Powering LCD

vcbb5 · 10-31-2003, 11:26 PM

Does anyone power their lcd from one of their computers +12v power leads?

before

pops up 10 times, i did but searching for "lcd" and "power" brings very mixed results

ciagon · 11-01-2003, 12:05 AM

Quote: Originally Posted by vcbb5

Does anyone power their lcd from one of their computers +12v power leads?

before

pops up 10 times, i did but searching for "lcd" and "power" brings very mixed results

Yea, its a common practice. If your dc-dc regulator does not regulate 12v, it is the same as wiring it to your battery / fusebox / cigarette lighter.

--Tom

shakes · 11-01-2003, 01:58 AM

yeah you definately want to get it fed from a regulated 12v source

vcbb5 · 11-01-2003, 08:09 AM

so is the comp p/s regulated? What is a non-regulated source?

eminence · 11-01-2003, 09:02 AM

A source that will not allow voltage above 12v to come through the line. So it won't fluctuate or spike when devices are turned off else where in the car or when the alternator is producing a higher voltage.

It will protect the device from too higher voltage basically. Well that is my understaning anyway.

Simon

Sh0cker · 11-01-2003, 09:21 AM

I'm using power supply to give all juice to my lcd, yellow lead gives +12 and enough current to support 4ccfl lcd.

shakes · 11-01-2003, 11:03 AM

Quote: Originally Posted by vcbb5

so is the comp p/s regulated? What is a non-regulated source?

the car's battery is not regulated. it will swing from 8 to 14+ volts. you need to regulate this to a constant 12v before applying it to your mobo. if you use a dc-dc converter that will regulate it ... if you're using a inverter and a normal ps ... that will regulate it

if you are using just a normal ps likw the pw60 and pw70 ... they are not regulated and you need to regulate the power before the ps.

ciagon · 11-01-2003, 10:07 PM

Quote: Originally Posted by shakes

the car's battery is not regulated. it will swing from 8 to 14+ volts. you need to regulate this to a constant 12v before applying it to your mobo. if you use a dc-dc converter that will regulate it ... if you're using a inverter and a normal ps ... that will regulate it

if you are using just a normal ps likw the pw60 and pw70 ... they are not regulated and you need to regulate the power before the ps.

Even though it is best to have regulated DC, it is not always required. In my last carputer, I ran an NTSC screen off straight battery for over a year. My friend did the same. Just make sure you disconnect it if you ever jumpstart your car.

These were cheaper TFT NTSC LCD's, so I was not too worried about them blowing up. For my new lilliput, I am giving it regulated 12v.

shakes · 11-02-2003, 12:39 AM

Quote: Originally Posted by ciagon

Even though it is best to have regulated DC, it is not always required.

this is true. especially if you are using all laptop components you can run 14v through a pw-70 and no harm should occur. Laptop drives only use the 5v rail so nothing will be pulling off of the 12v rail to be damaged.

and yeah you could also do the screen like that. give it long enough and it will die unless the manufacturer has accounted for it and has a reg inside the lcd circuits.

if I'm spending $500 on something I'd rather not chance it but, like you said... they were cheap so no worries.

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