[TechAssist] Re: PTK169PGA - Shutdown Problem
- From: "David" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 4 May 2005 18:56:00 -0400
Larry,
Thank-you! I removed the anode lead and the set fired-up. I can see the
heaters glow in all the tubes. Are these splitters hard to replace?
There looks like thermal paste or silicon paste on the lead I removed
from the splitter. Is it necessary to re-apply this paste again? Now to
source a splitter!
Again thanks,
David Lessard
Mr_fixit@xxxxxxxxxxxx
Alexandria, Ontario, Canada
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Larry E
Sent: Wednesday, May 04, 2005 5:08 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: PTK169PGA - Shutdown Problem
Dave, right where the anode lead goes into the splitter theres a small
plastic clip
that you have to gently pry outward and as you do that you pull on the
anode
lead and it will come right out, be carefull that you don`t lose the
small
rubber grommett
that slides over the anode lead, a lot of times it will stay inside the
tower of the splitter
you need to take it out if it does because you need to install it into
the
new splitter
or the lead will arc, once you remove the lead put it into a plastic or
ceramic cup
and try firing up the set, if it comes on and stays on then you`ve found
your problem,
it`s new hv splitter time, part # should be 205064. If the set doesn`t
come
up, re-post
and let us know what your standby voltages are at CR4116 and CR4118
(cold
ground) and pin 16 (hot ground) of U4101 the switchmode IC, this will
give
us a better idea of what`s going on with the set, hope this helps, Larry
E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "David" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, May 04, 2005 4:37 PM
Subject: [TechAssist] PTK169PGA - Shutdown Problem
> Hello Gentlemen,
>
> I haven't had the opportunity to work many of these units, in fact I
> think I repaired one before and it was a simple enough problem - open
> power resistor. This unit however is dead, well almost dead. When I
> press the PWR ON button I can hear the SMPS chirp and I can see the HV
> come-up but only for a fraction of a second then shutdown occurs. I
read
> something somewhere regarding the voltage-splitter. I need information
> on how to remove the FBT HV wire from the splitter without damaging
> anything. Also are there any other problems with this chassis which
> cause a shutdown condition? I did replace SMPS known bad caps (2.2uf -
> 15uf - 39uf) thinking perhaps I had a SMPS problem because I don't
hear
> the SMPS chirp at plug-in like the CTC177's and up, is it suppose to?
I
> also checked the HOT, SMPS diodes, etc., and couldn't find anything
> shorted.
>
> God bless you all and thank-you,
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
>
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