How to test laptop LED screen?

[katz]

How do you fellows test the LED screens or components? I see where I can buy some test unit from a laptop screen website for $230.00, but I don't know if that would cover all the different screens.

Also, I read on another site where a guy bought a replacement LED screen & cable & it still would not light up. He connected the screen to a TV that had the same type cable & the screen worked fine.

Apparently, there was a motherboard issue in his case. How can one rule that out before spending money on a replacement screen?

 

[Boston Pro Comp Serv LLC]

Connecting the laptop to an external, not fool proof but that would be one of the first things to do.

 

[compnet]

I have a cracked screen that works on every screen I've tried..

 

[katz]

Connecting the laptop to an external, not fool proof but that would be one of the first things to do.

What would be your next step? How to determine motherboard or other components as faulty before you spend $$$ on a replacement screen?

 

[Boston Pro Comp Serv LLC]

Make sure the backlight strip gets power from the board, try checking the cable seating, see if moving the cable clears the display, almost the same as an LCD. Plug in a known good screen.

 

[katz]

Make sure the backlight strip gets power from the board, try checking the cable seating, see if moving the cable clears the display, almost the same as an LCD. Plug in a known good screen.

Dumb question here; can I plug an LCD screen in to test an LED system, or are the cables/voltage/etc. different? I don't know that much about them, as I've not had to service an LED screen as of yet.

 

[Boston Pro Comp Serv LLC]

LCD's have a ccfl backlight, like a mini version of what most of us see in our shop ceiling. LED's have an LED strip of led lights for a backlight, so it doenst have an inverter, like the LCD does. I'm not sure if there are really any other differences but you won't get a backlight on an LCD screen even if you plug it into an led laptop, there no inverter to light it, and vice versa with the LED strip, no place to plug it in on a LCD laptop.

 

[14049752]

The terminology being used here is a little bit wrong...

"LED screens" are LCD screens with LED backlighting. "LCD screens" are LCD screens with CCFL backlighting. Both are LCD, the difference is the backlighting.. The "LED screens" don't display a picture using LEDs, the LEDs only light the LCD screen.. Make sense?



I keep a broken LED (backlit) screen on hand, because the connector is almost always the same. I quickly check with that, then rule out the cable and motherboard next if it still doesn't work. I'm working on building an LED tester...eventually...just never really got around to it.

 

[rsarceno]

How do you fellows test the LED screens or components? I see where I can buy some test unit from a laptop screen website for $230.00, but I don't know if that would cover all the different screens.

You don't need any fancy tools, just what every one else recommend should work. This is how I do things before but it doesn't look too professional when you do it on site. SO I invest on this gadget for $120

http://www.lcdparts.net/LST01.aspx

I also purchased the adapter so I can test both LCD and LED.

 

[Tucson Techie]

Neat gadget for $120. It could come in handy when you have the rare case of a blown backlight/motherboard fuse. In that case both the inverter and black would test good.

We're not replacing too many CCFL LCD's anymore. LED's are easier to test as we keep many semi-defective test units and carry the most common new LED's in stock now.

I'd be curious to know from previous poster who said he has one test LCD that has worked on every laptop he's used it on what the make/model of LCD it is.

 

[katz]

Just read this on another forum on eliminating the ccfl lcd altogether & upgrading the screen to led.

CCFL lit screens require an inverter but LED backlit screens don't, now you can convert any ccfl screen to LED when you purchase the additional cable converter, this means you won't need to use the inverter anymore and you'll have an LED backlit screen which saves more battery life and looks better too.

it's hard to find CCFL screens nowadays since they seased production about a year ago, and they became more expensive not because they're better but simply people wanna make more money of dumb people who are not advanterous and too afraid to convert to LED instead.

so buy the correct size LED screen and then buy the $8 converter cable which is universal and works with all types of lcd connections and you'll love it