LG Flatron 1953t-BF 2 seconds to black

[SePhIrOtx]

Hi I'm new on this forum. To be honest, I'm new about fixing LCD monitors. I got a deal on 5 LCDs who's got the same problems. I can see the LG logo for about 1 second and the other second I can see my computer screen. With the flashlight trick I know this is the backlight. I changed all of the capacitors except the 470uf. The problems is the same. I only touched to one because I'm a noob with soldering. I got some pics for you. English is not my first language, I'm french. I'm here to learn from the best. I have a multimeter. Here's the pictures. The backlight does make a sound when I power on my monitor and a smell too. The monitor power is still on but the backlight flash two times before shut off.

Thanks

[selldoor]

Re: LG Flatron 1953t-BF 2 seconds to black

We like pictures of the whole board straight on back and front
Also post close up ff the back of the board where the inverter transformer is
(The oblong one with the yellow stripe round - also advise any part numbers on it.

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

Try my backlight on my second LG and its the same thing but its not the backlight who's making the sound but one big electronic thing. Will post the photos. It has Qc OK marked on it. 4 backlight is doing the same thing.

I post this thread in the wrong section...

Pics was the second screen.

[selldoor]

Re: LG Flatron 1953t-BF 2 seconds to black

Please only deal with one set at a time - you can do what you want to the others but dont mention them on here until this is finished.

You are in the correct forum.

See attached - NO power to boards - set your meter on ohms 2000 and test S1 to S2 and S3 to S4 and post results

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

Please only deal with one set at a time - you can do what you want to the others but dont mention them on here until this is finished.

You are in the correct forum.

See attached - NO power to boards - set your meter on ohms 2000 and test S1 to S2 and S3 to S4 and post results

Sorry but I'm really noob about this but what do you mean by S1 to S2? Where's can I find them.

[Davi.p]

Re: LG Flatron 1953t-BF 2 seconds to black

Hi sephir, you much probably have to buy new lamps, i see in the picture darkened ends in one side, just to be sure try to make a close up picture of each end of the 2 sets of 2 lamps (4 lamps in total) maybe not all the couple is bad..

[budm]

Re: LG Flatron 1953t-BF 2 seconds to black

"The backlight does make a sound when I power on my monitor and a smell too" You should gently tug on the wires to see if they will come off the end of the lamp, you probably smell an Ozone. Those lamps do not look good.
http://s807.photobucket.com/user/bud...ml?sort=3&o=13

http://s807.photobucket.com/user/bud...?sort=3&page=1

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

Hi sephir, you much probably have to buy new lamps, i see in the picture darkened ends in one side, just to be sure try to make a close up picture of each end of the 2 sets of 2 lamps (4 lamps in total) maybe not all the couple is bad..

Heres the close up pictures

"The backlight does make a sound when I power on my monitor and a smell too" You should gently tug on the wires to see if they will come off the end of the lamp, you probably smell an Ozone. Those lamps do not look good.
http://s807.photobucket.com/user/bud...ml?sort=3&o=13

http://s807.photobucket.com/user/bud...?sort=3&page=1

Will try to disasemble these to see if its a bad connection. For the moment, its aint look good?

[Davi.p]

Re: LG Flatron 1953t-BF 2 seconds to black

Change them all...

[selldoor]

Re: LG Flatron 1953t-BF 2 seconds to black

Sorry but I'm really noob about this but what do you mean by S1 to S2? Where's can I find them.

Sorry - its me at fault- forgot to attach the picture oh:

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

Change them all...

Dammit. Its not a good start ^^

[Davi.p]

Re: LG Flatron 1953t-BF 2 seconds to black

In italy them costs approx 6 dollars each + shipping whitout cables, you must solder on the old cables. it's a 1-2 hours work depend..

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

In italy them costs approx 6 dollars each + shipping whitout cables, you must solder on the old cables. it's a 1-2 hours work depend..

6 dollars each but 4 per screens, 24$ without shipping. That's expansive to fix some 19 inch ^^

If I found them much cheaper why not

[Davi.p]

Re: LG Flatron 1953t-BF 2 seconds to black

I don't know the dollar change ,in euros are 5 per lamp, and think that a new monitor costs 80-85 euros..

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

Sorry - its me at fault- forgot to attach the picture oh:

Tested. Here's it is.

S1-S2 = 994
S3-S4 = 997

[Davi.p]

Re: LG Flatron 1953t-BF 2 seconds to black

The transformers are good but the fault is clear like sun.. the lamps.

[Jooo]

Re: LG Flatron 1953t-BF 2 seconds to black

I don't know the dollar change ,in euros are 5 per lamp, and think that a new monitor costs 80-85 euros..

Magic word: new... Used 19" 4:3 monitors aren't worth much. I'm struggling to sell monitors like this for 30 euros. Usually it is around 20 - 25 euros what I can get for a scratchless 19" 4:3 monitors with DVI.

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

Magic word: new... Used 19" 4:3 monitors aren't worth much. I'm struggling to sell monitors like this for 30 euros. Usually it is around 20 - 25 euros what I can get for a scratchless 19" 4:3 monitors with DVI.

That's why I dont want to put tons of money to repair them. I got 5 of them, maybe some backlights are ok and I'll be able to get a cheap surround for testing.

[Davi.p]

Re: LG Flatron 1953t-BF 2 seconds to black

If he prefers can get an used one yes...
"I'm struggling to sell monitors like this for 30 "
Yes i'm doing too, but the world is not right with theese things.. i think..
The cost can be 27 incl. shipping, and you have new lamps, if you get an used monitor
you get used lamps and dirt from unknowns, if you get a new monitor you spend over twice
i repeat...

[SePhIrOtx]

Re: LG Flatron 1953t-BF 2 seconds to black

If he prefers can get an used one yes...
"I'm struggling to sell monitors like this for 30 "
Yes i'm doing too, but the world is not right with theese things.. i think..
The cost can be 27 incl. shipping, and you have new lamps, if you get an used monitor
you get used lamps and dirt from unknowns, if you get a new monitor you spend over twice
i repeat...

Yeah you're right about the cost of buying a new screen but I already got an 23 inch who work like a charm. Wanted to repair the 5 19inch to try a cheap surround before going for two another 23 inch. Got these for really cheap.