Question about Sharp LC 20VM2 20 in. Flat Panel LCD Monitor
I have two Sharp LC 20VM2 monitors which when powered up, power LED turns green, then shifts to red, diplay is blank with no backlight. PSU is giving out the correct voltage, all fuses are okay and when inverter board enable is grounded the backlight fires up no problem, no image at all though. I have 2 of these monitors with this identical fault which makes me suspect it is a common fault on these units - anybody have this problem and know which IC to change or where to look ? Thanks in advance/.
kilo2_tango2, You walked into this one!!! Let's cheer everybody up with a few laughs first. "where do I start looking??? Maybe in your pocket for lots of 10s & 20s. You will need them to do a swapout for a refurbished unit from SHARP, IF???? they even have a swapout program. "so psu probably ok" Well, maybe yes, maybe no. Is this psu a little black box that lays on floor, or are you refering to a internal to the monitor "switch-mode-power-supply" unit? By the way, you didn't even calculate for us the approximate number of "on" hours this unit has!! Ahh...Yes! You did type "display blank"!! I will assume that it is or was connected to a PC capable of displaying the WIN-desktop screen?? If such was the case, did you even do the "flashlight" test to see if the data made it to the screen? even if the CCFT's aren't lit up BRIGHT-WHITE on rear of LCD panel? Due to a INVERTER BOARD failure to supply 800-1200 v ac to light up the CCFT's. Well, k2t2 I hope some of this was helpful. Got to run now! I'm louie12fix on fixya or [email protected] get back to me if any of this made sense..
Posted on Sep 27, 2009
SOURCE: I have Sharp Aquos LC-65D64U
It sounds like a backlight inverter to me. I am 99% sure. The buzzing noise you mentioned kind of confirms that, so does the backlight turning off. If you want to test them, then you are gonna need a multimeter. I will see if I can find a schematic in my collection, but be aware that this is a highvoltage device we are dealing with. May not be a good idea to test it yourself if you have never worked on electronics before. The sets hold nasty voltages for several days after its turned off and unplugged, and can injure you if you are not careful. I don't mean to scare you but its my job to tell you. If you want to proceed then I'm game.
Posted on Nov 01, 2010
check if their is a signal on voltages around 3.3v at the inverter board if none their is a problem in the board which is in the processor.
Posted on Aug 31, 2012
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