[TechAssist] Re: *Fixed* RCA P52812AB(PTK195AB)Dead..Was conver. issue
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 3 Feb 2004 13:07:11 -0500
After replacing the convergence chip and resistor, the unit was dead. I removed
the main board from the
convergence board and the unit had a rapid click sound. I connected parts of
the convergence and yokes a
little at a time to rule out a CRT or yoke problem or convergence board
problem. After getting the
convergence board connected again, the set came on with HV. I continued to
connect the yokes, CRTs, etc
and after all was connected the set came on and the set worked.
Don't have an answer, though I am curious if maybe the convergence EEPROM was
corrupt and got reset?
I did make an attempt to reset the main EEPROM my grounding pin 8 originally,
but that didn't help.
Delivered light box, checked with the customer after two days and set worked
fine.
Ideas?
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Friday, January 30, 2004 9:56 AM
Subject: [TechAssist] TA RCA P52812AB(PTK195AB)Dead..Was conver. issue
I had a call originally on this for convergence going out after 30-60 minutes.
Replaced STK IC U19700 and
open R19233 (15K-3w). After replacing these, the set is dead...I double checked
every connector many times
and can not find the problem.
S/B voltages seem find(no print)..Best I can do from my notes is, pin 5 of
micro has 2.5v, press power,
goes to 0 v.
U14701 has B+, but 0v on either output. Replaced and still 0v..I disconnected
the output from circuit and
still 0v, replaced, same problem..
I measured these pins as I pressed power and the 5 volts for the output comes
up, but the 12v goes to a
couple volts, then to 0.
I've tried the troubleshooting guides, with no luck...or they don't apply to
this set.
I am still at a loss what could have happened from the time I ordered these
convergence parts and replaced
them..any ideas?
Thank you.
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
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