[TechAssist] Re: ATC311 Sweep board component level repair.
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 6 Nov 2003 11:27:25 -0600
New TCE bulletin today, Sencore has the adaptors for the atc311, I just
ordered on. And got a call on a 65" unit I'm gonna pick up this afternoon.
Convergence problem. I changed the splitter in it Sept 11, aligned the
convergence in all modes and it was good then...
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
----- Original Message -----
From: "walter wood" <wwood_38478@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 05, 2003 4:30 PM
Subject: [TechAssist] Re: ATC311 Sweep board component level repair.
> Interesting,
> The schematic for the convergence board shows 4
> eeproms, U19510 through U19513.
> Parts Finder cannot find U19510 and U19513.
> IT does give the same part no. for U19511 and
> U19512, and calls them EEproms.
> It's the same eeprom used in the CTC211, DTC307,and
> MMC102.
> How can one reset this to the default?
> Is it advisable to do that?
> Thanks
> Walter
>
> --- Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
> wrote:
> > Actually the convergence is stored in a couple of
> > eeproms. On these sets
> > there is a default convergence in one eeprom
> > which can be loaded into
> > another "working" eeprom. With a convergence
> > problem you would normally be
> > able to align the convergence and get a good
> > picture. At that point you
> > would have the wise option to store that data to
> > the default eeprom. If you
> > do not store the data to the default eeprom the
> > set will work until the
> > customer does the autoconvergence, even if power
> > has been out awhile.
> >
> > For the set to have a "non-correctable"
> > convergence problem would entail
> > more than one eeprom. I currently have a
> > convergence pcb on order for a
> > customer. On his set the 480i and 480p
> > convergence data could be stored,
> > but the 1080i data could not be stored.
> >
> > I have only repaired a half a dozen of these, and
> > this is the only one I
> > have had a convergence problem with. Initially
> > after replacing a badly
> > burned circuit board the set would not converge.
> > Replacing the eight
> > convergence sensors solved part of that.
> >
> > This may also turn out to be an interesting
> > finish as the owner of this set
> > is one of three co-owners of a company that
> > supplies parts to RCA, and I
> > have fixed one of the owners sets, and looking
> > forward to meeting the
> > third...while this repair is dragging along...
> >
> > As a side note, this high voltage splitter is
> > mounted in the same trashy way
> > as the ptk195s, and I have seen arcing between
> > the chassis ground and the
> > splitters ground plate when the mounting screw is
> > not tight. I always add a
> > jumper wire from the splitter ground lug to the
> > chassis. I noticed that the
> > ATC221 chassis also have a ground jumper
> > installed.
> >
> > Wayne Vanaman
> > Omega Electronics
> > 6904 W Fairfield Dr
> > Pensacola, Fl. 32506-3310
> >
> > Wayne@xxxxxxxxxxxxxxxxxxxxx
> > WWW.PensacolaTVRepair.Com
> >
> > 850-456-5995 voice
> > 850-458-6369 fax
> >
> >
> > ----- Original Message -----
> > From: "peggs" <peggs@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>; "Tech Assist"
> > <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, November 05, 2003 2:23 PM
> > Subject: [TechAssist] Re: ATC311 Sweep board
> > component level repair.
> >
> >
> > > Isn't the convergence 'stored' in an EEprom ???
> > > Maybe it got zapped on the original/component
> > repair module
> > >
> > > Peggs
> > >
> > > At 09:51 AM 11/5/03, walter wood wrote:
> > > >Jason at Excel was kind enough to provide some
> > > >extra input on the HV splitter issue in the
> > ATC311
> > > >thomson chassis.
> > > >Reference Thomson bulletin TV-03005.
> > > >I've had 8 of these things and on 5 of them
> > > >replacing the splitter and R14705 238958 27k
> > common
> > > >1/2 watt resistor repaired the sets.
> > > >When the power/sweep board is
> > replaced(according to
> > > >Thomson tech support), the geometry and
> > convergence
> > > >must be set.
> > > >That's a bear, as I still don't have the
> > adaptor
> > > >for Chipper Check to do this.
> > > >So, I tried the component level fix.
> > > >The extra parts are:
> > > >R14718 260880 120K 1/4 watt
> > > >R14718 175046 30K 1/4 watt
> > > >CR14703 198589 diode
> > > >Q14401 243834 2sc5522 transistor.
> > > >On this particular set R14718 and Q14401 were
> > the
> > > >only other failed components. I did replace
> > all six
> > > >however.
> > > >
> > > >This repaired the set, BUT, the convergence is
> > off
> > > >exactly as the complete module I replaced.
> > > >I've done both,module and component repair on
> > this
> > > >set in order to answer some questions, but I
> > only
> > > >got more questions.
> > > >Apparently, it's not the changing of the
> > > >power/sweep/back end processor, that causes
> > the
> > > >convergence problem.
> > > >So, the splitter's arcing must damage another
> > > >board.
> > > >Any ideas??
> > > >TIA
> > > >Walter
> > > >
> > > >=====
> > > >Walter Wood
> > > >Future Tech Home Center
> > > >2786 Hwy. 43 N.
> > > >Lawrenceburg Tn. 38464
> > > >931-829-3337
> > > >Fax 931-829-4044
> > > >mailto:wwood_38478@xxxxxxxxx
> > > >
> > > >__________________________________
> > > >Do you Yahoo!?
> > > >Protect your identity with Yahoo! Mail
> > AddressGuard
> > > >http://antispam.yahoo.com/whatsnewfree
> > >
> >
>
>***************************************************************************
> > **
> > > >Classifieds! Buy or Sell!
> > > >http://sell.tech-assist.org
> > > >The Tech Address Book:
> > >
> >
> >http://www.tech-assist.org/secure/tip/contact.htm
> > > >Add a Repair Tip Here, or Change/Remove your
> > Email Address:
> > > >http://www.tech-assist.org/secure/tip/main.htm
> > > >Lost Password:
> > > >http://www.tech-assist.org and select "Lost
> > your Login Info?".
> > > >Email Archives:
> > > >//www.freelists.org/archives/techassist/
> > >
> > >
> >
>
****************************************************************************
> > *
> > > Classifieds! Buy or Sell!
> > > http://sell.tech-assist.org
> > > The Tech Address Book:
> > >
> > http://www.tech-assist.org/secure/tip/contact.htm
> > > Add a Repair Tip Here, or Change/Remove your
> > Email Address:
> > > http://www.tech-assist.org/secure/tip/main.htm
> > > Lost Password:
> > > http://www.tech-assist.org and select "Lost
> > your Login Info?".
> > > Email Archives:
> > > //www.freelists.org/archives/techassist/
> > >
> >
> >
>
****************************************************************************
*
> > Classifieds! Buy or Sell!
> > http://sell.tech-assist.org
> > The Tech Address Book:
> > http://www.tech-assist.org/secure/tip/contact.htm
> > Add a Repair Tip Here, or Change/Remove your
> > Email Address:
> > http://www.tech-assist.org/secure/tip/main.htm
> > Lost Password:
> > http://www.tech-assist.org and select "Lost your
> > Login Info?".
> > Email Archives:
> > //www.freelists.org/archives/techassist/
>
>
> =====
> Walter Wood
> Future Tech Home Center
> 2786 Hwy. 43 N.
> Lawrenceburg Tn. 38464
> 931-829-3337
> Fax 931-829-4044
> mailto:wwood_38478@xxxxxxxxx
>
> __________________________________
> Do you Yahoo!?
> Protect your identity with Yahoo! Mail AddressGuard
> http://antispam.yahoo.com/whatsnewfree
>
****************************************************************************
*
> Classifieds! Buy or Sell!
> http://sell.tech-assist.org
> The Tech Address Book:
> http://www.tech-assist.org/secure/tip/contact.htm
> Add a Repair Tip Here, or Change/Remove your Email Address:
> http://www.tech-assist.org/secure/tip/main.htm
> Lost Password:
> http://www.tech-assist.org and select "Lost your Login Info?".
> Email Archives:
> //www.freelists.org/archives/techassist/
>
*****************************************************************************
Classifieds! Buy or Sell!
http://sell.tech-assist.org
The Tech Address Book:
http://www.tech-assist.org/secure/tip/contact.htm
Add a Repair Tip Here, or Change/Remove your Email Address:
http://www.tech-assist.org/secure/tip/main.htm
Lost Password:
http://www.tech-assist.org and select "Lost your Login Info?".
Email Archives:
//www.freelists.org/archives/techassist/
Other related posts:
