Resetting an IC

[Stefano]

I am looking for a way (if there is any) to re-set an integrated
circuit. That pilots an LCD. The thing has 3 buttons, up, down and C. Up
and down set the price, C pressed for a couple of secs starts it.
It comes with a given credit, one you set the price per hour it draws
money from credit as time goes, until credit is over.

By opening it i see a +3V panasonic button battery, and on the small PCB
5 testpoints in a row (from now on ABCDE) another test point up right
(Z) and two test points up left (XY).
On the back of the PCB there are a few numbers that read:

94V0

89L06211

I short circuited some test points and I saw the LCD countin from 1 to 9
(every 7-seg read 1 or 9). Now it does the same thing as it lights up,
then as i press one of the 3 buttons it read 111 222 333 on the display.
Looks like I went into an LCD test mode or such...

If you have any advice on how (and if) can I reset it, or what you can
guess it's made of, that would be useful.

Thank you

S.

 

[Chaos Master]

This is Stefano for forever:

If you have any advice on how (and if) can I reset it, or what you can
guess it's made of, that would be useful.

Remove the battery and leave it off for a while?
--
Chaos MasterŽ, posting from Canoas, Brazil - 29.55° S / 51.11° W

"People told me I can't dress like a fairy.
I say, I'm in a rock band and I can do what the hell I want!"
-- Amy Lee

NOTE: messages are automatically sent after 00:00AM! I'm on dial-up!

 

[Stefano]

Un header molto originale introduce la risposta a "Watson A.Name - "Watt
Sun, the Dark Remover"":

I am looking for a way (if there is any) to re-set an integrated
circuit. That pilots an LCD. The thing has 3 buttons, up, down and C.
Up
and down set the price, C pressed for a couple of secs starts it.
It comes with a given credit, one you set the price per hour it draws
money from credit as time goes, until credit is over.

By opening it i see a +3V panasonic button battery, and on the small
PCB

Remove the button cell for a few hours or overnight, if you can. The
loss of backup power should cause it to initialize itelf.

Done. The behaviour is the same as described in the first post.
Maybe this is indeed the init mode, my question is if you can guess or
advice, given the few information i've provided, a way i cand try to re-
program itself with the initial amount of credit...

Thanks..

Stefano

 

[Watson A.Name - \"Watt Su]

"Stefano" <oppenheimer@bomb.ne> wrote in message
news:NQixd.311232$b5.15118707@news3.tin.it...

I am looking for a way (if there is any) to re-set an integrated
circuit. That pilots an LCD. The thing has 3 buttons, up, down and C.
Up
and down set the price, C pressed for a couple of secs starts it.
It comes with a given credit, one you set the price per hour it draws
money from credit as time goes, until credit is over.

By opening it i see a +3V panasonic button battery, and on the small
PCB

Remove the button cell for a few hours or overnight, if you can. The
loss of backup power should cause it to initialize itelf.

5 testpoints in a row (from now on ABCDE) another test point up right
(Z) and two test points up left (XY).
On the back of the PCB there are a few numbers that read:

94V0

89L06211

I short circuited some test points and I saw the LCD countin from 1 to
9
(every 7-seg read 1 or 9). Now it does the same thing as it lights up,
then as i press one of the 3 buttons it read 111 222 333 on the
display.
Looks like I went into an LCD test mode or such...

If you have any advice on how (and if) can I reset it, or what you can
guess it's made of, that would be useful.

Thank you

S.