[TechAssist] Re: Samsung TV - TXE2749 - KCT52A - EPROM Question
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 03 Apr 2005 15:02:28 -0400
David, I haven't been following this thread. Just wondering if the
remote sensor could be keeping the micro busy, or maybe a leaky tact
switch?. Also, what is the number on the micro IC? I can have a look at
my scrappers on Monday.
Gary
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
David Lessard wrote:
> Jonas,
>
> No swapping the EPROM made no difference. Further experimenting revealed
> that when SCL (IC901-37) clock and (IC901-42) SDA data lines are
> disconnected from all circuits I can get the DCOIL line (IC901-17) to
> activate when the "ON" button is pressed. If the DCOIL pin, which
> activates the degaussing coil relay, works shouldn't the POWER pin
> (IC901-18) work at the same time because whatever conditions were
> satisfied allowing DCOIL to activate because POWER (IC901-18) still
> doesn't come on. If I reconnect the SCL pin back to the circuit the
> DCOIL line doesn't work when the "ON" button is pressed. It's as if the
> micro is waiting for feedback from another circuit or a handshake from
> the EPROM before allowing the POWER pin to activate the SMPS, etc. It
> appears the micro is working but some condition is missing but what?
> This should have been a simple enough problem but has proven to be a
> learning experience. I did swap IC901 with a used one however it was
> never confirmed fully functional. Perhaps my problem is still with a
> defective micro? I can't source one; Samsung Canada no longer has this
> part in stock! This TV is only 6-7 years old. Even if a micro was
> available I'm reluctant to spend another $20-$40 not knowing for sure if
> the problem lies with the micro. Sorry for the long post, I wanted to be
> clear about the problem. If anyone has any other suggestions please
> advise, I haven't been able to get much help from Samsung on this
> problem.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of jonas miglinas
> Sent: Saturday, April 02, 2005 11:26 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - EPROM Question
>
> Hello David,
>
> Did the eeprom switch work? I just came across the same model as yours
> and
> was wondering if you gave up on it?
>
> Jonas Miglinas
> Miglinas TV
> Chicago
> ----- Original Message -----
> From: "Eric Manuel" <tvman@xxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, March 29, 2005 7:42 AM
> Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - EPROM Question
>
>
>
>>Hi David you can put in an Eeprom from a rca tv and it should work as
>>long as the micro is ok.All the samsung eeprom I
>>seen was blank as the settings are stored in the micro
>>
>>
>> Eric
>>E M Electronics
>>Deer Lake Nfld
>>Canada
>>tvman@xxxxxxxxxxxxxxx
>>
>>David wrote:
>>
>>>What are the symptoms of a defective EEPROM on this chassis? No
>
> startup?
>
>>>With the EPROM removed should I see mirco data activity?
>>>
>>>David Lessard
>>>Mr_fixit@xxxxxxxxxxxx
>>>Alexandria, Ontario, Canada
>>>
>>>
>>
>>
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