[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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