[TechAssist] Re: need factory programed eprom 223957
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 01 Feb 2006 23:04:37 -0500
An eeprom is either blank, or it is programmed. It may not have the
exact data in it that you want, but if there is any data at all, it has
been programmed (unless the data has been corrupted)
You can not call an eeprom that you buy from your RCA distributor which
already has some data in it, a blank eeprom, therefore it is a
pre-programmed eeprom. It is not blank- IT HAS DATA IN IT. It may not be
set exactly for your set, but it does have data in it, and thus NOT BLANK.
There are 3 distinctions of eeproms and many are getting confused here.
First, is the blank eeprom. A blank eeprom such as a 24C02, can be
bought at any electronics distributor for less than a dollar. There is
absolutely no data at all in that eeprom. All bits are set to
FFFFFFFFFFFFFFFFFFFFFFFFF. Does everyone understand this? This eeprom
can be installed in a video game, a camera, a phone, whatever. It will
do nothing until it is programmed for that particaular device.
Second, is the eeprom such as you purchase from your RCA distributor.
These have generalized settings within the stored data, which may or may
not make your TV operate correctly. The horizontal btye may need
tweaking, the channel frequency bytes may need adjusting to bring the
channels in etc. This is called a "pre-programmed eeprom, because it is
already programmed when you buy it.
Third, is the actual eeprom in a particular set. You have a CTC197 ABC
chassis, serial number AXZ777890. The data in this eeprom is set for
this set and this set only. The guy with the next serial number higher,
has to have an eeprom with slightly different data in it to make is
particular set work exactly right.
I hope this straightens out the confusion about blank or Not-Blank eeproms.
My original reply to this thread was referring to someone who mentioned
that the eeprom they bought from a distributor was blank which as I
explained is incorrect, unless the eeprom is defective.
Gary McCartney
McCartney Electronics
Guelph, Ontario Canada.
gulftech@xxxxxxxx wrote:
> Gary,
>
> I disagree, my friend.
>
> The RCA eeproms are programmed only with average values and must be
> "adjusted" or "tweaked" for each set. So called "preprogrammed" eeproms
> are the same way.
>
> One must go into the service menu and set the horizontal freq to start
> with. Then usually the vertical height and dc offset must be adjusted.
> Then maybe the bias and drives. Finally, the tuner parameters may need
> to be changed, since the ones I have seen have all settings in mid range.
> Even an eeprom from a working 187 may not work in another set because of
> circuit variances.
>
> For that reason, I don't have an eeprom programmer. I stock 30-40
> different eeproms. The OEM or "pre-programmed" will be closer, but there
> is still work to be done.
>
> HTH.
>
>
> Kenneth Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL 32563
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
> On Wed, 01 Feb 2006 15:15:01 -0500 Gary McCartney <gary@xxxxxxxxxxx>
> writes:
>
>>When you order an RCA eeprom such as your 223957 from your RCA
>>distributor, it is already programmed. Why do you think it isn't?
>>Perhaps you have a different problem, or maybe the eeprom you bought
>>is
>>defective. You can buy blank eeproms that are not programmed, but
>>they
>>are not going to have an RCA part number.
>>
>>I have a data file for the 223957 but you need an eeprom programmer
>>to
>>program it. I'm not sure if the data is for a factory stock eeprom
>>or
>>from a used set.
>>
>>
>>
>>
>>Gary McCartney
>>
>>McCartney Electronics
>>Guelph Ontario Canada
>>Est. 1984
>>email: gary (at) number63.ca
>>
>>
>>
>>
>>
>>
>>
>>
>>R. Sue Robinson wrote:
>>
>>>hoping someone out there can help! Tom is looking for
>>>a factory programed eprom for model 31gt671, chassis
>>>ctc187j-v, loc. u3201
>>>part number for that location is 223957 but when
>>>ordered does not work because it is not programmed.
>>>Does anyone know how we get a factory programmed
>>>eprom?
>>>Sue (from)
>>>TOM THE TV MAN, INC.
>>>2028 N.TELEGRAPH RD.
>>>DEARBORN MI 48128
>>>313 565-6100
>>>
>>>__________________________________________________
>>>Do You Yahoo!?
>>>Tired of spam? Yahoo! Mail has the best spam protection around
>>>http://mail.yahoo.com
>>>
>>
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