[TechAssist] Re: RCA PTK195B, mostly dead.

  • From: Kevin <kevintv@xxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 30 Jul 2004 12:39:06 -0700

I think it has a good picture.  I just brought in the light box--each
gun looks bright and proper.  

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx 
 

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Wayne Vanaman
Sent: Friday, July 30, 2004 3:41 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA PTK195B, mostly dead.

Kevin:

Look around the shields on the main board.  Make sure there are no
jumper
wires touching.  For that matter, look around to see if there are any
components "leaning agains" something else.

When it does come on, does it have a good picture.?


Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl.  32506-3310

Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com

850-456-5995 voice
850-458-6369 fax


----- Original Message ----- 
From: "Kevin" <kevintv@xxxxxxx>
To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 30, 2004 4:08 AM
Subject: [TechAssist] RCA PTK195B, mostly dead.


> This set works sometimes, but most times not.  When the set does work,
> it will work for a minute and then just shuts off by itself and will
not
> come on.  I have the SM on CD rom and I am following the trouble
> shooting procedure.  I found that when I monitor pin 19 of U13101
> (microprocessor) and press the power button, pin 19 does not go high
as
> it is supposed to.  The micro has 5 volts going to pins 16, 29, 32 and
> 51.  Pins 3 and 20 of U16201 are missing the required 7.5 volts.
After
> that the troubleshooting flowchart tells me to repair the defective
P/S
> source.  So I traced the missing voltage back to U14701, a dual
voltage
> regulator.  Pin 6 is missing 12 volts and pin 7 is missing 5 volts.
Pin
> 1 and 2 both have 18-20 volts which is good.  Pins 3 and 5 are
supposed
> to have the 5 volts from pin 19 of the micro when the set is on.  But
of
> course there is no 5 volts coming from the micro.  The set must be
going
> into shutdown.  What can I check next?  Thanks.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
>
>
>
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