[TechAssist] Re: JVC AV32320 (HELP)vert problem need help
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 28 Oct 2005 16:48:51 -0400
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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