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

  • From: <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 4 Sep 2003 13:50:39 -0500

Data from the micro turns on the horizontal drive from T chip
Sounds like your T chip is bad
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX
----- 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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> > > >(tvservice@xxxxxxxxxxxxx@67.66.169.89 with login)  by
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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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