Hanns_G HG281D with flashing/blinking screen problems

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

Leave the plastic on for now. Are those caps rated at 85C or 105C? I can't quite make it out.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

ok heres the inverter irt as a plastic cover on it, ihave to remove the whole thing to get it off, I will if necessary, i hope this will suffice but say the word and Ill remove it. Im gonna check those other voltages now
Retiredcaps.

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

ok heres the volatages

Those voltages look good. One of the 5.1V is probably your standby power (the other 5.1V probably goes to the logic board). The 12V and 24V DC indicate the SMPS is working (otherwise you would not have secondary voltages).

Now let's measure the voltage regulators on the logic board. I circled one in red and one in yellow.

1) What are the part numbers?
2) What is the DC voltage of each pin?

Depending on what you find, this may lead to some recommendation as per my post #14.

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

you want a pic of that too?

Yes, because the inverter board has caps on it and we want to see the condition of the board. Often browning indicates something is running hot or potentially not right.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

Yes.

you want a pic of that too? oh duh I see you already said too ok in few ill get it up.

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

Im not sure there is a long board that goes down the side of the screen could that be it?

Yes.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

Dose this monitor have an inverter that's separate from the P/S?
If so could you post a picture of the inverter?

Im not sure there is a long board that goes down the side of the screen could that be it?

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

ok heres the volatages

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

The way I work is I usually like to have "probable cause" in order to recommend some action. While replacing the caps might fix your lcd, without any hard data, it is a "blind" decision.

And no I'm not a law enforcement person, but I do watch a lot of Law and Order. :-)

PS. There are 7 other threads regarding this same lcd and new caps have solved most of the issues.

[alexanna]

Re: Hanns_G HG281D with flashing/blinking screen problems

Dose this monitor have an inverter that's separate from the P/S?
If so could you post a picture of the inverter?

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

Okay, hookup a computer then and re-measure the voltages.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

heres the thing, It has a cns1 a cns2 and a cns3 jumper. There is nothing connected to cns3 and when I turn it on it has voltage for a second then it drops out as it sees theres no input and the indicator light turns yellow the only pin that has constant voltage is the #5 pin on cns2 it wavers between 5.1 and 5.2 so its hard to read the others

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

does it have to have be connected to computer hdmi to test or just turning it on will work?

It doesn't need to be connected to a computer. Just turn it on.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

ok a quick question, does it have to have be connected to computer hdmi to test or just turning it on will work?

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

Your photos of the front are a bit out of focus and not at the correct angle, but most of the connectors (top left in your picture) have a legend.

You want to measure the DC voltage of all those pins on all connectors and list them here. For example,

CN01

pin# - legend - actual measurement
pin 1 - 5V SB - 4.95V
pin 2 - GND - 0V
pin 12 - 12V - 12.05V

Use a ground screw for your black probe.

If there is no legend, post a clear focused pic of the connectors and mark up the pic with your own numbering scheme and voltage measurement.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

This is what the back looks like not sure which to test.

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

I guess I should start with caps and then see how it works? and go from there?

Start with the voltage measurements.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

oops didnt see the other post above, ill see about the voltages being listed. -- NO VOLTAGES LISTED, Also I note it is a Revision 1 I will have to put it back together and test.

[Barq]

Re: Hanns_G HG281D with flashing/blinking screen problems

No. Most sellers on ebay either sell crap or fake caps. Stick with digikey, mouser, or if possible badcaps.net store. These 3 sell quality low ESR caps which are required in a SMPS application.

Thank you for your response it is appeciated. So, does what I have going on sound like caps? I guess I should start with caps and then see how it works? and go from there? The sparkly pixeled screen had me thinking it could be something else as well. Also this started after having a power outage and I ran the comp off of a modified power inverter from battery backup system. Could this have caused the problem?

[retiredcaps]

Re: Hanns_G HG281D with flashing/blinking screen problems

If it does sound like caps should a person go use the kits on EBAY?

No. Most sellers on ebay either sell crap or fake caps. Stick with digikey, mouser, or if possible badcaps.net store. These 3 sell quality low ESR caps which are required in a SMPS application.