[TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead

  • From: "Mouton's Electronics" <moutons@xxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 4 Sep 2003 12:55:23 -0500


Yes, the Tchip needs data and clock to turn on drive, but if you get a high
on the pads of the clock and data that means that there more than likely
isn't a leakage problem on the bus. Next disconnect the clock and data
inputs to other chips ie... the stereo decoder, fpip, guide plus, and such
one at a time with the micro and dual regulator reconnected and try to turn
on the set. If is comes on with one of the ic's disconnected that ic is
disturbing the bus. It is a real pain but it works.

Also, with pin 3&4 connected, if I remember correctly, and the dual
regulators enable line still disconnected try to turn the set on. If is
comes on that means the data is good but the micro is shutting down due to a
disturbance on the bus. The set uses data to turn on drive but a loss of the
12v supply is what turns the drive off. TO TURN THE SET ON YOU MAY HAVE TO
FORCE IT ON WITH THE KEY BOARD: do this by going into the service mode while
the set is off. Power, menu, and vol up.

Jason
Mouton's Electronics


----- Original Message ----- 
From: "Richard La Placa" <continentaltv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 04, 2003 4:00 PM
Subject: [TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead


> Hi
>  When I disconnect pin 3 & 4 on micro I get 4.8 volts at the pads. When I
> reconnect them I dont get anything. Can a bad T chip cause this? Does it
> need the bus& data from the micro to produce any horiz & vert?I have
> voltages on the la7612. I have4.8 volts at the bus & data lines there ,
but
> when I re-connect pin 3&4 on micro they dissapear.
> Tia
> Richard La Placa
> Continental TV
> 312a Park Row
> Chestertown, Md.
> fax&phone-410-778-1113
> website: http://www.continentaltv.homestead.com/
> continentaltv@xxxxxxxxxxx
> ----- Original Message -----
> From: "Mouton's Electronics" <moutons@xxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, September 03, 2003 1:07 PM
> Subject: [TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead
>
>
> > Try disconnecting the trigger to the dual voltage regulator (5/12v reg)
so
> > that the regulator will stay on then disconnect pin 3&4 on the micro
(the
> > run clock and data) plug in and press the power. If the set comes on you
> > have something pulling down the run clock and data lines. You can
> reconnect
> > pin 3&4 then disconnect the clock and data to each IC one at a time and
> try
> > the set, if it comes on then change that IC. As long as these lines stay
> low
> > the set will never run.
> >
> > I have tried to keep up with this thread to get new info and hope noone
> > suggested this already, sorry if this is redundant.
> >
> > Hope this helps
> >
> > Jason
> > Mouton's Electronics
> >
> > ----- Original Message -----
> > From: "Richard La Placa" <continentaltv@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, September 03, 2003 12:21 PM
> > Subject: [TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead
> >
> >
> > > Hi
> > > I applied 5 volts to pin 5 of IC 14701 and got 5 & 12 volts out , but
> the
> > > set still wont come on.Pin 19 on micro is still dead. cant see any
> > > corrossion.Get a little pop from speakers when first  plugged in and
> after
> > a
> > > little while after it is unplugged you can hear another little pop,
like
> a
> > > shutdown circuit is releasing.I guess I'm really stuck on this one.
Does
> > > anybody know of an rca tech line a non asc can call?
> > >
> > >
> > >
> > > Richard La Placa
> > > Continental TV
> > > 312a Park Row
> > > Chestertown, Md,21620
> > > Fax&Phone-410-778-1113
> > > continentaltv@xxxxxxxxxxx
> > >
> > >
> > >
> > >
> > >
> > > >From: <tvservice@xxxxxxxxxxxxx>
> > > >Reply-To: techassist@xxxxxxxxxxxxx
> > > >To: <techassist@xxxxxxxxxxxxx>
> > > >Subject: [TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead
> > > >Date: Tue, 2 Sep 2003 09:12:03 -0500
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> > > >
> > > >+153 volts in standby is normal
> > > >Unsolder R14708 on front of main board (labeled R708 on board)
> > > >then in standby measure for +5 and +12 at pins 6 and 7 of IC14701
> > > >if missing eithe replace IC14701 or look for load on these pins
> > > >Also look very carefully around eeprom and micro for coolant leakage
> > > >Had this last week finally removed chipper check service connector
from
> > > >board found corrosion underneath
> > > >Robert
> > > >tvservice@xxxxxxxxxxxxx
> > > >H & H Electronics Inc
> > > >Dallas, TX
> > > >----- Original Message -----
> > > >From: "Richard La Placa" <continentaltv@xxxxxxxxxxx>
> > > >To: <techassist@xxxxxxxxxxxxx>
> > > >Sent: Tuesday, September 02, 2003 8:48 AM
> > > >Subject: [TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead
> > > >
> > > >
> > > > > Hello everyone,
> > > > > I am still in the dog house on this one.
> > > > > I changed the micro & eprom and still no go. Can anybody tell be
> what
> > > >the
> > > >B+
> > > > > should be in the standby condition? I have 153.4 volts at the hot.
I
> > > >tried
> > > >a
> > > > > 40 watt bulb for a load and get 140 volts there, but all other
> voltage
> > > > > supplies are still high. Can this cause the micro to lock up?
> > > > > tia
> > > > >
> > > > > Richard La Placa
> > > > > Continental TV
> > > > > 312a Park Row
> > > > > Chestertown, Md,21620
> > > > > Fax&Phone-410-778-1113
> > > > > continentaltv@xxxxxxxxxxx
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > >From: <tvservice@xxxxxxxxxxxxx>
> > > > > >Reply-To: techassist@xxxxxxxxxxxxx
> > > > > >To: <techassist@xxxxxxxxxxxxx>
> > > > > >Subject: [TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead
> > > > > >Date: Thu, 28 Aug 2003 14:27:44 -0500
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> > > > > >
> > > > > >Sounds like a bad micro to me
> > > > > >Robert
> > > > > >tvservice@xxxxxxxxxxxxx
> > > > > >H & H Electronics Inc
> > > > > >Dallas, TX
> > > > > >----- Original Message -----
> > > > > >From: "Richard La Placa" <continentaltv@xxxxxxxxxxx>
> > > > > >To: <techassist@xxxxxxxxxxxxx>
> > > > > >Sent: Thursday, August 28, 2003 1:56 PM
> > > > > >Subject: [TechAssist] RCA Mod#P46813BL, CH# PTK195AA-dead
> > > > > >
> > > > > >
> > > > > > > Help???
> > > > > > >  When I unsolder pin 23 & pin 24 on micro.(U13101) I get real
> good
> > > >clock
> > > > > >&
> > > > > >data pulses coming out, but the DC voltages are low.The DC
voltage
> on
> > > >the
> > > > > >pads is 4.9 volts , but when I reconnect, I only get 1.6 volts on
> pin
> > > > > >23(data) & 2.29volts on pin 24(clock). The micro seems to be
> holding
> > > >the
> > > > > >voltage down.I don't have anything coming out of pin
> 19(run/stby).The
> > > >micro
> > > > > >costs $49.00, and I am trying to make sure it is really bad
before
> I
> > > >get
> > > >a
> > > > > >new one. I dont see many of projection sets here and won't need a
> > spare
> > > > > >micro if this is still good.
> > > > > > > Any help greatly appreciated
> > > > > > > Richard La Placa
> > > > > > > Continental TV
> > > > > > > 312a Park Row
> > > > > > > Chestertown, Md.
> > > > > > > fax&phone-410-778-1113
> > > > > > > website: http://www.continentaltv.homestead.com/
> > > > > > > continentaltv@xxxxxxxxxxx
> > > > > > >
> > > > >
> > > >
> >
>
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