Question about Acer AL1916W 19" LCD Monitor

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I need lcd smps circuit dagram can i see that

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Here are the service manuals:
http://elektrotanya.com/?q=showresult&megnev=ACER&megnev2=AL1916W&kategoria=&kat2=schematics

If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Posted on Aug 30, 2010

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Posted on Jan 02, 2017

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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Circuit diagram .sansui sv2136


Circuit dagrams are in PDF, and cannot include by this window. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

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Hi,
You have to check the back light inverter of your lcd tv. In all lcd tvs there are back lights to illuminate the pixels. There are two types of back lighting in use . CCFL ( cold cathode fluorescent lamp) and LED (light emitting diode). In you your tv it will be CCFL. If it is CCFL then it need an inverter (voltage step up circuit) for getting its working voltages. Normally it will produce above 1000V in low current. In the inverter circuit there will be inverter transformers. If the winding of the transformer get shorted then the inverter will drain a high current from the power supply. If so then the current sensing circuit senses the same and it will shut down the power supply. That's why it do the cycle ON an OFF repeatedly.
Just check the inverter board. Normally there will be three circuit boards in LCD TV. Mother board, SMPS (switch mode power supply) and inverter board. In some tvs the SMPS and inverter bord will com-pained as one board. you have to check the inverter transformers. there will be 4 or 6 inverter transformers. if available replace the inverter board as a whole.
Also check the electrolytic capacitors in the power supply. if any of the capacitor seems like one that in the picture, then replace the same and then only go for the inverter board



ajin_g_8.jpg ok

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filmorepetty, The "switch-mode-power-supply" has gone into SHUTDOWN mode because it has detected a fault with itself or another circuit. Or it could have just blown a small fuse on the circuit board of the SMPS. Will the pilot lamp light-up? Did it have a clean, bright, crisp, image displayed on the lcd panel the day before? How old or how many total (approx) "ON" hours of use has it seen? Do you know that 98% of lcd monitors use "cold-cathode-fluorescent-lamps" and an accompanying "electronic ballast" circuit to generate the WHITE LIGHT needed for you to see the pretty colors on the LCD Panel?? Same basic lighting technology as the new screw-in socket curlie-Q CFL light bulbs! Only your monitor's lamps are thinner and straight and hung on the rear of the LCD panel. A failure of the ballast circuit could cause SMPS to shutdown. I suggest you visit some other websites for more info on what other owners are doing to try and repair BLACK SCREEN lcd monitor problems. The first place to go would be YOUTUBE and search and view the longer 6-12 minute video clips of "LCD monitor disassembly" and "LCD monitor repair" just FYI and to know what you are dealing with??? Your unit could also have FAILED electrolytic filter capacitors on the SMPS printed circuit board. I'm 12fixlouie Bye for now.

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dmcvey612, you may want to try: teliostech.com or lcdpart.com/products or lcdrepair.us and/or do search for INVERTER boards for lcd monitors. also search for "BAD CAPS IN LCD MONITORS.
I can't tell what board you have in your hand. Most lcd displays 95% have 2 poss 3 boards in them. If there are 2 then the SMPS board usually has the inverter circuit on it and is now called a combo. 3 boards just means that you have a Digital board (all monitors) and the inverter board is not on the main SMPS board. Hope this helps out some. BYE louie12fix on fixya or lmistyrel@ aol.com

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Confirm this is a monitor problem by connecting toanother working Pc.Also try starting in safe mode and see if you get stable image.If in safe mode you get image your image settings may need to be readjusted.
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