Iiyama b2475hds died.

[khorne55]

Hey,

So for the past two weeks I have been experiencinig problems with my monitor as I had to take out the power cord, wait for a few minutes then plug it in to make the monitor work. But as of yesterday that does not work anymore.

I have opened the monitor up, and browsed a good few threads to familiarise myself with the issues other people had, of course most of the time the issue are capacitors. I am no expert but from what I see the capacitors seem just fine, I have tested multiple parts with a multimeter and most things seems just fine.

Thank you for all your help very much.

Kind Regards

[budm]

Re: Iiyama b2475hds died.

Any DC voltage readings on that white connector to goes to the logic/scaler board? There are two black rectangular shape fuses, one is for the main AC and one (close to the white connector) is for the logic board: are they OK?

[khorne55]

Re: Iiyama b2475hds died.

I havent checked the voltage at the connector, but there is continuity between live and neutral of the AC main, the two fuses are fine as well.

[budm]

Re: Iiyama b2475hds died.

Also check the DC Voltage right at the two legs of that big brown 450Vdc main filter cap, it should have about 330VDC.

[khorne55]

Re: Iiyama b2475hds died.

Hey, I have checked the capacitor and I got 320V dc.

[khorne55]

Re: Iiyama b2475hds died.

There is 5.17V going into the connector that goes to the logic board.

[lexwalker]

Re: Iiyama b2475hds died.

Hey,

So for the past two weeks I have been experiencinig problems with my monitor as I had to take out the power cord, wait for a few minutes then plug it in to make the monitor work. But as of yesterday that does not work anymore.

Please describe the symptoms when the monitor was not working, and/or started to malfunction. Does the power indicator LED still lights up? Does the monitor respond to any front panel control buttons?

I have opened the monitor up, and browsed a good few threads to familiarise myself with the issues other people had, of course most of the time the issue are capacitors. I am no expert but from what I see the capacitors seem just fine, I have tested multiple parts with a multimeter and most things seems just fine.

Thank you for all your help very much.

Kind Regards

There is 5.17V going into the connector that goes to the logic board.

Are those Lelon capacitors still there on the power supply board? And were they on the 5V rail? Also have you checked for any signs of dry/cold solder joints?

[khorne55]

Re: Iiyama b2475hds died.

The monitor is completely dead it does not do anything, there is no power supplied to the control panel I think as it doesnt work and the light does not light up at all, I was not able to turn off the monitor as it would turn itself back on at times but when the comuter was turned on again it would not respond to signals and I had to pull the power cord and wait for a while before I could plug it back in and power the monitor, the button would work then.

Edit: Yes the 2 blue caps are Lelon the rest are Rubycon

[lexwalker]

Re: Iiyama b2475hds died.

The monitor is completely dead it does not do anything, there is no power supplied to the control panel I think as it doesnt work and the light does not light up at all, I was not able to turn off the monitor as it would turn itself back on at times but when the comuter was turned on again it would not respond to signals and I had to pull the power cord and wait for a while before I could plug it back in and power the monitor, the button would work then.

I would suggest replacing those Lelon capacitors (which I predict could be on the +5V rail) first, and hopefully its not too late. Those symptoms sounds like bad power supply to the Dscaler board (where the MCU resides) and also possible beginnings of firmware corruption problems (which can be caused by bad power supply especially on that +5V rail)...

[khorne55]

Re: Iiyama b2475hds died.

All the capacitors on the logic board are Lelon too.

The big brown one is KXG and the other brown ones are KY.

[khorne55]

Re: Iiyama b2475hds died.

The Lelon capacitors are indeed on the 5v rail. Should I refer to the good caps thread in order to replace them ?

[selldoor]

Re: Iiyama b2475hds died.

Before you start ripping caps off can we look at one or two other things.
On the back of the power supply there are some "0" zero rated resistors
can you test those - meter on ohms should be the same as holding the probes
together.
While you are there I cant see that you tested the black box fuses - locate
where they are soldered on the bottom of the board and test those as well
but test them for a voltage at each side with respect to a ground screw

[khorne55]

Re: Iiyama b2475hds died.

The black fuses are fine, checked all of the resistors on the main board all of them seem fine.

[selldoor]

Re: Iiyama b2475hds died.

So what are the voltages on each side of the black box fuses?

[lexwalker]

Re: Iiyama b2475hds died.

The Lelon capacitors are indeed on the 5v rail. Should I refer to the good caps thread in order to replace them ?

Yes, replace them and cross your fingers that its not too late. As for replacements, check the original capacitor series for its specifications and look for capacitors that closest match to them. Sometimes capacitors can fail without showing any external signs. Usually for replacements we would recommend Panasonic FM, Panasonic FR, Rubycon ZLH, Nippon Chemicon KZE, Nichicon HD, Nichicon HE, etc...

[khorne55]

Re: Iiyama b2475hds died.

226 AC on the one beside mains 5v dc on the one beside connector

[khorne55]

Re: Iiyama b2475hds died.

@Lexwalker I will look and order those today, hopefully that will help the issue. Thanks for your input.

[selldoor]

Re: Iiyama b2475hds died.

If you have the correct voltages it is likely that whilst the caps are not great
they are working correctly. What are available in poland let us know what you are ordering before to order them.
I have seen an article on line whee they had similar problem and it was dvi
have you tried other inputs.

How old is the monitor - 3 year guarantee?


Also could be problem voltage regulator - tested?

[khorne55]

Re: Iiyama b2475hds died.

The monitor is 2.5 years old, 2 years guarantee, I wrote to iiyama despite that but they havent bothered to respond and I will let you know what I am ordering.

[lexwalker]

Re: Iiyama b2475hds died.

Also could be problem voltage regulator - tested?

I agree, could also be one the regulators on the Dscaler board...

The monitor is 2.5 years old, 2 years guarantee, I wrote to iiyama despite that but they havent bothered to respond and I will let you know what I am ordering.

Most monitor manufacturers don't bother once its past warranty.