Dell 1707fpt's transformer smells badly

[uligli]

I bought a few bad monitors two day ago, one of them is a Dell 1707fpt, it work fine except when it's on some bad smell come out, i find out the bad smell comes from one of the transformer, should i replace it?

[retiredcaps]

Re: Dell 1707fpt's transformer smells badly

I bought a few bad monitors two day ago, one of them is a Dell 1707fpt, it work fine except when it's on some bad smell come out, i find out the bad smell comes from one of the transformer, should i replace it?

I don't see a replacement part for your transformer at

http://lcdparts.net/T.aspx

but it looks like a replacement will cost around $20 USD. To me, it wouldn't be worth $20.

I don't know what the costs are in your country is, but sometimes (not very often) I see ads for used 19 inch LCD monitors for $20 CDN.

It looks like you recapped the board too with United Chemicon.

[uligli]

Re: Dell 1707fpt's transformer smells badly

No i did'nt recap it, i was surprised when i saw the logic board and inverter board full of UC caps. It's worth spending $20 reapairing this monitor to me. Thanks for the website

[Toasty]

Re: Dell 1707fpt's transformer smells badly

Does it get hotter than the other?
Could it be bad CCFL tube(s)?
Have you tried switching tube connections from one side to the other?

Whole board: http://www.lcdrepair.us/1707-1907FPt...ter-power.html

p/n: 6832165100P01 aka: PTB-1651
.

[uligli]

Re: Dell 1707fpt's transformer smells badly

Does it get hotter than the other?
Could it be bad CCFL tube(s)?
Have you tried switching tube connections from one side to the other?

Whole board: http://www.lcdrepair.us/1707-1907FPt...ter-power.html

p/n: 6832165100P01 aka: PTB-1651
.

I turn it on for 20 - 30 secs and works fine, i turn it off quickly after smell the bad odor, so i don't think it could be bad CCFL tubes.

[uligli]

Re: Dell 1707fpt's transformer smells badly

Updates (divided 3 parts)

update #1

I find out that the odor actually comes from a burned ccfl's female connector, there is a burned spot that's quite obviously, doh

[uligli]

Re: Dell 1707fpt's transformer smells badly

update #2

I took a connector from another board, not the exact same size so i bend the legs a little. After soldering it without any problem i turn on the monitor, the burned chemical odor was gone, but i still smell the chemical odor. I opened the monitor again and measured most of the surrounded components of that female connector:

c108 - 692 ohm
c109 - 429 ohm
c143 - no reading
R111 - 249 ohm (SMD resitor marked as 4320)
R112 - 994 ohm (1001)
R115 - 3.62k ohm (1598)
R120 - 12.96k ohm (1302)
all diodes read 616-622

I think may be the ceramic cap is bad (N27 3KV SEC), interesting that i notice a glowing cable in the back of the monitor.

[uligli]

Re: Dell 1707fpt's transformer smells badly

update #3

So i turned on the monitor without the backcover, and definitely the ccfl's cable attached to the bad connector was glowing purple blue, i tried connect to another side and still glowing, i guess the problem it's a leaking ccfl tube, am i right? Should i change the ceramic cap too?

P.S: the monitor doesn't have any brightness or display problem, completely functional, except for the smell.

[uligli]

Re: Dell 1707fpt's transformer smells badly

Toasty was right about the CCFL's tube

[Agent24]

Re: Dell 1707fpt's transformer smells badly

I don't know what would cause that wire to do that. Hope someone else can tell you!

[Quasar]

Re: Dell 1707fpt's transformer smells badly

Glow is corona effect on wire. High voltage. Are those wires going to the CCFL tubes? A bad tube might cause that as the HV has no where to go, no load.

[uligli]

Re: Dell 1707fpt's transformer smells badly

Glow is corona effect on wire. High voltage. Are those wires going to the CCFL tubes? A bad tube might cause that as the HV has no where to go, no load.

Yes, those wires going to the CCFL tubes.

[Quasar]

Re: Dell 1707fpt's transformer smells badly

Then replace the CCFL's and the connector and you should be fine.

[uligli]

Re: Dell 1707fpt's transformer smells badly

Should i replace the ceramic cap too?

[Quasar]

Re: Dell 1707fpt's transformer smells badly

Unless it is visibly failed, I have found them to generally be okay. I would not replace it. Maybe check it to be sure it is not shorted, but I think it will be fine.

[uligli]

Re: Dell 1707fpt's transformer smells badly

Thank you Quasar

[uligli]

Re: Dell 1707fpt's transformer smells badly

I opened the LCD panel and effectively a lamp was broken, put a pair of 1703fps ccfl's tubes (upper ones) which are very similar in size, trying to put to the panel all together took me an hour unfortunately i f' up the the lcd screen while assambling (pressure marks) at least it works but with faulty display.


Thanks to everyone who tried to help.

[Agent24]

Re: Dell 1707fpt's transformer smells badly

Could you take a photo of the pressure marks? I would be interested to know what they look like for future reference.

[uligli]

Re: Dell 1707fpt's transformer smells badly

Sorry i've been busy, didn't have time to take the pics. After few days of "resting" the defects on the screen have been changed (now visually is more acceptable than before).