Dynex DX-32L150A11 Standby Blink

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

What resistance, board powered down & unplugged from power board, do you get across 5V now?

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

Removed that regulator and now I have steady 5.20v at that rail and steady standby light. Power button doesn't do anything.

Anyway to test the regulator with ohmmeter? I have a bad feeling there's a short at its output somewhere and regulator is good.

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

In a way but not really, also it would need to be in series with one of the power outputs to do such a job. (A computer fan has transistors in it to switch various motor windings, it switches rapidly between near zero and near infinite resistance.)

Wouldn't wired in series drop the voltage at the output?

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

In a way but not really, also it would need to be in series with one of the power outputs to do such a job. (A computer fan has transistors in it to switch various motor windings, it switches rapidly between near zero and near infinite resistance.)

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

Doesn't work without resistors to divide current between equal or dissimilar voltage sources.

Isn't a fan a type of resistor (load)? Just trying to learn as a go. Thanks for helping along with this. Been helpful

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

Doesn't work without resistors to divide current between equal or dissimilar voltage sources.

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

I don't know what you mean by doing that... You'll probably find one power supply or another will take the whole load so it should be the same as with PSU? A 1.8V regulator could be the cause, you can remove it for a test (the set will not work right but it should have 5V steady.)

Doesn't current divide in a parallel circuit? That's why I connected the fan in to cut amps going to the main board. I could be wrong but it was quick thinking to limit current since I don't have proper resistor. Will remove regulator and see what happens.

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

I don't know what you mean by doing that... You'll probably find one power supply or another will take the whole load so it should be the same as with PSU? A 1.8V regulator could be the cause, you can remove it for a test (the set will not work right but it should have 5V steady.)

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

Well before seeing your reply I went ahead and connected the fan I used to load the psu for testing (12v .22A) in parallel with iPhone charger to supply the main board. Figured in parallel it'll cut down the current going to the board.

Used some freeze spray and instantly noticed the 1.8 regulator warm up. Now my question is, could that be the fault or whatever it's powering? I'd imagine it'd be connected to the processor with a voltage that low at its output.

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

Yes, it does. The resistor is in series at all times.

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

Does the resistor's wattage still have to be high with a power supply only rated at 1A?

Also, do I connect the resistor in parallel or series?

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

The same for any charger >=1A. Approx 5.1 ohms.

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

You need a resistor and a power supply capable of supplying at least 1 amp.

What value resistor if I use the iphone charger thats rated at 5v 1amp out?

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

You need a resistor and a power supply capable of supplying at least 1 amp.

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

oh ok, would I still need the same type of resistor mentioned before or?

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

Yes, you do still need one. Such a charger is capable of well in excess of its rated output when driving a short circuit.

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

I assume you are thinking about directly connecting omitting the resistor? That is what I am saying is bad, on its own a power supply with the resistor should be OK.

The resistor was for using a cpu psu but now I'm talking about a small phone charger that outputs 5v 0.7a, I'd still need a resistor for that?

[tom66]

Re: Dynex DX-32L150A11 Standby Blink

I assume you are thinking about directly connecting omitting the resistor? That is what I am saying is bad, on its own a power supply with the resistor should be OK.

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

I have another charger with output of 5v 0.7a. Would that be safer?

[ohmmy]

Re: Dynex DX-32L150A11 Standby Blink

And many more amps short circuit. Not unless you want to incinerate what is causing the short.

Thought you said to use minimum 1amp supply? I have some other phone chargers rated at 5v out with lower amps ratings than the iPhone one. What's ideal amps output to use?