Re: Sharp LC-50LB261U - has audio, no picture
Does anyone know what LED's they are individually to replace? 3528's? I have 4 of them out that I tested with the SID LED and backlight tester. Hoping to be able to simply replace those to get it working again.
nv13
Member
Last Activity: 07-09-2018, 12:58 PM
Joined: 07-29-2013
Location: Illinois
-
Re: Asus VE278Q BackLight
selldoor,
Sorry, I have no further progress at this point. I still need to locate a fuse for this board before I can move on. Was going to try a local Radio Shack store Monday to see if they had anything in stock before I go online, prices didn't appear that great upon initial search. I will keep you posted as I move along.
Thanks for checking in!Leave a comment:
-
Re: Asus VE278Q BackLight
Quick update...
I tested the F901 and it reads nothing where the other two fuses register a reading so I assume that those are good. I will need to replace only the one at this point.
As for the LED strips there are four that come off the power supply/inverter board. They identified as KOTL E220709 AWM 20798 80C 60V VW-1 Similar to this [url]http://www.ebay.com/itm/KOTL-E220709-AWM-20798-POWER-BUTTON-SWITCH-FLEX-RIBBON-CABLE-12-PIN-150MM-6-INCH-/271636567474?pt=LH_DefaultDomain_0&hash=item3f3ecd15b2[/url]
Upon initial...Leave a comment:
-
Re: Asus VE278Q BackLight
Yea I was eyeballin that first one Lumberjack777.
I think the second one is different though... unless that green board can be swapped out as I have four LED input connections instead of one. I bet it would still work but would hate to chance it.
I am not in a hurry with this unit...it is more of a project than anything else.
The fuse might be the F901 T4V 250V. There happens to be three which I will probably just replace all of them. I may try to find non working monitors and see if I can use caps and fuses for parts as ne...Leave a comment:
-
Re: Asus VE278Q BackLight
Hey thanks for your input selldoor! I appreciate your time.
I am afraid in my haste that I have shorted out an item "C904" in Pic 1 as shown in "New Image 1" upload. I tried testing voltage without power and received no readings. Powered up and things came to an end fairly quick.
It no longer powers up however and I do not see any visual scorching or any other abnormalities from to this event.
I assume this whole power supply/inverter board is beyond saving. I have no idea anymore.
...Leave a comment:
-
Re: Asus VE278Q BackLight
So I should hook everything back together and test voltages. Is this with or without power?
Thanks for pointing out the fuses.
The LED "ribbons" connect on "Pic 1" that small green board that is attached to the tan board. Or Pic number 3. Which is a closer image of the board. At the top of it there are 4 ribbon "flip" connectors. Like the type you might see on a laptop keyboard.
I will check voltages without power at this point. Unless otherwise noted to do so with power (plugged in).Leave a comment:
-
Re: Asus VE278Q BackLight
These are the caps that I have on the power supply/inverter board (this is the tan colored board correct?), assuming it is at fault here. I was unable to test voltages, not entirely sure what I should be done to do so. I do have a multi-meter to test with. I have read that Caps need to be removed to test out of circuit unless using an ESR meter which I do not have. I have read the guides posted here about testing components. Not sure my multi-meter is reading correctly, more likely I am not doing it correctly.
(2) 1000uF 25v
(2) 470uF...Last edited by nv13; 06-20-2015, 11:04 AM.Leave a comment:
-
Re: Asus VE278Q BackLight
If anyone knows what or where I can begin testing the voltage on which boards that may steer me in the right direction. Is there a section of (R)esistors or (C)apacitors and I should isolate and begin with?Leave a comment:
-
Asus VE278Q BackLight
Hello all!,
This monitor was given to me in a state that the LCD image is functional however the backlight was dim and flickering. I tried turning up the brightness on the monitor OSD and the monitor backlight ceased to flicker or function from that point forward. Upon the restarting and subsequent restarts of the monitor it initially flashes quickly and goes out after a split second. It is not the 2 seconds to black as is popular with other monitors. That is not to say the end solution isn’t though. The power button stays blue and the image is still visible albeit with a flash light....Last edited by nv13; 06-18-2015, 09:00 AM. -
Re: New Members - please post your introductions here
Hello from Illinois (USA).
I currently work for a tech company. I primarily work on PC's and Mac's as well as networking and pertinent software and whatnot. I have repaired a couple of older LCD monitors in the past with advice from the many people at this site. I hope I can contribute in the future with others as needed and as able.Leave a comment:
No activity results to display
Leave a comment: