[TechAssist] Re: CTC203CH3 RCA CHASSIS
- From: Alvin Rose <ajroseca@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 21 Oct 2005 21:11:34 -0230
Hello Wayne
The set is a RCA model F32665
it is a CTC203CH3 chassis 32 inch screen.
Alvin
Wayne Vanaman wrote:
>Alvin:
>I looked all over the Thomson web site and didn't see anything that
>looked like it pertained to this. I just don't know what to look for.
>
>Please get the full model/service number. There are sooo many
>variations of this, the ch3 does narrow it down some, probably enough,
>But, Murphy's Law applies.
>
>I will be in early tomorrow, and then probably early Sunday morning.
>
>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
>
>
>Alvin Rose wrote:
>
>
>>Hello Wayne
>>I understood there is a modification for the problem
>>on the Thompson web site but I don't have the url or password
>>for technical support there..I will do the checks as per your
>>instructions to isolate the problem. I am wondering if there
>>is a way to bypass the PIP function..I have to use the board
>>as the audio and video inputs are on it Otherwise there is a
>>plug in jumper available to take it out ..Thanks for the info
>>it is much appreciated.
>>Alvin
>>Wayne Vanaman wrote:
>>
>>
>>
>>
>>>Alvin:
>>>I have no idea what Lindsey is talking about. I don't know anything
>>>about a "power on reset" repair.
>>>
>>>On these sets (and most RCAs) at plug in the micro inventories the
>>>chassis to determine which audio functions, PIP functions, convergence
>>>functions, etc, are installed on the chassis. The micro then knows
>>>which menus to enable.
>>>
>>>If the set operates without the PIP module installed it would indicate a
>>>faulty PIP circuit. These jumpers mentioned are simply passing the
>>>video thru the absent pip module.
>>>
>>>The primary suspect would be the PIP processor, u18100 248620 $42 cost.
>>>
>>>Scope the clock and data lines. At plug in there should be a burst of
>>>activity that ceases. If the activity continues the set will not turn on.
>>>
>>>You can do the next two steps in either order.
>>>
>>>1. Desolder pins 26 and 27, clock and data respectively, of PIP
>>>processor U18100. Check for data activity that ceases. See if the set
>>>comes on. You probably will not have a picture. If so, this chip is
>>>probably bad.
>>>
>>>2. Pin 26 of IC18100 is data out. It feeds SMD Q18102 which couples to
>>>Q18101 the data buffer to the PIP data input. If this transistor is
>>>faulty it can cause a dead set, and you probably did not have good data
>>>pulses on pin 27. Remove the transistor and if the set comes on,
>>>probably with no picture as the PIP processor has not answered the
>>>micro, this transistor is bad.
>>>
>>>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
>>>
>>>
>>>Alvin Rose wrote:
>>>
>>>
>>>
>>>
>>>
>>>>Hi Lindsay
>>>>You were correct about the test..
>>>>I installed the jumpers and set worked ok
>>>>however I can not find any information to
>>>>fix the problem can you advise how to do it.
>>>>Alvin
>>>>
>>>>Lindsey Altman wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Hi,
>>>>>
>>>>> Do a "power on reset" test. Remove the PIP module. It's the first =
>>>>>one
>>>>>beside the tuner. On connector J12101, the farthest one looking into the
>>>>>board, jump pins 3, 7, & 9 together. Also jump pins 5, 6, & 8 together. =
>>>>>Test
>>>>>unit for normal operation. If this test is a success, from the Thomson
>>>>>website do the modifications to repair the power on reset circuit. =
>>>>>Someone
>>>>>else will have to send you that service bulletins my send is broken.
>>>>>
>>>>> HTH,
>>>>> Lindsey
>>>>>=20
>>>>>
>>>>>Lindsey Altman
>>>>>At Home Service Company
>>>>>440 Cedar Ave.
>>>>>Claxton, Georgia 30417
>>>>>912-739-1019
>>>>>athomeservice@xxxxxxxxxxxxx
>>>>>
>>>>>
>>>>>-----Original Message-----
>>>>>From: techassist-bounce@xxxxxxxxxxxxx
>>>>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Alvin Rose
>>>>>Sent: Friday, October 07, 2005 2:59 PM
>>>>>To: techassist
>>>>>Subject: [TechAssist] CTC203CH3 RCA CHASSIS
>>>>>
>>>>>We have a RCA CTC203CH3 which goes
>>>>>into shutdown after one second..The base waveform of
>>>>>the output transistor looks ok and the high voltage
>>>>>comes up to 23 kv for a second..Output transistor
>>>>>and scanning diode checks ok..B plus is 134 volts
>>>>>on flyback..Any help with this unit would be greatly
>>>>>appreciated.
>>>>>Alvin Rose
>>>>>Radio & Tv Centre
>>>>>Marystown, Nl
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