of rastor in
> center of
> >>tube. I also replaced C523 1000@35 even tho it checked good.
> Sure would
> >>appreciate any advice. Windings on vert yoke read 9.3ohms.
> Thanks Terry
> >>
> >>Terry J Hutchison
> >>T&G TV Repair
> >>Kingsland GA.
> >>sony1@xxxxxxxx
> >>
> >>
> >>
> >>
> >>>[Original Message]
> >>>From: Eric Manuel <tvman@xxxxxxxxxxxxxxx>
> >>>To: <techassist@xxxxxxxxxxxxx>
> >>>Date: 10/19/05 2:24:46 PM
> >>>Subject: [TechAssist] Re: JVC AV32320 vert problem need help
> >>>
> >>>Terry I sent the wrong schematic I will send the right one
> next..Eric>>>
> >>>
> >>> Eric
> >>>E M Electronics
> >>>59 Wights Rd
> >>>Deer Lake NL
> >>>Canada
> >>>A8A 2J2
> >>>Ph# 709 635 2627
> >>>tvman@xxxxxxxxxxxxxxx
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>Terry J Hutchison wrote:
> >>>
> >>>
> >>>>I was able to download the file, but are these prints close
> enough to
> >>>>
> >>>>
> >>my
> >>
> >>
> >>>>chasis? Terry
> >>>>
> >>>>Terry J Hutchison
> >>>>T&G TV Repair
> >>>>Kingsland GA.
> >>>>sony1@xxxxxxxx
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>[Original Message]
> >>>>>From: Eric Manuel <tvman@xxxxxxxxxxxxxxx>
> >>>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>>Date: 10/19/05 11:33:42 AM
> >>>>>Subject: [TechAssist] Re: JVC AV32320 vert problem need help
> >>>>>
> >>>>>Hi Terry it,s a pdf file so it should open ok if you have
> Adobe 5 or 6
> >>>>>I will sent it again let me know if you get it ,,,Eric
> >>>>>
> >>>>>
> >>>>> Eric
> >>>>>E M Electronics
> >>>>>59 Wights Rd
> >>>>>Deer Lake NL
> >>>>>Canada
> >>>>>A8A 2J2
> >>>>>Ph# 709 635 2627
> >>>>>tvman@xxxxxxxxxxxxxxx
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>Terry J Hutchison wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Seems there was a problem with the upload I cannot download
> it here
> >>>>>>
> >>>>>>
> >>or
> >>
> >>
> >>>>at
> >>>>
> >>>>
> >>>>
> >>>>>>my home computer. Could you give it another try please.
Really
> >>>>>>
> >>>>>>
> >>>>appreciate
> >>>>
> >>>>
> >>>>
> >>>>>>the help. Terry
> >>>>>>
> >>>>>>Terry J Hutchison
> >>>>>>T&G TV Repair
> >>>>>>Kingsland GA.
> >>>>>>sony1@xxxxxxxx
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>[Original Message]
> >>>>>>>From: Eric Manuel <tvman@xxxxxxxxxxxxxxx>
> >>>>>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>>>>Date: 10/18/05 10:11:52 AM
> >>>>>>>Subject: [TechAssist] Re: JVC AV32320 vert problem need help
> >>>>>>>
> >>>>>>>Terry print coming to your email next .It,s 1.4 meg pdf..Eric
> >>>>>>>
> >>>>>>>
> >>>>>>> Eric
> >>>>>>>E M Electronics
> >>>>>>>59 Wights Rd
> >>>>>>>Deer Lake NL
> >>>>>>>Canada
> >>>>>>>A8A 2J2
> >>>>>>>Ph# 709 635 2627
> >>>>>>>tvman@xxxxxxxxxxxxxxx
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>Terry J Hutchison wrote:
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>This one is driving me crazy, I have approximately 2 inchs
> of
> >>>>>>>>
> >>>>>>>>
> >>rastor
> >>in
> >>
> >>
> >>>>>>center of screen. D422 feeds pin 2 of IC421(LA7841) and is
> providing>>>>>>
> >>>>>>
> >>>>15.80
> >>>>
> >>>>
> >>>>
> >>>>>>vdc to pin 2. D421 feeds pins 3 and six I have 37.1vdc on
> pin 3 and
> >>>>>>
> >>>>>>
> >>>>30.03
> >>>>
> >>>>
> >>>>
> >>>>>>on pin 6. Pin 1, .006, pin4, 2.6vdc, pin5, 2.6vdc and pin7,
> 8.95 vdc.
> >>>>>>
> >>>>>>
> >>I
> >>
> >>
> >>>>>>have checked all the electrolitic caps in the cir with my
> analyzer
> >>>>>>
> >>>>>>
> >>and
> >>
> >>
> >>>>all
> >>>>
> >>>>
> >>>>
> >>>>>>check good. I have changed the vert IC twice the last time
> with a
> >>>>>>
> >>>>>>
> >>known
> >>
> >>
> >>>>>>good LA7841. The B+ to pins 3 and 6 seems to high to me but
> with no
> >>>>>>
> >>>>>>
> >>>>prints
> >>>>
> >>>>
> >>>>
> >>>>>>I am just guessing. Appreciate any help. Terry
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>>Terry J Hutchison
> >>>>>>>>T&G TV Repair
> >>>>>>>>Kingsland GA.
> >>>>>>>>sony1@xxxxxxxx
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>
> >>>>>>
> >>-----------------------------------------------------------------
> -----------
> >>
> >>
> >>>>>>-
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
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