On Thu, 14 Feb 2013 20:26:31 +0100, jana1972@centrum.cz wrote:
:: How( what pins )  to measure to know it is No.1 or No. 2. or No. 3?
:: Any suggestion?

Check power supply capacitors, including the ones near any SM chip that=20
might be on the board, for bulging and if possible check their ESR. Your=20
meter might read correct voltages +/-, but the circuit might not be getting=
=20
enough current to actually do anything.

Next check the CPU HALT pin, see if it is asserted, check any other IC's=20
for the state of their reset pins.

If there is any external device attached, try disconnecting it and see if=20
there is any flicker of life.

Colin
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cdb, colin@btech-online.co.uk on 15/02/2013
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