[TechAssist] Re: CTC203CH3 RCA CHASSIS
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 22 Oct 2005 05:22:19 -0500
Wayne, take a look at the top service bulletin for this model in
PartsFinder, TV00-003, maybe that is the one.
The Old Master Technician
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
Alvin Rose wrote:
> 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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