Question about Proview PL913S 19" Flat Panel LCD Monitor
I have a 19' Proview LCD display. Recently it startet turning off by itself after working for 4-5 sec.We connected it to another pc and the display acted the same way - it worked for 4-5 sec, then it turns off. We have to press the on/off buton to turn it on, works for 4-5 sec and then goes black again.
I would look on the power supply board and check for any capacitors that are bulged or popped. They look like little barrels with a cross or 3 line star on the top. This is the vent and it should split before the capacitor pops like a firecracker or blows its top off like a bottle of shaken champagne. I bet you have 8 bulged or popped caps on the P/S and they can be replaced at about .30 cents a piece and a soldering iron. Just make sure you get the right farrad ratings, like 470 micro farrad and get them rated to 105c for heat resistance. Most are 25V but you can use the more common 35V safely. If you are going to toss the monitor in the trash, do yourself a favor and at least spend 30 minnutes looking into these. It may save your monitor. If the lamps even light for a few seconds, its not the lamps. If the inverter is bad, you would get no light. the starting of the lamps takes lots of voltage, keeping them going is about 1/4 of the start voltage so if they start, the inverter is doing its job.
Posted on Apr 08, 2008
I've got 2 identical 17 inch Proview MA-782K s with the screen blanking after a few seconds problem, just done one with new caps and its all running well again.
Pulled the other to bits and its completely diiferent in side.
Done the caps & still the problem remains, pulled the whole screen to bits right down to the light tubes and LCD taken out.
Put the tubes in the other monitor and they work perfectly so tubes ok , so most likely its the invertor
Put the invertor on the other Monitor , even though different design inside still the same connectors.
and the screens blanks out so it has to be the Invertor.
As the invertor has a PSU, a trigger section and a pair of high volts sections, with both tubes going out its either the PSU or the trigger thats at fault, unlikely both high voltage drivers section going down together.
Hope this info helps someone. now off to dig deeper out whats going on.
Maybe try some other caps
Posted on Nov 21, 2008
The problem here is simple no one knows how to replace the caps properly,
1 you must de-solder cleanly and leave little solder behind there is a tool to **** solder off the board for the few sec it is hot for 7 dollars it is worth it
2 cap replacement is important the negative side is marked on the cir. board always. the caps must be placed back exactly as they were taken out or you will damage the transistors and other components on the board. so 1 at a time.
3 you must be careful to solder only the pin to the hole area this is not a sandwich...
4 inverter lamps last 60000 hours I have only had to replace 1 lamp in a laptop in 10 years of service work. and yes the ends get burned just like those big 4 foot jobs in the ceilings at schools and office buildings.
5 if you can find 105 c temp caps great more power to you but 85 c caps work just as fine unless you have the house open and work in cuba.
Posted on Nov 03, 2008
Dude ck this out if you don't know how to solder you will, do more damage then good. To much heat will ruin a circuit board there's a plastic coating that melts from the heat. So be extra careful!!! I do like the info about the caps being swollen but that doesn't always solve the problem have not tried to take lamps from scanners and modify to fit think I'll try that Let you all know in a few days if it works.
Posted on Jun 29, 2008
I ordered the capacitoes from mcm.com after driving to every radio shack in town. i bought a few extras just in case i did something wrong. i unsoldered the old ones, but did not really pay attention to which way they were plugged in. i replaced the old with the new with ease but when i put it all back together and plugged it in the power light went on for a second. the screen was still black but if i played around with the power cord plugged into the back, i could kind of see the screen dimming up a little bit. i figured that i just resoldered something too loosly and gave it another try. this time i tried to figure out which was the capacplugged in. it said the the stripe on the capacitor should be on the dark die of the mark on the board that they solder to. i did that, put it together and plugged it in. this time absolutley nothing. my question is, is it possible to mess the whole thing up if some solder gets on the other parts of the circuit board? was i determining the placement of the capacitors wrong? in actuality, the capacitor plugs in to the board on top of cirlces that have white shaded on one side and nothing on the other. the side with nothing is the color of the circuit board ( brown ) so maybe that is the side i was supposed to match with the stripe on the capacitors. all that i know is that so far it has cost mearound 30 dollars to buy parts and a soldering iron and i have spent at least four hous of time taking it apart and putting it back together. i should just go buy a new one at this point but none of the new capacitors appear to be blown out or bulging. so if some one could tell me exactly how the capacitors go in, i might try to re do it one last time. i could take a picture and post in on myspace if anyone thinks that may help. in the meen time. thank you and good luck !
Posted on Apr 08, 2008
When you screen goes off after 3-4 sec. It's more likely that the life of your Neon Lamps is over (Probably the lower pair). Not the inverter.
A defective Inverter would not light it up at all or for a maximum of half a second.
When you tunr it ON, try to see if something completely white seems to appear slightly pink (Ex: the "No Signal" over the blue screen should be in clear white.)
BTW, Your monitor didn't go off. Only the backlight is not working. Just take a look closer, You'll see the image is still there but All dark.
I repair LCD for years.
Unfortunately, its the worst case it could have happened to you.
Since the whole screen doesn't sells for cheap, you'll need to change them yourself and *fit* em into the old metal case that goes into the backlight assembly.
Warning : Its really risky to try to change it by yourself *IF* you find the right lamp for replacement of the original.
Even Bending the Image Panel flat wires can permanently damage your LCD. (Vertical white line).
If you dont know what you are doing, DONT DO IT.
Posted on Mar 03, 2008
I READ BEFORE THAN THIS LCD MONITOR HAVE PROBLEMS WITH THE CAPACITORS OR THE INVERTER. THE CHEAPEST SOLUTION IS CHANGE THE CAPACITORS FOR NEW ONES. MORE INFORMATION LOOKIING AT GATEWAY LCD PROBLEMS. ITS NOT THE SAME BRAND BUT REMEMBER , ALMOST ALL MONITORS WORK EQUAL.
Posted on Dec 08, 2007
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