Re: Samsung 242MP 5v standby but not turning on

You are correct, there is an incredibly small voltage of 0.02 or so on ps_on

I read some of the information about the larger chips in the service manual. And found the connection from the function keys to the gm1601h-CF board. I found that if I probe that at the resistor listed for that circuit near the chip and press the power button I can see a drop from 3.3v to 2.5v.

This chip also has a connection to ps_on. If I probe that I get that same ~0.01v. However if I press the button I don't get a change. This...

Re: Samsung 242MP 5v standby but not turning on

Alright, I will keep in mind I shouldn't leave the main board connected when testing the power on pin. And that I should use a resistor.

To answer your question no I do not get any voltage spikes on the power on pin when pressing the power button.

I figured that the power supply wasn't being activated after I checked that it could give the required voltages. I am having trouble tracing what components I need to test to see what would be preventing the on signal. I've tested the few components that show...

Re: Samsung 242MP 5v standby but not turning on

From reading the user manual, it doesn't appear that the power light should be on during standby.

I have 5v at the main board, but the monitor won't turn on. This is with only the main board and supply connected.

I tried connecting the power_on pin to 3.3v, which I can then test the other pins coming from the power supply, and they all read within a volt of expected.

From reading the service manual, I have tested for voltage at C614, FT670 and FT671.

If I test without the connection to power_on, I only get voltage at FT670 and FT671, which are both 5V.

If I test with the connection to power_on I get a reading of 12V at C614.
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Re: New Members - please post your introductions here

Hello there, I have been perusing this website to try to figure out how to fix an old monitor (to educate myself in how circuits work and also to fix the tv! ).