[TechAssist] Re: RCA PTK195B, mostly dead.

Agreed on the coolant items.............even though you fixed a few months
ago , if you did NOT pull the micro , EPROM and chipper check plug and clean
the leads and bottom of the parts and the board , you may be chasing your
tail here.

=================================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
(860)399-1861
(860)664-3535 FAX
jstielau@xxxxxxxx
=================================
----- Original Message ----- 
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 30, 2004 4:30 PM
Subject: [TechAssist] Re: RCA PTK195B, mostly dead.


> I did have coolant leakage several months ago, but after cleaning the
> board and changing R14110, the set worked fine for 4 months.  There is
> no coolant on the board now.  Thanks.
>
> I just plugged the set in, the P/S tweaked like it was ready to come on
> and found 5 volts on pin 19 of the micro, and 5 volts on pins 5, 6, and
> 8 of the eeprom.  Then of course as I as measuring these pins the
> voltages disappeared and the set was dead again.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Ohio Consumer
> Electronics
> Sent: Friday, July 30, 2004 1:05 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA PTK195B, mostly dead.
>
> Look real close for coolant around the micro-eeprom area.  Hard to see
> but
> only takes a couple drops to mess it up.  I had one of these 195's that
> was
> intermittent and that fixed it.  I had to remove the micro, eeprom and
> the
> keyboard and chipper-check sockets to clean under these components.
> Then
> the set came on and stayed on but it didn't have any menus because the
> eeprom was corrupted.  I replaced the eeprom and got the menu back but
> had
> to buy a chipper-checker to do the tuner alignment - what a nightmare
> that
> set was...
> Joel Jacobs
> Ohio Consumer Electronics
> Pickerington Ohi'o
>
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 30, 2004 3:09 PM
> Subject: [TechAssist] Re: RCA PTK195B, mostly dead.
>
>
> > I already unplugged the keyboard and it is still dead most of the
> time.
> > I did some more testing this morning and found that the eeprom
> (U13102)
> > has only 3 volts on pins 8 (Vcc) and 5 (clock).  Pin 6 (data) has 0
> > volts on it, instead of the normal 5 volts.  That certainly is not
> > normal.
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of tvservice
> > Sent: Friday, July 30, 2004 6:34 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [Tec'hAssist] Re: RCA PTK195B, mostly dead.
> >
> > Unplug the front panel keyboard see if operates OK with remote.
> > lift the 1K ohm resistor off micro to U14701 then plug in AC power you
> > should now always have +5 and +12 out of U14701
> > Set will not be on until press power,
> > I have seen this IC intermittent
> > also remove bottom tuner cover and carefully resolder every ground
> point
> > and
> > sm cap at ground points
> > Remove glue from micro crystal and resolder
> > If this set has dual tuners unplug cables to second tuner I have seen
> > problems on the second tuner assembly cause intermittent dead set.
> > hth
> > Robert
> > tvservice@xxxxxxxxxxxxx
> > H & H Electronics Inc
> >
> > ----- Original Message -----
> > From: "Kevin" <kevintv@xxxxxxx>
> > To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, July 30, 2004 4:08 AM
> > Subject: [TechAssist] RCA PTK195B, mostly dead.
> >
> >
> > > This set works sometimes, but most times not.  When the set does
> work,
> > > it will wo'rk for a minute and then just shuts off by itself and
> will
> > not
> > > come on.  I have the SM on CD rom and I am following the trouble
> > > shooting procedure.  I found that when I monitor pin 19 of U13101
> > > (microprocessor) and press the power button, pin 19 does not go high
> > as
> > > it is supposed to.  The micro has 5 volts going to pins 16, 29, 32
> and
> > > 51.  Pins 3 and 20 of U16201 are missing the required 7.5 volts.
> > After
> > > that the troubleshooting flowchart tells me to repair the defective
> > P/S
> > > source.  So I traced the missing voltage back to U14701, a dual
> > voltage
> > > regulator.  Pin 6 is missing 12 volts and pin 7 is missing 5 volts.
> > Pin
> > > 1 and 2 both have 18-20 volts which is good.  Pins 3 and 5 are
> > supposed
> > > to have the 5 volts from pin 19 of the micro when the set is on.
> But
> > of
> > > course there is no 5 volts coming from the micro.  The set must be
> > going
> > > into shutdown.  What can I check next?  Thanks.
> > >
> > > Kevin Wilks
> > > Kevin's TV & Video Repair
> > > Penticton BC Canada
> > > kevintv@xxxxxxx
> > >
> > >
> > >
> > >
> > >
> >
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