[TechAssist] Re: Fw: RCA CTC 187 menu disappears,volume works

  • From: Al L <alleathe@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Wed, 06 Jul 2005 14:56:34 -0400

Just discovered the 4.9 v on EEPROM6 and micro 19 are zero,even when I have 
menu,and zero after menu disappears and set locks up with pix and audio!

Al Leatherman
224 RT. 46
Mine Hill, NJ 07803
973-361-5796
WWW.ALS-TV.NET

----- Original Message ----- 
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, July 06, 2005 11:55 AM
Subject: [TechAssist] Re: Fw: RCA CTC 187 menu disappears,volume works


> Al, does the B+ stay firm on the eeprom and micro after the set warms up?
>
> Gary
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
>
>
>
>
>
> Al L wrote:
>> Thanks again Gary.I may have to use chipper checker,after i put in the 
>> other
>> parts,crystal first. i had a used crystal, but ordered a new one.Wayne V 
>> put
>> me on to checking the crystal,and the clock dies(goes flat)after a short
>> time,and the set plays with whatever was tuned in,no response from 
>> buttons
>> or remote.Thanks again.
>>     Btw, when cold,I get a good menu screen,but it never stays long 
>> enough
>> to get to auto program!
>>
>> Al Leatherman
>> 224 RT. 46
>> Mine Hill, NJ 07803
>> 973-361-5796
>> WWW.ALS-TV.NET
>>
>> ----- Original Message ----- 
>> From: "Gary McCartney" <gary@xxxxxxxxxxx>
>> To: <techassist@xxxxxxxxxxxxx>
>> Sent: Wednesday, July 06, 2005 9:09 AM
>> Subject: [TechAssist] Re: Fw: RCA CTC 187 menu disappears,volume works
>>
>>
>>
>>>Al, I did a check in my saved messages, and the one I had was a
>>>CTC197AK2. Here is what I had to say at the time:
>>>
>>>
>>>After I wrote the original message today, I had an idea. If I would
>>>install the new eeprom in the TV and then go to the menu and disable the
>>>front panel buttons, then save the eeprom file, I should be able to
>>>compare the factory set eeprom file with the menu-adjusted eeprom file.
>>>Yes, it showed that the only bytes in the eeprom that changed were
>>>various ones from address 0000 to 000F (the first row of 16 bytes). I
>>>then copied the factory set bytes from the above mentioned addresses to
>>>the customer's original data file. Programmed the eeprom and tried it.
>>>Didn't solve the problem. Then I noticed that some of the bytes in row
>>>two (addresses 0010 to 001F) of the customers file didn't match up with
>>>the factory set eeprom file. The last four bytes of the customer's file
>>>looked suspicious (addresses 001C, 001D, 001E, and 001F). They were:  FF
>>>FF FF FF. I copied the data from the factory set eeprom file (data was
>>>08 00 09 00) and reprogrammed the eeprom again. Installed it and the
>>>problem was now cured. The menu button on the front of the TV now works.
>>>I tested disabling it and re-enabling it in the menu and it works fine.
>>>I have connected my cable modulator to the set and I get clear sharp
>>>pictures all the way up to channel 79 which is the highest my modulator
>>>will tune. I haven't noticed any other functions not operating properly.
>>>
>>>
>>>
>>>Gary
>>>
>>>
>>>My first reply:
>>>
>>>Al, I had one like that and it was a corrupted byte in the eeprom.
>>>
>>>
>>>
>>>
>>>Gary McCartney
>>>
>>>McCartney Electronics
>>>Guelph Ontario Canada
>>>Est. 1984
>>>email: gary (at) number63.ca
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>Al L wrote:
>>>
>>>>PM
>>>>Subject: [TechAssist] RCA CTC 187 menu disappears,volume works
>>>>
>>>>
>>>>
>>>>
>>>>>I need to know if the micro and the T chip have their own separate 
>>>>>clocks
>>>>>or
>>>>>do they share one..
>>>>>  The remote and infra red pick up produce pulses at the input of
>>>>>micro,but when locked up,there seem to be no pulses on the clock pins 
>>>>>of
>>>>>the
>>>>>T chip,or micro.If I float the micro should I have clock pulses on one
>>>>>chip,
>>>>>the good one?
>>>>> The buttons on front fire up the set,do volume,and produce the
>>>>>menu.About
>>>>>the time I get to auto program,the menu disappears, and I am stuck with
>>>>>one
>>>>>channel.Sometimes it turns off.
>>>>> Any ideas,or does someone have an old training manual for this 
>>>>> set?TIA.
>>>>>
>>>>>Al Leatherman
>>>>>224 RT. 46
>>>>>Mine Hill, NJ 07803
>>>>>973-361-5796
>>>>>WWW.ALS-TV.NET
>>>>>
>>>>>
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