开云体育

I have not read all the other responses so apologies if this is a repeat.
I owned a 744 once with the same hiccup behavior. The CRT driver circuit was bad. You report that you have (had) good VGA from the back panel, and that's what I had.
I was able to temporarily remove the connector to the CRT circuit (I believe it was a small four-pin connector) and then the scope powered up and I was able to use it with the VGA output.
After that I was able, some how, to troubleshoot and repair the CRT board, but I see someone has offered to help with replacement boards so that would be the way to go.
Good luck and of course keep us posted.
dan

Hi, Thank you for your message and suggestions. As I mentioned, the acquisition board is shorted, and I have isolated the op-amps and, if I am not mistaken, some CMOS components connected to the +5V and +15V lines, along with some resistors and capacitors that are causing the short.
I just need to locate the input pins for these voltages to apply a small, limited voltage and see which of them generates heat. I know I can apply the voltage to a capacitor, but I’m not sure if it would be the same.
Do you have any suggestions? Thanks in advance.
P.S.: The CRT board is disconnected.

Hello, The truth is that I took a while to post because I didn’t have the money to buy the spare parts. I had to work extra hours for two months to afford them. I'm sorry.

These schematics are for the TDS540, but the power pins will be the same:





Jared

Thank you, Jared, for the gesture. I really appreciate it. 73!