Question about Proview PL926WBi 19" LCD Monitor

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Lcd invertor what is an lcd invertor?

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Hi,

If you are referring to an LCD inverter, this is a an electronic device that converts a low voltage DC into a high frequency high voltage AC. This output then feeds the Cold Cathode Florescent lamps (CCF) which in turn provides the necessary backlight to the LCD panel display. Most inverters are also coupled to a logic circuitry that triggers them OFF during video mute, sleep, hibernation. They can also be designed to supply multiple CCF lamps for LCD display that are 17" or bigger.
Most inverters are OEM products and it would not be surprising to find a Samsung inverter in a Toshiba LCD display.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Apr 21, 2008

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1 Answer

Why backlight going out?


maybe the problem is in the power sopply or the invertor in the lcd

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Hi.

The most common problem for this fault is the invertor failed.
The invertor is a HT circuit with 2,4,6,8, transformers on one or more of the tranformers will be open circuit.
Its relatively easy to replace but could be dificult & expensive to buy.

Chris..

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Uite, problema este in invertor, multiplicatorul de tensiune pentru alimentarea lampilor. Spune te rog ce condensatoare ai schimbat, in ce modul. De obicei (95%) aceasta problema e cauzata de transformatorul din invertor, cu timpul se deterioreaza sau se arde vreo bobina din interiorul sau si trebuie de sostituit cu altul nou. Si, vezi daca in invertor sunt rezistente variabile, incearca sa le reglezi putin.

Jun 06, 2011 | Acer AL511 15" Flat Panel LCD Monitor

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I have a 930b that started giving problems with the brightness fading in and out. Did this for couple of months and then went out completly. Blue lignt is still on. David Ayres davnit@bellsouth.net


You can try disassembly and look for bulging capacitors on power / invertor board,Also check the axial fuse between supply and Invertor transformer.
Samir.

Oct 15, 2010 | Samsung SyncMaster 930B 19" LCD Flat Panel...

1 Answer

I turn on my samsung syncmaster710 and it just has a black screen, with a faint (very faint box floating around it. is this a fualty backlight?


The backlight invertor seems to be defective.
Check the main power supply board for bad capacitors (visible damage ) and make sure that the invertor tubes do not light up for a moment when you power up the monitor ( in that case their probably is one or more light tube defective (burnt)) --

Sep 18, 2010 | Samsung SyncMaster 710N 17" LCD Monitor

1 Answer

I have a viewsonic monitor VX1962WM Model # VS11979 I turn it on and the screen go black in less then a min.


you probably have a bad invertor. you will need to open the case and replace the invertor

Oct 11, 2009 | ViewSonic VX1962wm LCD Monitor

1 Answer

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Problem is with invertor board.You need to open the monitor and check Invertor transistors 2sc5707.Test all 4 transistors and replace defective,also check /resolder associated circuitry.Also check fuse with PFxxx circuit reference no.
Samir

May 11, 2008 | BenQ FP767 17" LCD Monitor

1 Answer

HP Pavilion F1503 LCD Monitor


If you can see the backlight ,white 2pin connectors connect to invertor pCB.Look around these two connectors you should see 2 brown/yellow/red transformers with a ferrite core.These are the inverter transformers , resolder all pins and power transistors around it.
That should solve your proble.
Please provide feedback and rate this solution.
Samir.

Apr 07, 2008 | HP Pavilion F1503 15" LCD Flat Panel...

2 Answers

I Need and LCD Inverter for a Sharp 15" Monitor


Hi.

If you are in the UK invertors can be purchased from several internet outlets try this one http://www.chsinteractive.co.uk/

They do A universal one which will replace a lot of 2 tube invertor panels.

http://dysonmanuals.llc.nu/

Chris...

Dec 30, 2007 | Computers & Internet

2 Answers

LCD monitor problems.


Hi.

If the monitors use seperate plug in power supply EG 12 to 24volts it could be that at fault.
Or it could be the invertor at fault.
I have had some success repairing invertors if you can use A meter remove invertor Panels & check accross the coils with meter set to ohms all the coils should read identical chances are you will find one set of windings either dead short or open circuit. This will be the faulty coil hopefully as your monitors are all the same make the coils will be the same.
Carefully desolder faulty coil & fit one that reads good from a doner board.
Look for any SMD type fuses & check or replace them & thats it I have done quite a few now using this method.
Give it a go.

http://dysonmanuals.llc.nu/


Chris..

Dec 30, 2007 | ViewSonic VX910 19" LCD Monitor

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