Dell 1704FPT

[Rtech]

Re: Dell 1704FPT

Suggest you try a local Maplins if possible.....trying to buy by post will not be economically viable.

[ralphup]

Re: Dell 1704FPT

Suggest you try a local Maplins if possible.....trying to buy by post will not be economically viable.

thanks been search the NET all day, maplins dont do a 2MOhm so think its going to have to be 2 x 1 MOhm - unless you ca think of another option Rtech.

[ralphup]

Re: Dell 1704FPT

PS youre only up the road from me!

[Rtech]

Re: Dell 1704FPT

As you are in Leeds, then go to Farnells !! Obviously no postage as it would be an over the Counter purchase, and I don't think there is a minimum order when you collect.

[ralphup]

Re: Dell 1704FPT

As you are in Leeds, then go to Farnells !! Obviously no postage as it would be an over the Counter purchase, and I don't think there is a minimum order when you collect.

Hi mate,

got 2 x 1MOhm and fittedm but no joy still dies after a few secs.

This is with a NEW screen asthe old one had a broken CCL. I know its the PTB-1511 board as I have a couple of these and substituted for a good one. Any ideas what else could have died?

Thanks for all help!

[Rtech]

Re: Dell 1704FPT

I think some pictures of top and bottom may be helpful.Use the 'managed attachments' to put them on.

[Rtech]

Re: Dell 1704FPT

Have just checked the faulty board I have,and that has the same symptoms as your has,BUT the fault is an open secondary on the Inverter Transformer T101,and am still waiting to find one,they should read approx 450 ohms.Also my R125 and the similar one on the other transformer is 2.2Mohms.

[ralphup]

Re: Dell 1704FPT

Have just checked the faulty board I have,and that has the same symptoms as your has,BUT the fault is an open secondary on the Inverter Transformer T101,and am still waiting to find one,they should read approx 450 ohms.Also my R125 and the similar one on the other transformer is 2.2Mohms.

Thinking of buying a replacement PCB from EBAY:
Item number: 140512299224

If and when I do you can gladly have my faulty board for parts...

[Rtech]

Re: Dell 1704FPT

Thinking of buying a replacement PCB from EBAY:
Item number: 140512299224

If and when I do you can gladly have my faulty board for parts...

Many thanks

[ralphup]

Re: Dell 1704FPT

Many thanks

Hello there, I have sent you a PM and await your response sir!

[pcarbery]

Re: Dell 1704FPT

Hi there all,

I know this is an old discussion, but it is the best I have found; and hope some of you might be able to help.
I am wondering if anyone has resolved this issue. I too have one of these Dell monitors that displays a screen for less than a second before going blank. I too have noticed a burnt R125 resistor (but still seems intact). I was thinking of replacing the inverter board but am reluctant to, if it is just going to fail again.

I suspect from reading other forums that one of the lights may be gone and that the board automatically shuts down all others once it senses this....perhaps this is why the R125 resistor is overheating.

Any help? ideas?

[Rtech]

Re: Dell 1704FPT

It may be the transformer that has failed ?? have you checked the Resistance of the secondaries ??

[pcarbery]

Re: Dell 1704FPT

hi Rtech, sorry for the late reply but couldnt get back to this project until now. Resistances of the secondaries are fine. A = 459 , B=434. all cap's look ok, no signs of any problems......will check them with DMM when I get a different one that can check farads. (I think I have one in work somewhere).
By the way, I can see the screen when I shine a flashlight on to it.

[Rtech]

Re: Dell 1704FPT

hi Rtech, sorry for the late reply but couldnt get back to this project until now. Resistances of the secondaries are fine. A = 459 , B=434. all cap's look ok, no signs of any problems......will check them with DMM when I get a different one that can check farads. (I think I have one in work somewhere).
By the way, I can see the screen when I shine a flashlight on to it.

If you can see the image,,then definitely a Backlight issue.

[pcarbery]

Re: Dell 1704FPT

Thanks Rtech, does you reply mean that it is one of the lights or could it still be the inverter board?

[budm]

Re: Dell 1704FPT

Try test lamp?
https://www.badcaps.net/forum/showthread.php?t=19987

[Rtech]

Re: Dell 1704FPT

Could still be either !! you really need a test Backlight to identify where it is.

[pcarbery]

Re: Dell 1704FPT

thanks guys for the replies.....will test lamp and reply back in a few days

[budm]

Re: Dell 1704FPT

You can get one of these for testing your lamps:
http://www.ebay.com/itm/1pc-4-Lamp-B...ht_3916wt_1400

http://www.ebay.com/itm/LCD-Monitor-...ht_1794wt_1400

[pcarbery]

Re: Dell 1704FPT

Things happen slowly in my country....anyway, I finally fixed the monitor and am looking at it right now. In the end, I purchased a new inverter board on ebay for 20 bucks. I couldn't locate any bad caps (but are sure there were some) I took a chance that the lights were ok and went ahead with the purchase. I will post again if there is any problem with it. So far so good, but it has only been switched on for 1 hour.
Thanks for all the help everyone.