"Mark D. Zacharias" schreef in bericht
t...

"Gerhard" wrote in message
...
Hi,

I am trying to repair a Philips receiver 70FR260 or FA260. It had shorted
clamp diodes and open control transistor for the power relay. I replaced
them, but still the microcontroller does not wake up.
If I pull down the micro output, the power relay turns on the set. All
supply voltages are present but the display is dead. Also removing the
back up batteries for a while didn't help.
The micro controller oscillator is running, all of its signals seem to be
ok, including the key scanning pulses. So its program is probably
running.
I would appreciate suggestions to wake up this stubborn receiver!

Best regards,

Gerhard


What about the reset line to the micro?

Mark Z.


Mark,

Thanks for your response.
The /res line is high when the supply voltage is present and is pulled down
as the supply voltage drops. So I don't think the reset line is the cause.

Best regards,

Gerhard