Unit is completely disassembled/was told it was either the backlights;or the inverter board.Makes more sense,that it's trhe inverter bd. -then both lights expiring at same time. Where can I find Liquidvideo parts/or damaged monitors for parts?
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Re: black screen on L17lcd2
If you even manage to find some, I am almost completely sure it would be better to buy a new one when it comes to finances. Putting these parts together is a skilled technique. Also, if you have a guarantee with that monitor, why not return it.
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It sounds like a backlight or inverter problem. You can verify this by using a bright light to shine on the screen surface. If you can see the picture (but it will be very dark) that means that the backlight which illuminates the screen from behind. You would have to replace the inverter to test it, but there is good news: These are pretty difficult to find parts for, and not an easy repair for an amateur; acer products usually have a 3 year warranty on the backlight/inverter system, so I would start there.
If your monitor is going black every minute... It is most likely a problem with the backlight lamp or the inverter board that drives the lamp. Fixing this issue would require disassembly of the monitor and testing the lamp and the inverter board. Most commonly it is the lamp that burns out. The cost of repairing this issue with parts and labor is typically more expensive than replacing the unit.
Go check the backlight inverter lamp, replace if busted. This can be found when you open the back of your lcd and manage to get access to it. The backlight inverter lamp is located at the upper and lower part of the screen. Go check also the inverter board, the one that suppply high voltage to inverter lamp, see if this ballast transformer are not burnt out. The
input voltage of the inverter board is 24vdc the output is 250v ac..The
voltage input terminal of the inverter board usually creates a loose
solder. Use a soldering iron to resolder them....
This lamps are
available online to order at shoppejimmy.com
ruth_coleman, Only a guess but I would say that the "switch-mode-power-supply" or "backlight inverter power supply" has a problem. Is screen always BLACK? how old is unit? How many "ON" hours on this unit? Is unit new? Out of warranty? Did it ever display a PERFECT IMAGE on it? When? Did it always HUMM?? FYI check out VIDEO clips of LCD monitor disassembly and repair on YOUTUBE to find out what is inside a typical LCD display. You will have a better handle on what to do about getting it repaired or to trade in for new. Yes, monitors can be REFURBISHED with new SMPS/Inverter boards for $50-$100. Check out some ADs here on fixya. I'm louie12fix on fixya or email@example.com please rate this response and get back to me if you need further assistance. Bye for now.
It sounds like a backlight problem. It could be a problem with the inverter board or backlight itself. When the display "blanks out," can you still see a faint image on the screen -- especially if you look at an angle with some light shining on the screen? It is usually easiest to see changes on the screen - so after Windows boots, press the windows key on the keyboard repeatedly and look at the part of the screen where the start menu would appear. If you can see anyting, then it is definitely a backlight problem.
If it is a backlight problem, you'll need to disassemble the LCD panel to correct it. Correcting it might be as simple as re-seating or re-routing a loose or pinched backlight cable to as complex as replacing the LCD panel and inverter board. There is really no way to tell over the Internet. You'll probably void any applicable warranty by disassembling the panel.
By the way -- watch out, the inverter board can generate lots of voltage and reasonible amounts of current. I've never been shocked by one, but I've been careful.
firstly stop turning it off and on because you will blow something else like a power board then it will be a big paper weight. next get a torch and when it is powered on and supposed to be showing images, shine the torch at the screen. if you can see everything then you have a broken backlight or problem with your backlight and connections. they cost approx £15 and a little labour, its not a big job. you may be able to do it yourself if you can get hold of a service manual.
No it is not a backlight it is the inverter board which sends power to the backlight most likely cause is bad capacitors on the inverter board. this wil require soldering to repair backlight is even worse it requires you to disassemble the lcd unit. if you are gong to ope up the lcd monitor look on all pcb boards for deformed (blown) capacitors replace those with identical ones from yur electronics shop9they must be exactly the same mfd (Microfaradays) and Voltages
Here is a pic of the fuses on the inverter board for a Viewsonic vx900, you can visually inspect them as well if you do not have a volt meter. While visual inspection is not 100% reliable, usually when these are popped you will see the red line across them is black or broken.
HI. I had the same problem with mine. It would flash the screen on for a split second and then turn black, the whole time the power light remained green. Upon opening up the case, I pulled the combo power supply board/inverter board out for inspection. I noticed one of the capacitors had a bulge on top indicating it was bad. It was the the 680uf 25v capacitor. I desoldered it, and soldered in the new one. After hooking everything back up, bingo!! Monitor now works perfectly. I couldn't find an exact match to the capacitance locally, but I had a 1000uf 35v cap in my utility box. It worked fine as a replacement. You can usually go within 30 percent of tolerance and be alright. Just don't go under on capacitance or voltage. I hope this helps.