[TechAssist] Re: Emerson TC1972 dead

Adam, also see if you have & check R802 (1ohm 1 watt),
D504, R502 (3.9 ohm 5w), R507, IC101 (TMP47C434N3437),
IC104 (78I05, 5v may be low on it).

You can also try and temporarily ground pin 33 of IC101
(while plugged in) to reset the micro.  (BTW, I happen to
show 1/2 w for D124).
-Clint

http://computerhardware-consumerelectronics.com
http://orpheuscomputing.com/domain-names.html
http://orpheuscomputing.com
Clint Hamilton, Owner
Orpheus Audio/Video & Computing
Tech-Assist Administration
http://tech-assist.org

----- Original Message -----
From: "Charles Belich" <seashell@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, July 29, 2001 12:33
Subject: [TechAssist] Re: Emerson TC1972 dead



Adam D124 is a 12v , 5w zener it has caused this problem
before.............Charlie

Charles Belich
Slidewire Electronics
MN seashell@xxxxxxxxxx

----- Original Message -----
From: "TechAssist Admin." <techassist@xxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, July 29, 2001 4:30 AM
Subject: [TechAssist] Emerson TC1972 dead


>
>
> i have an emerson tc1972 dead set, no relay click. checked
> standby voltage, looks ok, if i short relay transistor high
> voltage comes
> up normally, but processor ic doesnt start do anything, the
> 'on' pulse from
> ic101 never changes states to q104 to turn the thbing on,
> power button
> changes when pressed, is ic101 bad? i have no documentation
> for this tv, or
> the chip.
>
> also, i am interested to share schematics, where do you
guys
> keep them, are
> they downloadable, pdf type? my experience lies in
industrial
> electronics
> as well as consumer, i spent 5 years repairing pc cards,
> drivers, and plcs,
> all with no schematics, except what we created using orcad
> and data sheets.
> most of my consumer experience is in audio and vcrs, i
> recently opend a
> shop in my hometown where there is no repair place for
40-50
> miles around.
> so i am trying to help my community i suppose, so i am
pretty
> well working
> on most anything that has a wire attached to it these days.
> if you guys can help me, many thanks! and if i can help i
> will try as well.
> adamt123@xxxxxxxxxxx
> adam
>
>
>
> // eompost 3B630458:3A1B.1:grpunffvfg
>
>
>
>
>
> Help make your TechAssist online repair tips
> database better!  Submit your fixes here:
> http://geocities.com/circuit_work/tip/#tips
> To unsubscribe write to:
> techassist-request@xxxxxxxxxxxxx
> with  unsubscribe  in the subject line.
>
>

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