Question about HP 418446-001 - HP Special Edition L2000 Series Full Featured Laptop Systemboard for

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Lcd inverter doesnt receive input voltaje from motherboard

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Please refer to the following article for tips on diagnosing & fixing the issue:
http://www.fixya.com/support/r6430776-troubleshooting_laptop_power_failures

Posted on May 22, 2011

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Posted on Jan 02, 2017

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Phillips lcd tv screen is black. have power light and can see image with the flashlight test


Email hola tu tv parece ser que se quedo sin luz de fondo o backlight revisa la alimentaci?n del inversor y el inversor este ultimo parece q no esta trabajando cuidado los inversores trabajan con alto voltaje yo tu buscaba ayuda profesional , saludos...

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If you can see the icons but the screen is mostly black ( you have to look real close to see the desktop or windows logo) most likely you need a new lcd inverter. I repaired a 1300 series laptop, that had a dark screen, not black, just darker, and the fix was a new motherboard. That would be the second option if replacing the lcd inverter doesnt work. Lcd inverter is about $10 Motherboard is around $50-65 for that model on ebay.

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Black screen is a number of things.
*If you`re laptop turns on but you see no display at all..does`nt even post,Then its the GPU on you`re motherboard thats faulty & will need replacing. Or
*Its you`re screen inverter which is a small circuit board located inside on the bottom of you`re LCD screen which needs replacing.Theyre cheap and not expensive.
*Do a test for example : Connect you`re laptop to a PC monitor Via VGA to VGA cable.Connect to youre laptops PC input to your monitor PC input,Then turn you`re laptop on.If it displays on you`re monitor then its the problem with your LCD laptop screen,Or the inverter needs replacing.
If theres no display on the pc monitor then its You`re motherboard onboard GPU (graphic Card) - Which you will need to replace the motherboard.

Oct 18, 2010 | Acer Aspire 5500 5570-2609 Laptop

1 Answer

Hello, I am trying to fix the monitor LG L1951s that does not power on, I found the 68uF*450V capacitor bad, replaced this one but problem ramains. I have measured most of the componets on the power board...


The 68UF 450 is for the primay smps driving side, are you getting about 160vdc on that cap?
The PWM IC get the kick start DC voltage from the main bridge rectifier thorough a bunch of high resistance resistor to drop the 160vdc down to aboit 15vdc, once the PWM IC start working, one the winding will be the supplying the voltage to the IC to keep it running. If the DC output side detect short cirsuits (drawing too much current) it will go into shutdown, you need to find out if the inverter circuits has short circuits. The 5vdc and the 12~18vdc power supply will be running the minute you plug it in, you can solder in a 12v bulb at the DC output that feeds the inverter circuits (you can solder it directly on the DC filter caps for the 12~18 VDC filter caps of the inverter circuits). See application notes how this IC is used.
http://www.fairchildsemi.com/an/AN/AN-4129.pdf
http://www.fairchildsemi.com/ds/FA%2FFAN7601.pdf

No blown MOSFET on the primay side?
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

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plug in a monitor in the side of the laptop if it shows up then the lcd is bad. Also try and reset the memory by pulling it out and then put it back in if not in all the wall nothing will appear on the LCD.

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1 Answer

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its either going to be a problem with the lcd, inverter or output from the motherboard probably.

Best thing to do is to try a different lcd with a different lcd cable, then if that doesn't work, then try to get a different inverter, if that doesn't work then you'll know for sure its the output coming from the motherboard.

Alot of times the LCD's go bad but the lcd cables go bad cause they are flimsy and the wires break inside.

Look on Ebay cause you can easily get these parts cheaper then most places.

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Dear Friend:
There is a Switch transistor to power on -off the hi voltaje for lights. Check 15V from power source go to this transistor colector, Using soldering Iron, make a juntion between colector and emiter, to short 15V to Hi voltaje power. I´m fixing 10 monitor the same trouble. I will remove a liter transistor.
Late I will post here the driver transistor number, and the replace number transistor I will use.
Pictures , etc. Best Regard

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