ASUS VW246H backlight cuts out in 1-2 seconds

[norcalx360repair]

Hi, someone brought me an ASUS 24 inch monitor(VW246H) and the backlight cuts out very quickly. Video is still ok confirmed with light. I googled this every which way and there isn't much info on this problem.

I opened it up and this one has PSU and inverters on one board. Board number is 4h.onc02.a01. All caps and everything else looks good on it but I know this doesn't mean they aren't bad.



I was hoping someone has seen this before. I don't work on monitors or tv's much at all and this is for a coworker so free type thing to try to help him out. Any help would be greatly appreciated.

I found similar PSU/Inverter boards on ebay for like $22 shipped but they aren't exact model.

Thanks!

[Hemingray]

I would check the caps. I have a 15" Hansol that did this exact same thing, and none of the caps were bloated, however I found a 470uF cap near the backlight inverter had failed (lost most all of it's capacitance). Replacing that brought it back.

[norcalx360repair]

Thanks for reply. Unfortunately, I don't have any way to even check capacitance now. I actually found the service manual for 26 inch version and I believe they use the same board. I'll check more and report back.

[Uranium-235]

for a monitor this big, and expensive, I would replace every single cap, including the small ones (starter caps)
edit: correction. I would try to replace every cap but the biggest one first (including the small caps). If that fails, replace the big one

[norcalx360repair]

I'll see if I have suitable replacements and report back. I have plenty of other boards I can check. THanks.

EDIT:No suitable replacements. I found that there is another compatible board part number. 5e-0nc02-001. Can't find it anywhere though.

[norcalx360repair]

When the backlight does come on for a quick couple seconds or so the screen is bright. I've been reading and some people say this can be due to a bad backlight tube but it will seem more dim than it should be. Since it is bright it doesn't sound like that is the issue, right?

I actually found a replacement power/inverter board but would suck if it ended up being the tube.

[rs2klee]

i kinda have the same problem is to why i joined the site, same monitor powers on then flash`s the screen then goes off, but the blue power light still stays on!