[TechAssist] Re: PTK195KB convergence off/not there
- From: "tvservice" <tvservice@xxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 6 Nov 2002 10:04:35 -0600
remove convergence yokes plugs 1 at time, power up see if +/-15 and +/-45
stay then plug back in 1 at time till see which one shuts down P/S
which ever yoke plugged in that caused P/S to shutdown is problem
if no +/-15 and +/-45 with all three conv yokes loose trouble shoot P/S
If this model uses stk730-xxx have seen it intermittent also surface mount
cap on both model check C19706 leaky replace with 239176 820pf chip
and replace al 4 secondary rectifiers may check good but will break down
under load. Usually just missing 1 of the +/- voltages though.
hth
Robert
tvservice@xxxxxxxxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Larry E." <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 06, 2002 9:31 AM
Subject: [TechAssist] PTK195KB convergence off/not there
>
> Hi guys, RCA PTK195KB, convergence way off, picture has the usual bow,
> didn`t have schematic on the truck, set had 1.2 volts on positive 15v
> line, -2.2 on -15v line, 26v line is good. Pulled both 15v diodes and
> they both checked good, pulled R19722 750K resistor it also reads good.
> Tried to pull up crosshatch in customer menu and it will come up 1 time
> out of 10 try`s,when it did come up I tried to move the blue and the set
> momentarily shuts down, when it comes up it`s out of the menu mode
> alltogether and then the convergence mode is no longer there. I shut the
> set off for approx. 10 minutes to check components/solder on conv. power
> board and when I powered the set back up the convergence was ok, +15/-15
> were both there, 3-4 minutes later the convergence went back out and
> both 15v lines were gone again. No bad solder, no burnt parts, heatsinks
> on convergence board are of course cold, all plugs plugged in. Going
> back this afternoon with schematic, anybody seen this problem ?? tia,
>
> --
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl.
> http://www.tvjunkyard.com
>
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