[SOLVED] Lilliput 629, power but no image

RichIbizaSport · 05-31-2007, 09:26 AM

Hi guys. Before we start ive searched the forums for an age and still not come up with an answer

Ive just purchased a lilliput from a guy i know on another forum, it was working when he sent it, with pictures to prove.

Ive tried both a the cigarette lighter and the mains supply. Ive tried it connected to my laptop, pc, ps2 and dvd player.

It powers up fine, the power LED will be red when in stand by. I can turn the unit on by pressing power on the remote or the button on the control board. It will turn green when powered. I can then press any button on the control board and all the remaining green LED's will light up for 10 seconds. But absolutely nothing comes on the screen. Ive checked im getting power to the screen with a multimeter, im getting 0.2V AC via the power connector (2 wires). Ive checked the ribbon cables and all looks normal.

Any help would be greatly appreciated!

thanks

RichIbizaSport · 05-31-2007, 01:25 PM

If the ribbon cable connected to the screen is disconnected, should i still get a message on screen saying there no input or something? Or will the monitor be completely switched off if the ribbon cable isnt connected?

RichIbizaSport · 05-31-2007, 02:04 PM

Quick update:

This is where the "high voltage" wire connect to the LCD, pressumably for the backlight?

Ive found the manufacturing page for the LCD:

http://www.hitachi-displays.com/en/c...353_18541.html

It says that the supply voltage should be 3.3V

Surely less than 0.3V isnt enough? What could this mean?

bbalazs · 05-31-2007, 05:41 PM

Re-connect that ribbon cable. The display is dead without it.
Make a high contrast picture (eg. moving black box on white screen) and try to observe from different directions in sunlight or by a lamp.
If you can see a very dim, but obviously visible picture, the display is OK.
Backlight is totally independent.
The backlight voltage you try to measure is approx. 600V, but high frequency, so I am not sure it is measurable by a multimeter...do not touch the ends.

MatrixPC · 05-31-2007, 06:30 PM

Quote: Originally Posted by RichIbizaSport

Quick update:

This is where the "high voltage" wire connect to the LCD, pressumably for the backlight?

Ive found the manufacturing page for the LCD:

http://www.hitachi-displays.com/en/c...353_18541.html

It says that the supply voltage should be 3.3V

Surely less than 0.3V isnt enough? What could this mean?

That is for the backlight and more likely it went south.

RichIbizaSport · 06-03-2007, 01:33 PM

Well, i managed to find the problem. A night with the trusty multimeter and i found a nano fuse that was blown (no visible damage). I temporarily bridged the fuse with the thinnest wire i could find to see if it worked and it did. So ive bought the fuse from america, should be on its way now!

I have no idea how/why its blown as i havent connected it up with the wrong polarity nor have i used a wall adaptor with too many volts! :S

Yeah! :

Megalomaniac · 06-11-2007, 10:16 PM

I just ordered some fuses as well. How do you remove the old fuse nicely? Do I desolder it?

RichIbizaSport · 06-12-2007, 09:25 AM

My fuses arrived yesterday, and all went well.

MegaloRESE15" - Yes, you will have to desolder the old one. Its fairly easy with a steady hand and a small soldering tip. Melt the solder at one end and lift it up slightly with a pair of tweezers, then melt the other end and lift with tweezers once more and it should come straight off

burner86 · 12-14-2007, 03:55 PM

Quote: Originally Posted by RichIbizaSport

Quick update:

This is where the "high voltage" wire connect to the LCD, pressumably for the backlight?

Ive found the manufacturing page for the LCD:

http://www.hitachi-displays.com/en/c...353_18541.html

It says that the supply voltage should be 3.3V

Surely less than 0.3V isnt enough? What could this mean?

Think the problem is that you're measuring AC voltage, not DC as you should :P

nobb · 12-14-2007, 04:25 PM

If you connect your multimeter to a DC source, it will have the same reading no matter if its on the AC or DC setting (for my multimeter anyways). I think the AC setting simply makes the input voltage go through a diode rectifier so that the AC voltage is converted to a DC voltage which is then measured.

TheGemInIMan · 12-15-2007, 02:27 PM

Well in the Tech Sheet I got for the LCD panels I tried to get going it says I should get a reading of about 300-500Volts (rms) ... the lamp frequency will be between 20-60 Khz ... as this is pulsed by the lamp supply ...

Watch out for the Kick Off (turn on) voltage as that can be around 1000+ volts ...

Your's should have similar values ...

The 3.3volts is the power supply for the control board by the looks of it ... definitely not the lamp voltage ...

The voltage will be AC ... as it comes straight off the high voltage transformer of the DC/AC converter lamp supply ...

cheers,
Gem

vaige · 05-04-2008, 10:06 AM

hi, do you have a pic of the fuse? mine was black screen.. i dismantle the lcd and check .. suddenly i have display.. den it flickered and gone.. and came back awhile..and gone black blank screen again.. i den dismantle and reconnect a ribbon. after that.. its only white screen im getting.. any advise?

borikru · 08-19-2008, 05:15 PM

Hi,
Me too, would appreciate pic of this fuse, I am expriencing same issue.