Question about LG Flatron L1710S 17" LCD Monitor

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Inverter problem , prefer to repair the board not buy new parts

Can yuo give repair information or testing of the inverter so i can repair it , as part are not easy to comby here in perth australia

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Repairing lcd inverter is like repairing a hv circuit used for strobe lights. try to check first all electrolytic capacitors, then loose board solder, also occularly check both ccfl bulbs for breakage and burnt marks.. best is if you can download schematic diagram for it so that you may check also all semiconductors on the board.

Posted on Jun 01, 2008

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4 Answers

On my Acer AL1916W monitor the screen comes on for a few seconds then goes off but the power light is still green.


Hi.

That is often an inverter failure. Try turning off the room light, and point a flashlight sticking to the dark screen. If you can see a very faint picture, then the inverter has failed.
Before replacing the inverter, the PSU must also be tested. If the PSU does not supply power to inverter, then the PSU and not the inverter is the part to be tested.

If the screen is not dark, but there is backlight and no picture, then the problem is not the inverter. In that case check the source and the connection cable. If the cable is OK, then it is usually the main controller board inside the monitor. Once again the part must be tested.

Regards.

Ginko.

Mar 10, 2011 | Acer AL1916W 19" LCD Monitor

1 Answer

3 year old LG model L196WTQ Flatron screen has gone blank (black)


It's probably a backlight or backlight inverter issue if the problem occurs on all sources and the onscreen menus. (The backlight itself usually fades or makes the on-screen image change to pink/red.) With a bad backlight, you'll usually see a very dim image if you look at the monitor from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing. For an out-of-warranty monitor, open up the back of the monitor and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.) The scorch mark and smoke may indicate a resistor or zener diode that had been used as a fuse and is now gone.

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the inverter board and power up the monitor. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the inverter is good, then it's probably backlights themselves (several in most monitors). These are sandwiched on the perimeter of the monitor (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your monitor size. Separate the panel from the bezel. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. See http://www.lcdparts.net/howto/default.aspx for more information but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx. Then push the new backlights into place, reconnect the wires and close up the sandwich of tape and other parts around the screen. Then replace it in the bezel.

With a good spare backlight, you can test an inverter for condition (plug together and turn on the monitor while the box is open). Similarly a good inverter can test the backlight.

I hope this helps.

Cindy Wells

Feb 22, 2011 | Computer Monitors

2 Answers

Bad inverter


Inverter Board? You can try shop that repair electrical things or the TV shop...

May 14, 2010 | KDS K-24mdwb LCD Monitor

1 Answer

Need a new MV-220 inverter board, but cant find it anywhere!


It may be worth a shot, but before you give it a go, I'd scrounge up any info you can on your florescent backlight (power rating, input frequency, ect.) Take it out carefully and see if it has any markings.
Then you can use a multimeter to test the output of the MV176.
If you end up ruining the light you have, you could always try and obtain the MV176's bulb and attempt to install it along with the inverter.

Mar 21, 2010 | MegaVision MV220 Monitor

2 Answers

Pl926wbi 19"proview monitor,screen goes black every 3 seconds,


Bad capacitors on the pcb boards internally unsoldering ad replacement is indicated.

Feb 17, 2009 | Proview PL926WBi 19" LCD Monitor

4 Answers

Sceptre LCD - no display


I have same problem... just went off warranty and they won't cover it.. they want $100 for repair plus $35 shipping plus I have to pay to ship it to them... For $179 I can buy a new 19" with 3 year warranty...I wouldn't buy another Sceptre at half the price

Jul 13, 2008 | Sceptre X9G Komodo IV 19" Flat Panel LCD...

2 Answers

Inverter board


just change the 4 bloated caps on the board (2)100mfd 16v and (2) 470mfd 16v

Mar 19, 2008 | AOC LM729 17" LCD Monitor

2 Answers

Can't find an inverter board for my X9G Komodo III


You can try http://providencedata.com/. They have a huge selection of inverter boards. If you are using the monitor and are confident in your souldering skills you can usually buy the capacitors for about 20-30 cents each... Bit of a risk if it goes and burns up on ya though ;)

Dec 10, 2007 | BenQ FP737S-D 17" LCD Monitor

2 Answers

Compaq FP 7317


I'm not sure about the inverter part of this but have you checked the menu options on the monitor itself to be sure the brightness and contrast haven't gotten messed up? Sometimes as a monitor gets older it requires more brightness to look the same.

Mar 28, 2007 | HP Compaq FP 7317 17" Flat Panel LCD...

2 Answers

Replacing Inverter Board


I did some poking around and only found a few places that sold inverter boards for this monitor. Ebay has one that sells for about $80: http://cgi.ebay.com/Backlight-Inverter-for-Gateway-FPD1930-LCD-Monitor_W0QQitemZ160070918225QQcategoryZ174QQrdZ1QQssPageNameZWINQ3aPOST0Q3aRECOQ3aBINQQcmdZViewItem I wasn't able to find any specific instructions posted, however, taking a typical LCD panel apart and replacing the board shouldn't be too difficult. The only hard part is not getting shocked, which is why this is not a job for the typical user. Anyway to disassemble the typical LCD you remove the pedestal from the back of the LCD then remove the screws around the back of the LCD, remove the back and look for the inverter board. Typically it is covered with a metal shield; again the hard part is knowing how to correctly handle the parts. Considering you can buy a new 17" LCD for $120 to $150 (and has a 1 year warranty) you might want to consider investing in a new monitor instead. If you have any other questions let us know, otherwise please don?t forget to rate this posting.

Feb 03, 2007 | Gateway FPD1760 17" LCD Monitor

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