If I run a wire from the controller to the metal housing wont this ground only the lcd controller board? I need to ground the lcd itself as well right? How?
Is it possible I did damage already by not grounding it or is this a safety feature built in. Does not light up if it detects it is not grounded?
Well, I tried connecting the backlight but that didnt work either. What is the inverter? Is if is also a board of some kind than it has been plugged in all the time. I even tried disconnecting the backlight board from the others. Right now all boards are connected. The actual backlight is not.
Hello,
I am new to this particular group (video), but the topic caught my attention.
So far everyone seems to be pointing only to the electronics being bad. But as the heading of this thread says "No picture without fresnel". That should give a clue.
About 20 years ago, I had an LCD device (I forget if it was a calculator or watch) that when I took it apart... displayed nothing until I put the tinted fresnel back on (I too thought I broke it)! I believe that it may be needed to allow only a certain polarized visual que through, which would be seen as the image. If you look closely (and I have seen this with other calculators and watches) many LCD displays have the fresnel, or polarized glass, fused right on the face.
Check it out. Just put the fresnel back in front of the LCD.
So go ahead and
me. But try it. You might end up with a big 😀.
Hope this helps!
Gabe
I am new to this particular group (video), but the topic caught my attention.
So far everyone seems to be pointing only to the electronics being bad. But as the heading of this thread says "No picture without fresnel". That should give a clue.
About 20 years ago, I had an LCD device (I forget if it was a calculator or watch) that when I took it apart... displayed nothing until I put the tinted fresnel back on (I too thought I broke it)! I believe that it may be needed to allow only a certain polarized visual que through, which would be seen as the image. If you look closely (and I have seen this with other calculators and watches) many LCD displays have the fresnel, or polarized glass, fused right on the face.
Check it out. Just put the fresnel back in front of the LCD.
So go ahead and
me. But try it. You might end up with a big 😀.Hope this helps!
Gabe
The lcd monitor came with a 1/4 inch plexi that has white dots spread accross it. Tried putting that behind and still nothing comes up.
Anyone else can help me?
Anyone else can help me?
lets go back to the begining when you turn the monitor on does
the tiny light light up?
if so what color?
do you have the video cable hooked up to a source?
if so do you have a live signal?
When you kooked up the backlights did they light up?
and can you take a better pic of that cable you say grounded the metal housing
and a pic of your powersuply ground
the tiny light light up?
if so what color?
do you have the video cable hooked up to a source?
if so do you have a live signal?
When you kooked up the backlights did they light up?
and can you take a better pic of that cable you say grounded the metal housing
and a pic of your powersuply ground
dracul
dracul becarful man the inverter puts out 300 - 600volts, a shock off of that is nasty, dont poke wires around while the thing is on and dont touch any ic's without grounding yourself as they can blow out from the electricity in your body, never fool with it while its on! and ground wires should not touch anything other than the screw hole with copper on it, cos if it does and shorts a ic or another component u are out of an lcd my friend, take some wire, get a couple of small bolts, put one wire from the lcd controller board to the main controller they have to contact the copper on the screw holes, the bolts will hold these there now turn it on if no go take another bit of wire and conect it to the main unit housing from the first controller board again do the bolt back up, if still no go take a wire from the lcd frame to the lcd controller ground, if still no go try the last thing wich is try to conect all of the holes with copper up together then run a wire from the lcd right back to the main housing so all is grounded, make sure there are no shorts, turn on and if there is still no go well good talking to ya lol
Trev
dracul becarful man the inverter puts out 300 - 600volts, a shock off of that is nasty, dont poke wires around while the thing is on and dont touch any ic's without grounding yourself as they can blow out from the electricity in your body, never fool with it while its on! and ground wires should not touch anything other than the screw hole with copper on it, cos if it does and shorts a ic or another component u are out of an lcd my friend, take some wire, get a couple of small bolts, put one wire from the lcd controller board to the main controller they have to contact the copper on the screw holes, the bolts will hold these there now turn it on if no go take another bit of wire and conect it to the main unit housing from the first controller board again do the bolt back up, if still no go take a wire from the lcd frame to the lcd controller ground, if still no go try the last thing wich is try to conect all of the holes with copper up together then run a wire from the lcd right back to the main housing so all is grounded, make sure there are no shorts, turn on and if there is still no go well good talking to ya lol
Trev
That looks like BenQ (AUO) panel. This is a known issue - if you minded search the forum first you would have learned the solution. You need a thick wire from the panel PCB ground (the mounting holes are ok) to controller board ground.
"lets go back to the begining when you turn the monitor on does
the tiny light light up?
if so what color?" Yes, yellow same color as when it was working assembled.
"do you have the video cable hooked up to a source?
if so do you have a live signal?"
Yes, vga from a computer. Tested before dismantle worked fine.
"When you kooked up the backlights did they light up?"
If you mean now after the dismantle the answer is no. But I am not sure if I hooked up right. cables are correct but I did not ground the backlight. I guess I will show you some pix of this too.
"and can you take a better pic of that cable you say grounded the metal housing
and a pic of your powersuply ground" OK.
ace3000,
"put one wire from the lcd controller board to the main controller"
Which board would be the main controller? The board that has the power supply ?
"if no go take another bit of wire and conect it to the main unit housing from the first controller board again do the bolt back up"
I am not sure what you are calling the first controller board. The first board that takes the power in then passes it to the other boards yes?
"if still no go take a wire from the lcd frame to the lcd controller ground"
There is no lcd frame anymore just a bare lcd glass. But there are some metal contacts sticking out the side from what looks like ends of ribbon cables see photos. You want me to join a wire to this and the other end to the same spot where the lcd controller is grounded on the metal housing?
"make sure there are no shorts"
What does this mean exactly?
mhelin,
"That looks like BenQ (AUO) panel"
No, its a Dell 1504fp monitor but the panel says Sharp.
"You need a thick wire from the panel PCB ground (the mounting holes are ok) to controller board ground."
What is panel PCB ground?
"to the controller board ground" You mean connect a thick wire from the raw lcd to the lcd control board mounting holes?
The lcd is just glass now. There is no mounting holes or anything.
the tiny light light up?
if so what color?" Yes, yellow same color as when it was working assembled.
"do you have the video cable hooked up to a source?
if so do you have a live signal?"
Yes, vga from a computer. Tested before dismantle worked fine.
"When you kooked up the backlights did they light up?"
If you mean now after the dismantle the answer is no. But I am not sure if I hooked up right. cables are correct but I did not ground the backlight. I guess I will show you some pix of this too.
"and can you take a better pic of that cable you say grounded the metal housing
and a pic of your powersuply ground" OK.
ace3000,
"put one wire from the lcd controller board to the main controller"
Which board would be the main controller? The board that has the power supply ?
"if no go take another bit of wire and conect it to the main unit housing from the first controller board again do the bolt back up"
I am not sure what you are calling the first controller board. The first board that takes the power in then passes it to the other boards yes?
"if still no go take a wire from the lcd frame to the lcd controller ground"
There is no lcd frame anymore just a bare lcd glass. But there are some metal contacts sticking out the side from what looks like ends of ribbon cables see photos. You want me to join a wire to this and the other end to the same spot where the lcd controller is grounded on the metal housing?
"make sure there are no shorts"
What does this mean exactly?
mhelin,
"That looks like BenQ (AUO) panel"
No, its a Dell 1504fp monitor but the panel says Sharp.
"You need a thick wire from the panel PCB ground (the mounting holes are ok) to controller board ground."
What is panel PCB ground?
"to the controller board ground" You mean connect a thick wire from the raw lcd to the lcd control board mounting holes?
The lcd is just glass now. There is no mounting holes or anything.
Ok I got some news that sounds familiar with a grounding issue I read on this site elsewhere.
Everything still desmantled, I tried hooking up the backlight again and this time it fired up, stayed on for 3 seconds then went off.
Does this confirm I have grounding issues? Should
the same thing not happen to the lcd screen then?
I tried running a wire from the lcd controller first to the same ground point of the metal housing that comes with from the shop.
Then I tried running the same cable from the lcd controller to each of the other boards in the metal housing. There was no gold copper point where the screws go on these boards so I hope all is ok. I took a lot more pix(hopefully clean this time?I will post soon as I can develop and scan today hopefully.
I also tried grounding the backlight to see if this would solve it. I took a wire from a metalic point on the backlight frame and took it to the metal housing. I dont think this was grounding it because it still went off and also the metallic point seemed aluminum. I could not see any copper to hook to.
How would I ground the light to see that this would solve it?
Everything still desmantled, I tried hooking up the backlight again and this time it fired up, stayed on for 3 seconds then went off.
Does this confirm I have grounding issues? Should
the same thing not happen to the lcd screen then?
I tried running a wire from the lcd controller first to the same ground point of the metal housing that comes with from the shop.
Then I tried running the same cable from the lcd controller to each of the other boards in the metal housing. There was no gold copper point where the screws go on these boards so I hope all is ok. I took a lot more pix(hopefully clean this time?I will post soon as I can develop and scan today hopefully.
I also tried grounding the backlight to see if this would solve it. I took a wire from a metalic point on the backlight frame and took it to the metal housing. I dont think this was grounding it because it still went off and also the metallic point seemed aluminum. I could not see any copper to hook to.
How would I ground the light to see that this would solve it?
dracul ok we are gettn some where now
that light should be green if you are grounded corectly and recieving a signal
now when you hooked up the backlight did you hook up bolth bulbs?
i had the same isue when i only hooked up 1 bulb it ran for a
few seconds the shut off i needed bolth bulbs connected
to stay on
and wheres the pix you promised i need to see all the grounding points
that light should be green if you are grounded corectly and recieving a signal
now when you hooked up the backlight did you hook up bolth bulbs?
i had the same isue when i only hooked up 1 bulb it ran for a
few seconds the shut off i needed bolth bulbs connected
to stay on
and wheres the pix you promised i need to see all the grounding points
dracul when you ground the horizontal driver board on the lcd that grounds the lcd itself there is no other place to ground the lcd
those 3 ribbons sticking out of the lcd are not to be grounded
what so ever they are the verticle driver circuts and do not require grounding
the horizontal driver board on the lcd is the only ground you need on the lcd
what so ever they are the verticle driver circuts and do not require grounding
the horizontal driver board on the lcd is the only ground you need on the lcd
It was blue or same color as my MH bulb. Why would it be green? Hmmm.
Yes I hooked up both ends of the backlight to the backlight board. Got photos to show this also.
I got the photos developed I am just waiting for the scanner to be available at the internet cafe right now.
I already tried grounding from the horizontal lcd controller board to every board as well as the metal housing as well as the exact same spot the power switch is grounded to by default from the shop. No Go.
i was talking about that little light that you said was yellow
should turn green when theres a signal and is connected corectly
but if you have everything grounded to the powersuply ground
then you only have 1 choice and thats to put it back together and try it
if it still dosent work,then there was some damage caused in
the dissasembly
but im still interested in those pics
should turn green when theres a signal and is connected corectly
but if you have everything grounded to the powersuply ground
then you only have 1 choice and thats to put it back together and try it
if it still dosent work,then there was some damage caused in
the dissasembly
but im still interested in those pics
- Status
- Not open for further replies.