Envision G918w1

[freakytiki4u]

I have a 19" Envision Flat Panel Monitor, Model G918w1.
I can see the screen perfectly for about 1.5 seconds and then it goes dark.
Flashlight test reveals the desktop is still there, its just dark. Bad inverter board?
There are no swollen caps and no burn spots on the board, doesnt appear to be any dry solder joints that I can see. Any help is greatly appreciated.
Phtos of the board are attached.

[PlainBill]

Re: Envision G918w1

I have a 19" Envision Flat Panel Monitor, Model G918w1.
I can see the screen perfectly for about 1.5 seconds and then it goes dark.
Flashlight test reveals the desktop is still there, its just dark. Bad inverter board?
There are no swollen caps and no burn spots on the board, doesnt appear to be any dry solder joints that I can see. Any help is greatly appreciated.
Phtos of the board are attached.

It's an example of the type of board we're going to be seeing a lot more of. They've combined the power supply, inverter, and the logic card onto one board. And by Envision. Oh, joy!!!

Four points circled in red are the return lines for the CCFLs. Measure the AC voltage from each point to ground while the backlights are on. Do this several times, report all four voltages. (We're looking for one or two that are way different. These should read under 5 volts, but start on the highest voltage range for each pin. Certain failures could put 700 volts on that pin. You may be able to contact that point from the top side of the board - look at the connectors.

Four points circled in yellow are the transformer secondary. Measure the resistance from each one to ground with the power off!! Then measure the resistance across the top pair, and across the bottom pair, again with power off.

I would like the part numbers on the three ICs circled in blue. The two together are the drivers for the transformers; the one by itself is the inverter controller.

PlainBill

[freakytiki4u]

Re: Envision G918w1

Sorry it took me so long to get back to this post. I noticed the "AC" in dark letters , LOL (bangs head on desk) you have a very good memory. I still want to hear "The TV Story" you have. :P
As far as monitor goes, I found out Envision have a 3 year warranty on their monitors and they gave me an RMA, so im going to just send it in to them.
I could not tell what the numbers were that you asked me for, they were sorta erased off. I have a lens I can use to look closeup at things that little but even that didnt help me see the numbers clearly. Thank you for the info and go ahead and tell me the TV Story please. :P I need a good laugh today.

[PlainBill]

Re: Envision G918w1

Sorry it took me so long to get back to this post. I noticed the "AC" in dark letters , LOL (bangs head on desk) you have a very good memory. I still want to hear "The TV Story" you have. :P
As far as monitor goes, I found out Envision have a 3 year warranty on their monitors and they gave me an RMA, so im going to just send it in to them.
I could not tell what the numbers were that you asked me for, they were sorta erased off. I have a lens I can use to look closeup at things that little but even that didnt help me see the numbers clearly. Thank you for the info and go ahead and tell me the TV Story please. :P I need a good laugh today.

OK, you have the advantage of me. Where did I mention a TV story? Maybe that will trigger some of the nearly dead synapses.

PlainBill

[freakytiki4u]

Re: Envision G918w1

A few posts back I was checking the voltage on a monitor and when I told you it was 10 volts DC you said "DC?" and I was like, I mean AC (coff). When u said it should be tested on AC I was embarassed and I asked you not to tell anyone and you said you wouldnt because then I would tell everyone your TV story. I was assuming one day you might have charged your own batteries while working on a TV or something like that. lol

[PlainBill]

Re: Envision G918w1

A few posts back I was checking the voltage on a monitor and when I told you it was 10 volts DC you said "DC?" and I was like, I mean AC (coff). When u said it should be tested on AC I was embarassed and I asked you not to tell anyone and you said you wouldnt because then I would tell everyone your TV story. I was assuming one day you might have charged your own batteries while working on a TV or something like that. lol

Ah!!! No, it was worse than that. This was one of those incidents that tests ones character in multiple ways.

First, a story, originally told by the farm reporter for a Minneapolis radio station. A couple of constants of farm life in the northern tier of states a half-century or more ago are 'haying', and 'butchering'.

Haying involves cutting the hay, allowing it to dry, stacking it on wagons where it is pulled to the front of the barn, then up to the hayloft by a block and tackle arrangement. The primary source of power before WWII was horses.

Butchering involves leading a steer to the front of the barn, killing it, then hooking it up to the hay lift and raising it clear of the ground, where the intestines and hide are removed, etc. after that the carcass is raised high enough theh farm dogs can't reach it while it chills overnight. This usually involves a group of farmers combining forces under the theory that many hands make light work.

One crisp fall day the group meet at Emile Johnson's farm. Emile is a very quite Swede who never curses. Friendly, he is always ready to help his neighbors. So the steer is slaughtered, raised to a working height, eviserated, the hide removed. Then Emile's son is told to lead the horses (to raise the carcass higher) until he is told to stop. The carcass is raised 10 feet, the son is told to stop the horses, but he doesn't pay attention. When the rope hits the top there is a jerk, and the carcass drops back down into the pile of entrails lying on the ground; a real disaster. All the other farmers are standing around, looking at Emile, all thinking "If anything makes him curse, this will be it."

Emile just stands there staring at his family's supply of meat for the winter lying there, ruined. Finally he lets loose with the strongest language anyone had ever heard from him "Oh, my goodness".

My own incident was much less devastating. This was in the 1970's, when my source of additional income was repairing TVs. One of my co-workers brings in a 12" black and white TV that he had tried to repair, but failed. He even had the Sam's Photofact schematic. I open the set up and quickly realize there is no horizontal output. I check the horizontal oscillator / output tube; it's good. This particular set had all the component locations marked on the bottom of the circuit board, so I stand the set upside down and start tracing. Hmm, no B+ at the oscillator, but it's present at the filter cap. A few minutes later I hit a point where the line from the B+ supply suddenly dropped to 0 volts at a resistor. Unplug it, measure the resistor, yep, it's open - a common problem with the Japanese film resistors of that decade. I turn around to my parts bin, grab the proper resistor to solder it into place, and turn back in time to see the TV roll off the workbench and land on it's back, snapping the neck of the picture tube.

I don't have Emile's restraint.

I did replace the TV. Of course, the story quickly made it's way around work. The only humor I got out of the situation was a few months later the co-worker was standing on a stepladder in his garage, driving a nail. He overbalanced as he was swinging the hammer, reached out to steady himself, and hit himself on the hand, breaking two fingers. I did my best not to smile.

PlainBill

[freakytiki4u]

Re: Envision G918w1

LOL, thank you Sir. I will share a story with you that actually happened to me. It has little to do with Electronics but still funny none the less. Forgive the long read but I think you will find it worth it. A few years ago this actually happened to me.....


This morning I wanted to kill someone but now it's sort of getting funny to me.

Last night "Dear Ole Wifey" cooked chili for the masses. I mean, she made about 5 gallons of chili and took 2 gallons to work to share and left the other 3 gallons for us. This morning when I woke up all I could think about was chili and Jalapeno corn bread for breakfast (yes I know, weird.) So, after getting showered and then dressed in clean clothing, I fixed a glass of tea, and started heating the chili and corn bread. With everything nice and steaming hot and set it in the bowls, I got 1 napkin (I'm not a messy eater).

I took all that to my office and opened incredimail to enjoy my 2 favorite things,
Email and Breakfast.

I went back out to put away the remaining 2 and 1/2 pounds of chili and low and behold.........as I was putting it back in the fridge, somehow, it slipped.

As it was tumbling to the floor in slow motion and I was trying my best to break every bone in my body to catch it before it hit the floor, I was thinking, its ok, the Tupperware lid is on, it will not spill.

Commercials are never true..... especially Tupperware commercials. Trust me on this one.

The gargantuan bowl of chili hit the floor (a tile floor no less) at mach 5 and that lid snapped off there like a tree in a tornado!

Puddin (my cat, who was standing directly at my feet) took about 1 pound of chili right in the kisser! I wish you could have seen the look on her face (after the chili fell off it)! I'm still not sure who was more pissed off. Me or her? (Don't know what happened to those cat-like reflexes.)

I took about a pound of chili everywhere, and I do mean everywhere. On my brand new (white) shoes, my shirt, my pants, my face, in my hair! I had chili on the floor, on the cat, on the cabinet doors, on the counter tops, on the walls, on the fridge. I even had chili on the ceiling!
(Who knew chili defies gravity?) I even had chili on my back! (How the hell can that happen?)

I'm still not sure where Becky (my wife) hid the explosive but I know there had to be one in that bowl to make chili go everywhere like it did.

Tigger (my other cat) began to help Puddin clean herself while I tried to keep that vein in my forehead (that was bulging out) from exploding. What a way to start the day!

After a few hours I do realize the humor in it and I can't even look at Puddin without almost pissing myself!

Hope you enjoyed!

[freakytiki4u]

Re: Envision G918w1

To say I felt anger and frustration doesnt even begin to describe how I felt when this happened. I was soooo angry that all I could do was stand there in complete silence for about 3 full minutes as I realized 2 things. 1. I didnt have a wide enough avenue to allow all the anger I was feeling to flow freely from within me. 2. I was home alone and I was going to have to clean all this chilli up by myself. LOL, its the fisrt time in my life that I was soooo ticked off, all I could do was just stand there and look around trying to figure out "what the heck just happened?" I couldnt even curse. LOL