Question about ViewSonic VX900 19" LCD Monitor

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I need to replace one of the fuses on the inverte board. What size do i purchase.

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I use 2.5A PICO fuse, but before wasting new fuse due to short circuits you should solder in a 1/2w MOX resistor in place of the fuse and measure the voltage drop across the resistor so you can calculate the current draw by the circuits, if the resistor burns up right away, then you have shorted out output transistors in the transformer driving section. Also check the two large electrolytic caps also, if they are bad, it will cause the fuse to blow also due to high frequency oscillation.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX900/?action=view&current=DSCF1063.jpg

http://s807.photobucket.com/albums/yy352/budm/PICO%20fuse%20by%20Littlefuse/

Basic LCD monitor and LCD TV troubleshooting guide:

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV, Monitors, Caps : http://s807.photobucket.com/home/budm/allalbums

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitor kits: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.

Posted on Nov 07, 2010

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Posted on Jan 02, 2017

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1 Answer

The picture and sound come on then a few seconds later the picture goes off to black screen and sound stays on can you help please


hi,
Is there is any light in the screen at the time picture gose. If not, then Backlight inverter is faulty. All lcd tv have backlight to light the pixels. If you watch the screen very near then you will be able to see image on the screen. First of all check is there is any budged capacitors in the power supply. If there then replace it will solve the problem. If no then check the inverter board. Do on thing check the fuse in the inverter board. If the fuse is faulty then replace it. If the fuse blews again then the inverter board is short you have to replace invereter baord. It is not possible to repair the backlight inverter. You have to replace the board with a new one.Have added the picture of inverter board and budge capacitor for your reference. If you need any more assistance feel free to contact me by Fixya.



ajin_g_97.jpg ok

Sep 19, 2011 | Televison & Video

1 Answer

I lost my picture n all I see is a black screen. What could the poblem be and is it fix able.


hi,
Is there is any light in the screen. If not, then Backlight inverter is faulty. All lcd tv have backlight to light the pixels. If you watch the screen very near then you will be able to see image on the screen. First of all check is there is any budged capacitors in the power supply. If there then replace it will solve the problem. If no then check the inverter board. Do on thing check the fuse in the inverter board. If the fuse is faulty then replace it. If the fuse blews again then the inverter board is short you have to replace invereter baord. It is not possible to repair the backlight inverter. You have to replace the board with a new one.Have added the picture of inverter board and budge capacitor for your reference. If you need any more assistance feel free to contact me by Fixya


ajin_g_82.jpg ok

Sep 07, 2011 | Polaroid TLA-04011C 40 in. LCD TV

1 Answer

Lcd television has sound but no picture wat could be the problem in the circuitry.is it the lcd


hi,
. Is there is any light in the screen. If not, then Backlight inverter is faulty. All lcd tv have backlight to light the pixels. If you watch the screen very near then you will be able to see image on the screen. First of all check is there is any budged capacitors in the power supply. If there then replace it will solve the problem. If no then check the inverter board. Do on thing check the fuse in the inverter board. If the fuse is faulty then replace it. If the fuse blews again then the inverter board is short you have to replace invereter baord. It is not possible to repair the backlight inverter. You have to replace the board with a new one.Have added the picture of inverter board and budge capacitor for your reference. If you need any more assistance feel free to contact me by Fixya



ajin_g_62.jpg

ajin_g_63.jpg

Aug 23, 2011 | Televison & Video

1 Answer

Power light comes on but nothing on the screen.I am in Ballito South Africa


hi,
Is there is sound on your tv. Is there is any light in the screen. If not, then Backlight inverter is faulty. All lcd tv have backlight to light the pixels. If you watch the screen very near then you will be able to see image on the screen. First of all check is there is any budged capacitors in the power supply. If there then replace it will solve the problem. If no then check the inverter board. Do on thing check the fuse in the inverter board. If the fuse is faulty then replace it. If the fuse blews again then the inverter board is short you have to replace invereter baord. It is not possible to repair the backlight inverter. You have to replace the board with a new one.Have added the picture of inverter board and budge capacitor for your reference. If you need any more assistance feel free to contact me by Fixya.
OK




ajin_g_58.jpg
ajin_g_59.jpg

Aug 21, 2011 | Sharp Aquos LC-37GD6U 37 in. LCD HDTV

1 Answer

What size fuse for replacement?


if it is used with 12 Volt battery, then
if fuse it to be connected on battery side, then it should be of at least 50Amp
but if is to be connected to AC supply side, then it can be of 3 to 4 Amps...
enjoy

Mar 06, 2011 | Vector Power on Board 500 Watt Power...

1 Answer

One of the tiny fuses in my Viewsonic VX900 monitor has blown. What is its part number, and where can I purchase a replacement? In addition, if I have to replace the entire inverter board, what is its...


I replace the surface mounted fuse with axial-lead fuse, PICO fuse made by LITTLEFUSE. You can try using a 1 Ohms 1/2 watt flame proof resistor in place of the fuse, if the resistor get real hot and burnt up then it may have shorted Transistors or transformer. You can get the number of the board and go to www.lcdparts.net to see if he has the inverter board in stock.
http://s807.photobucket.com/albums/yy352/budm/PICO%20fuse%20by%20Littlefuse/

http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX900/
http://en.wikipedia.org/wiki/Capacitor_plague

Sep 03, 2010 | ViewSonic VX900 19" LCD Monitor

2 Answers

Acer al1711


We have repaired a couple of these. R1 on board normally burnt also C6 and C22 bad on inverter board. Replace these and it will probably work. R1 is 10 ohm. Capacitors are 220uf 25v.

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3 Answers

Power inverter


Most likely a fuse. Check for a fuse on the inverter itself or one inline with the plug. Usually you can screw off the tip of the plug and replace the fuse inside.

Sep 23, 2008 | Electronics - Others

1 Answer

GE Profile Harmony Clutch probs./Invertert PCB history


Your inverter board is operating 7 degrees over the max temp...

Clear this error be exiting the service mode and run set up ...
if it comes back you will need to replace inverter board....

let me know if you need more help...

Jul 30, 2008 | GE Profile Harmony WPGT9360E 4.0 Cu. Ft....

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