[TechAssist] Re: CTC203CH3 RCA CHASSIS
- From: Alvin Rose <ajroseca@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 21 Oct 2005 20:32:27 -0230
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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