[TechAssist] Re: CTC203CH3 RCA CHASSIS
- From: Bill Grabowski <bgrabowski@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 21 Oct 2005 17:26:42 -0500
I perused the section on CTC203 and found nothing ona power on reset fix.
--
**********************
Bill Grabowski
Triangle Appliance
3813 Roosevelt Rd
Kenosha WI 53142
262-694-6500
262-694-6523 fax
bgrabowski@xxxxxxxxx
**********************
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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>>>>
>>>>
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