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Analogue systems
Echostar LT8700
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<blockquote data-quote="streetfarm" data-source="post: 643059" data-attributes="member: 333951"><p>Hi LLew, It's very kind of you to offer help in this way. I've spent the day trying to figure what's going on, and not got to the bottom of it. Connector J4 pin 16 from the main board to the display board carries the power up signal to microcontroller U25 (ST90R50C6-H) pin 71. I can see that rising from 0v to about 1V whilst the power button is pressed. J4 pins 2 to 9 seem to carry the data for the displays, as they trace from the Q outputs of the HC374 octal latch U28. J4 pin 1 has the clock for this latch. Pins 10 and 11 measure 5V. So is there something odd on pins 12 - 15? If you could check these for any change between the standby and ON states, that may provide a clue. I don't have a pinout for the microcontroller (searched the net for ages!). I would think there must be an output from it which triggers something into operation when it sees the button press.</p><p></p><p>Thanks for your encouragement!</p></blockquote><p></p>
[QUOTE="streetfarm, post: 643059, member: 333951"] Hi LLew, It's very kind of you to offer help in this way. I've spent the day trying to figure what's going on, and not got to the bottom of it. Connector J4 pin 16 from the main board to the display board carries the power up signal to microcontroller U25 (ST90R50C6-H) pin 71. I can see that rising from 0v to about 1V whilst the power button is pressed. J4 pins 2 to 9 seem to carry the data for the displays, as they trace from the Q outputs of the HC374 octal latch U28. J4 pin 1 has the clock for this latch. Pins 10 and 11 measure 5V. So is there something odd on pins 12 - 15? If you could check these for any change between the standby and ON states, that may provide a clue. I don't have a pinout for the microcontroller (searched the net for ages!). I would think there must be an output from it which triggers something into operation when it sees the button press. Thanks for your encouragement! [/QUOTE]
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Echostar LT8700
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