[TechAssist] Re: ATC311 Sweep board component level repair.
- From: walter wood <wwood_38478@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 5 Nov 2003 14:30:42 -0800 (PST)
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
> > >
> > >__________________________________
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=====
Walter Wood
Future Tech Home Center
2786 Hwy. 43 N.
Lawrenceburg Tn. 38464
931-829-3337
Fax 931-829-4044
mailto:wwood_38478@xxxxxxxxx
__________________________________
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