Monitor flickered, and now won’t turn on

Question

ASUS VN289Q LCD Monitor

Released on February 24th, 2014, the Asus VN289Q is a 28-inch monitor with a resolution of 1920x1080 pixels.

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David @david31196

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crwdns2931729:0crwdne2931729:0: Maw 14, 2023

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Monitor flickered, and now won’t turn on

I built a new frame for an ASUS Monitor 27”, removed the backlight in order to use the screen transparent with natural light, as done on this video https://youtu.be/Shp5JhOqdKI https://youtu.be/Shp5JhOqdKI I was extremely careful with the electronic components but the screen soon started to flicker and bands went horizontally, it came back and worked for a while but now won’t even power up. Can someone please help me to know how to go about this without damaging the device? Thank you very much, Nick

I covered the top of the electronics with steel sheeting instead of the usual aluminum and tested the monitor with shining a power bank with a flashlight built in it and don’t know if this would have or something else interferes with the electronic components.

Here are both sides of the two circuit boards aside from the LCD and both sides of the LCD circuit board.

In case interference is the problem, I opened a different LCD display and all of the circuit boards including to the circuit board attached to the LCD glass were on both sides shielded by aluminum sheet and foil tape.

Here are the images of they upload of a different monitor Asus VZ27E; it was a lot easier to reframe without a backlight.

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In case the photos didn’t upload, here they are.

crwdns2934271:0Maw 15, 2023crwdnd2934271:0 David crwdne2934271:0

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oldturkey03 @oldturkey03

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crwdns2931729:0crwdne2931729:0: Maw 14, 2023

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@david31196 we really have to see what you built there. It does sound interesting. Now, here is the bad part. "but the screen soon started to flicker and bands went horizontally" is usually related to the LCD driver boards. Not turning on, is a power board issue. Again, we need to see all of it so we can try and see if we can help you further.

Adding images to an existing question

The issues that you are having originates on the LCD driver board. There are Source drivers and Gate drivers. Source drivers are responsible for the vertical part and Gare drivers for the horizontal part. You will need to very carefully check the small ribbon cables that connect the Driver board to the LCD panel, for any small tears, loose connection to the panel etc. These ribbon cables are attached via a special process and are not replaceable. You really need to be gentle with those since they love to break and break the connection.

It's not a matter of any shielding etc. It's a matter of not making connection or having a bad component.

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I don’t know if you will be notified by how I entered my comment; I couldn’t find out how to comment to your answer with photos. Thank you for helping.

crwdns2934271:0Maw 15, 2023crwdnd2934271:0 David crwdne2934271:0

@david31196 if you use the @username then we get notified :-) Yes, pictures can only be added to Questions and Answers, but not comments. you did the right thing

crwdns2934271:0Maw 15, 2023crwdnd2934271:0 oldturkey03 crwdne2934271:0

Could an issue with the LCD driver board cause the unit not to power up; the power light doesn’t even turn on when I press the power button?

When I could get it to work It started to flicker after I put a steel sheet over the interior electronics’ components box. Could steel be a problematic material or is steel sheeting safe to use?

Is it inconsequential for me to put a piece of aluminum over the LCD driver board and the LCD cable when I get one to work correctly?

crwdns2934271:0Maw 15, 2023crwdnd2934271:0 David crwdne2934271:0

I meant also to say that I have a 2006 Sony 40s4100 Bravia I just took the back off and a circuit board is enclosed in a metal box that the LCD panel driver board two ribbons connect to and a piece of metal foil is taped over the top of the metal box where the LCD driver board ribbons underneath the tape into the metal box pass into. Could something else need shielding?

crwdns2934271:0Maw 15, 2023crwdnd2934271:0 David crwdne2934271:0

@david31196 correct. you do not need to shield the LCD board or the cable. You also do not need the shield over the power supply etc. I like to keep things open and air circulating. MAin issue is to ensure nobody sticks their finger on a hot power board. I've never had a TV/Monitor/Homebuilt device fail because of the lack of shielding.

A bad panel can prevent your device from coming on, it is possibly shortening it out. You would have to measure on the power board to see if you are getting power and where to you are getting power.

crwdns2934271:0Maw 15, 2023crwdnd2934271:0 oldturkey03 crwdne2934271:0

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[image|3022379]

[image|3022377]

[image|3022376]

[image|3022378]

In case the photos didn’t upload, here they are. — David
I don’t know if you will be notified by how I entered my comment; I couldn’t find out how to comment to your answer with photos. Thank you for helping. — David
@david31196 if you use the @username then we get notified :-) Yes, pictures can only be added to Questions and Answers, but not comments. you did the right thing — oldturkey03
Could an issue with the LCD driver board cause the unit not to power up; the power light doesn’t even turn on when I press the power button?

When I could get it to work It started to flicker after I put a steel sheet over the interior electronics’ components box. Could steel be a problematic material or is steel sheeting safe to use?

Is it inconsequential for me to put a piece of aluminum over the LCD driver board and the LCD cable when I get one to work correctly? — David
I meant also to say that I have a 2006 Sony 40s4100 Bravia I just took the back off and a circuit board is enclosed in a metal box that the LCD panel driver board two ribbons connect to and a piece of metal foil is taped over the top of the metal box where the LCD driver board ribbons underneath the tape into the metal box pass into. Could something else need shielding? — David
@david31196 correct. you do not need to shield the LCD board or the cable. You also do not need the shield over the power supply etc. I like to keep things open and air circulating. MAin issue is to ensure nobody sticks their finger on a hot power board. I've never had a TV/Monitor/Homebuilt device fail because of the lack of shielding.

A bad panel can prevent your device from coming on, it is possibly shortening it out. You would have to measure on the power board to see if you are getting power and where to you are getting power. — oldturkey03

ASUS VN289Q LCD Monitor

Monitor flickered, and now won’t turn on

Update (07/15/23)

Update (08/09/23)

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Update (07/15/23)

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