[TechAssist] Re: partial fix,RCA P46811LV, PTK195AA bowed, jagged buzzing pix after home power flickered

  • From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 22 Jul 2005 09:55:18 -0500

Phil:

The convergence power supply output 4 voltages, and I have seen the Ic fail.

As for the eeprom, this set has a separate convergence eeprom and you 
don't want to do a complete alignment.  I have never seen the 
convergence eeprom bad.

With no power supply on the convergence board the menu choice under 
screen for "adjust projection tv" will not be there and you will of 
course not have any convergence correction nor will you be able to do 
any convergence adjustments.

The service adjustments for convergence are on parameter/value 80.

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


Phil Bader wrote:
> A quick check of the converg. power supply board showed only a few volts 
> output, so I ordered another STK730 IC for that module.BTW If I unplug 
> that AC wire/plug from the main board that plugs into the conv. power 
> supply (delivers the 120VAC) the geometry is unchanged, so with or 
> without the conv.PS even powered,same look? I think the STK is it. Will 
> install and see.This is a likely suspect since it started with power 
> outtages. You are right, it could be a corrupt eeprom. If so, I can 
> basically just go into the service menu and do a converg. alignment back 
> where it belongs without replacing the eeprom? When we say "corrupted 
> eeprom" it really means some of the values changed,thereby affecting 
> that parameter,I ASS-U-ME!
> ;-)
> Thanks for the help.
> Phil
> 
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
> personal/ alt. email: pbader@xxxxxxxxxxxxxxx
> see our ad at:
> http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.com/
> 
> 
> 
> Damon wrote:
> 
> 
>>Did you check the Convergence Power supply to see if it was running? Can you
>>adjust anything in the Convergence circuit? BTW I think the Convergence
>>board BOWS only the top and bottom of the picture when the power supply
>>shuts off.......I think I've had a couple of these units intermittantly turn
>>itself off, and the price of the board was cheaper than spending hours
>>identifying the intermittant.
>>
>>I think I'd check for adjustability and EEprom storage capability
>>first....pick a grid point, adjust it out of specs a little, store it, then
>>back out (use only one out of 3 colors, keep a reference color). Go back in
>>and see if it "remembers", if so, then the EEprom most likely just lost it's
>>DATA.
>>.....and you don't have to invest in a new Conv Board. But if it needs one,
>>you will RUE the day all manufacturers started putting the sensors on the
>>edges of their screens. Getting "green-OK" is a pain.
>>
>>Damon B
>>Telrad Electronics
>>Fort Wayne IN
>>----- Original Message ----- 
>>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Thursday, July 21, 2005 3:25 PM
>>Subject: [TechAssist] partial fix,RCA P46811LV, PTK195AA bowed, jagged
>>buzzing pix after home power flickered
>>
>>
>> 
>>
>>
>>>Partial fix. The jagged picture looked like arc, so I reseated the HV
>>>input lead to the HV Splitter block.Then it cleared up.That was it. Now
>>>the bowed display. Since the bow happened after multiple power
>>>outtages,think the eeprom got corrupted?
>>>Phil
>>>
>>>Philip Bader
>>>Jan Phyl TV Inc. (estab. 1976)
>>>3420 Recker Hwy. Winter Haven, Fl. 33880
>>>Fax (863) 299-8821
>>>email: tjanphyl@xxxxxxxxxxxxxxx
>>>personal/ alt. email: pbader@xxxxxxxxxxxxxxx
>>>see our ad at:
>>>
>>>   
>>>
>>
>>http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.com/
>> 
>>
>>
>>>Phil Bader wrote:
>>>
>>>   
>>>
>>>
>>>>Customer said the house power failed 4 times. After that the set looked
>>>>this way. I can make out the OSD and tuner video and sound, but the
>>>>picture js very bowed, distorted with a kind of "christmas tree
>>>>jaggedness. I was thinking the main power supply was faulty. I unplugged
>>>>the main AC wires to the converg. power supply board but same. ALSO!:
>>>>The screen G2 wire let go from inside the fly.Looks like a small peice
>>>>is still in there. Am I screwed there?
>>>>Phil
>>>>
>>>>
>>>>
>>>>     
>>>>
>>>
>>>--------------------------------------------------------------------------
>>>   
>>>
>>
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