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Monitor - No image

L

lion_sta

Junior Member
Hello everyone,

I've created an account here since I found some pretty helpful threads on repairing monitors.

I have an Asus v238h and a couple of months after the warranty period it broke. At first it would have image for a couple of hours and then off, then for less and less and now not at all.

So one option it would be to take it to a service and pay like 30$ to get it fixed - no fun, or fix it myself.

I have opened it hoping to find a broken capacitor or something but the power board is clean, and everything looks fine.

That led me to believe that it's an issue with the back light.

What do you think, am I correct?
 
lion_sta said:
Hello everyone,

I've created an account here since I found some pretty helpful threads on repairing monitors.

I have an Asus v238h and a couple of months after the warranty period it broke. At first it would have image for a couple of hours and then off, then for less and less and now not at all.

So one option it would be to take it to a service and pay like 30$ to get it fixed - no fun, or fix it myself.

I have opened it hoping to find a broken capacitor or something but the power board is clean, and everything looks fine.

That led me to believe that it's an issue with the back light.

What do you think, am I correct?
Click to expand...

If you're not an experienced tech with the ability to read schematics and probe and measure voltages, resistance, etc. and unsolder and replace parts without damaging anything else, you risk doing futher damage to your monitor.

A professional tech may charge you $30 just to evaluate the problem and more to repair it if it requires replacing or repairing anything, but it may be your best choice. At least you'll know what the problem is. Then, the question is whether the cost of repairing the monitor is greater than the cost of replacing it.

Also, if the tech's cost estimate is more than it' s worth, you can go ahead and experiment to see if you can fix it because you're already trying to ressurect a known dead piece of hardware.

If all fails, recycle responsibly. Best Buy and some other stores offer free drop off for recycling dead electronic hardware. 😎
 
Don't agree with you there, best repair if you can.

But you were right, managed to short the hell out of the power board. Missed a foil that was there and there is that.

Not able to do all that but still will try and do that. First I will try and find what have I shorted, something that I don't know yet how to do. Then, if nothing works, will buy from China the power board that costs like 17$.
 
If it's just the backlight then when the screen shuts off you should be able to shine a flashlight at it at an angle, and see the image on the screen.

How do you short out a power board? It seems like you aren't following safe practices with something running off mains power which can be dangerous.

Anyway, since it begins to work again, or at least did previously, after it went off, you most likely have a bad solder joint that breaks whichever circuit once it heats up, but that progressively got worse and worse from increased resistance/heat.

It's probably on the power board so you'd trace backwards from the wiring going to the LED backlighting, looking at the solder joints. It's probably on a switching transistor or the transformer and you'd just need to reflow the solder, maybe add a little, or maybe it delaminated a trace off the PCB and you need to glue it down and cover over it with epoxy to help keep it in place, or substitute a jumper wire for a bad trace.

As for the new damage to the power board, see if there's a fuse that's blown. If not then probably the switching transistor, or diode(s) but frankly I'm leaning towards it being a better/safe value to you to pay the $30 if you can really get it fixed that cheap. I'd sooner suggest giving up on it if it had fluorescent backlighting because the tubes would likely be about worn out by now, but being LED there are fair odds that it has a few years left in it if shorting out the power board didn't do damage to the panel at the same time.

It never hurts (well only a little) to take good high-res top down and bottom up pictures of a circuit board, oriented the same way so people can see how things are placed with the pics side by side, put them on imgur.com or similar image sharing site and link to them in a post. Not only will it give others a chance to look for a fault but also give a better idea of the design and what is likely to have broken or what to measure where.

Now for the irony... this topic just reminded me that I bought a VH238AH around the end of 2011 and used it for about a day setting up & testing a system then put it in a corner behind some stuff and forgot I had it. Now I have to buy another monitor stand so I can rotate it 90', assuming it has VESA mounts... yeah there's 4 little rubber plugs on a picture of the back that are probably hiding them.
 
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lion_sta said:
Hello everyone,

I've created an account here since I found some pretty helpful threads on repairing monitors.

I have an Asus v238h and a couple of months after the warranty period it broke. At first it would have image for a couple of hours and then off, then for less and less and now not at all.

So one option it would be to take it to a service and pay like 30$ to get it fixed - no fun, or fix it myself.

I have opened it hoping to find a broken capacitor or something but the power board is clean, and everything looks fine.

That led me to believe that it's an issue with the back light.

What do you think, am I correct?
Click to expand...

I also am having this problem 🙁
 
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