1136Views14Replies

Author Options:

Does anyone know how to keep a monitor on without pc? Answered


I want to use the ccfl backlight as a light source for various goals, like a drawing box or secondary light for macro photography.

I know i want to remove the tft sheet to keep the ccfl backlight in white. But when you switch on a monitor, it auto enter in saving-mode without a vga signal.

How i can simulate this signal and keep it on? Thanks.

SOLVED!!! the monitor have three capacitors blowed. I changed and now it runs ok. so, IHave an old without-brand very bad 17" monitor stored.

INSTRUCTABLE HERE!!! 
https://www.instructables.com/id/Tracing-lightbox-from-lcd-monitor/

THANKS FOR ALL!!!

14 Replies

user
ARJOON (author)2011-01-02

try shorting the vga connector with a series of resistors. it might light up.

the best value would be a 10k, but you can also use potentiometers

Select as Best AnswerUndo Best Answer

user
Niord (author)ARJOON2011-01-03

You know which pins may i need to short??

Select as Best AnswerUndo Best Answer

user
ARJOON (author)Niord2011-01-03

usually it would be the first one and last one. if nothing happens connect a power source to it. las pin +ve and first pin -. start with a very low current. use a voltage of about 3.3v at first. by using a 10k pot increase the current until it turns on the screen. i've never tried it but give it a try. it may also not work. but just give it a try. i don't know if it can damage internal circuit. that why i will recommend you to start with a low current;

Select as Best AnswerUndo Best Answer

user
steveastroukBest Answer (author)2011-01-02

Since you have to open it up to remove the TFT, what are the connections to the CFL backligh controller ? Odds on its three pins, two will be a supply, the third the switch. See what voltages are on that connector.

Steve

Select as Best AnswerUndo Best Answer

user
AngryRedhead (author)2011-01-02

It seems like an awful waste of energy when you can use a CFL bulb to accomplish the same thing.

Select as Best AnswerUndo Best Answer

user

I think they want the display as an extended even illumination source, so a naked CFL won't do what they want.

Select as Best AnswerUndo Best Answer

user

I didn't mean random CFL dangling somewhere, but maybe something like this

Select as Best AnswerUndo Best Answer

user
Niord (author)AngryRedhead2011-01-03

Good idea, but i want something more compact, and goodlooking.

Select as Best AnswerUndo Best Answer

user
AngryRedhead (author)Niord2011-01-03

Throw your linens inside and stuff it under your bed, or build a more attractive wooden box with a frosted glass top and hang it on your wall as a modern wall sconce when not in use. You'll have to use or build a box one way or another.

Select as Best AnswerUndo Best Answer

user
Niord (author)2011-01-03

NEWS!! I wan`t to do this:

http://yesyes.info/diy/lightbox/

Only the lcd light part. Somebody can explain or scheme this circuit??

Select as Best AnswerUndo Best Answer

user
seandogue (author)2011-01-02

Failing a simple change of monitor settings via the desktop, try entering the bios settings (hardware settings) of the monitor to disable power savings mode. There are often buttons on the front of a standalone monitor with which you can enter hardware settings. Check it's manual or check online for one if you don't have. I operate a pair of older CRT monitors, one of which is becoming somewhat sketchy. I had to disable power saving mode in it because it loses sync

Select as Best AnswerUndo Best Answer

user
Niord (author)seandogue2011-01-03

I want to use it without pc, so i can`t enter in bios. lcd is broken...

Select as Best AnswerUndo Best Answer

user
Niord (author)2011-01-02

i haven`t open it. I don`t have time to do it.
When i open and test, i say something. Thanks for the speedy answers!

Select as Best AnswerUndo Best Answer

user
NatNoBrains (author)2011-01-02

Have you tried going through the settings of the monitor?

Select as Best AnswerUndo Best Answer