[TechAssist] Re: RCA P46730WK PTK169PCA slow to turn on
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 21 Jun 2005 13:04:42 -0400
pin 16 is 11.3v in stby
B+ is 143.4
pin 3 is .05v
Seems to be working now. Changed a couple more caps, I think c4705 (680uF
35v) is the one that fixed it. Looks like it is in the H drive circuit, 25v
supply. I'll change the caps near the micro that you suggested just to be
sure, though they don't look leaky.
Thanks, guys.
Leonard Caillouet
Electronics World
1261 NW 76 Blvd
Gainesville, FL 32606
352-332-5608
352-332-5668 fax
----- Original Message -----
From: "Larry E" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, June 21, 2005 12:37 PM
Subject: [TechAssist] Re: RCA P46730WK PTK169PCA slow to turn on
Leonard, sounds like the run B+ is going too high when the set initially
starts, do
you have a steady 10.5 volts on pin 16 of U14101 in standby? monitor the
standby B+ at cathode of CR4116 (right side of flyback) with a full 120
volts applied,
should be approx. 143 volts, if so, turn set on with meter attatched to
cathode and see if the B+ is going real high,
usually 170-200 volts, if so pin 3 of U14101 is probably going higher than
.9 volts
which is an indication of shutdown, check the area around the small blue
crystal to
see if it`s wet (at end of U1001), electrolytic cap next to crystal leaks
and can cause hard start.
I`ve got the print and the training manual if you get stuck, we all know how
many things can
cause this chassis to not start, hth, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, June 20, 2005 1:51 PM
Subject: [TechAssist] RCA P46730WK PTK169PCA slow to turn on
> This one will power up and run fine, unless it is cold and the a.c. line
> voltage is over 112 volts. Below that it works. Over that it is very
slow
> to start when the remote power is pressed, and sometimes will not start at
> all. PS has been rebuilt with all of the typical components, the primary
4
> caps and chip, and CR4118 and its cap in the sec. The 5v standby reg
> transistor and the 12 volt run transistor (this one was keeping the run
> voltage low) were changed. There was goo from the rubber spacers melting
in
> the PIP module but this seemed to not affect anything.
>
> Any ideas on slow start issues?
>
> Leonard Caillouet
> Electronics World
> 1261 NW 76 Blvd
> Gainesville, FL 32606
> 352-332-5608
> 352-332-5668 fax
>
>
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