Dell 1704FPT

[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

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

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.

[Rtech]

Re: Dell 1704FPT

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

[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

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

PS youre only up the road from me!

[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.

[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

Hi guys,

bit of a STUPID question (but then my Dad always told me there are no stupid questions....only stupid people!)

I have a DELL 1704 with a cracked CCL and burnt R125, I have just purchased a replacement LCD and I understand from the posts here that I need to replace the R125 with a 2000000 (2 megohm) resistor, but what wattage should I use? also where would be best place in UK to purchase?

THANKS!!

[UniT3d]

Re: Dell 1704FPT

Excuse me guys,

I have this exact board on a dell 1704fpt with R125 resistor bands unrecognizable (burnt and took the track off with it). Can anyone be so kind as to state either the correct value or colors please? It reads 130kOhms on the meter but I don't know if this is correct. The resistor is the only thing left to replace before I fire this lcd up ...

Added:
Whoops ... got it ... R125 is Red Black Green Gold .... powered up and voila, it works ....


Thanks.

[retiredcaps]

Re: Dell 1704FPT

all having this exact same problem.

1) What is "this exact same problem"?

2) If you have 11 of these and would like help, please post clear focused pictures using the manage attachments function of your boards (top down view). We don't need pictures of all 11, just 1 of the lcds will be fine. Please do not post inline.

3) Do you have a multimeter?

[cidi1484]

Re: Dell 1704FPT

Oh boy - I had 11 monitors dumped on me today all having this exact same problem. Please tell me someone has tracked down the root of the issue? Otherwise I will be buried for some time trying to figure it out.

I also have a few that wont even power on. Since I dont usually fix this brand (since Dell usually covered it) does anyone have any quick hitters for dells that wont power on?

Thanks for your help in advance!

[Lumberjack777]

Re: Dell 1704FPT

Hi all

Has anyone had any problems with the resistor at location R125 blowing out. I was given to monitors and both have the same resistor blown out. If you know this resistor and a direct link to where I can buy them Please let me know. You can Email me At Clvnmorgan836@gmail.com...Thanks

Same here! I just need to confirm the color bands on R125 (mine was burnt beyond recognition). Is it red, black, blue and gold...or is that red, black, green and gold?

I bought this same Dell 1704FPT at an electronics recycling shop for 5 bucks. The first thing I noticed was the resistor at R125 was almost fried. It still tested to be good. But it had fried so much the copper track had partially come off. I soldered a bridge, but it still didn't fire up. So I ordered a new power/inverter board and it did work. For about 6 hours. Then the backlights went off again. Upon inspection I noticed the same heat brown spots at R125. This resistor and board were fine before I installed it and plugged it in.

So my question is. What causes that resistor at R125 to fry in so many boards? Is this a design issue? Or maybe a bad CCFL? Can a bad CCFL do this? You can look at Plain Bill's picture to see the problem we are dealing with. It's labeled RF in red in his picture.

The company has sent me a new board (for free) and I think I better resolve this issue before I plug in the new board. I don't want this one to fry too.

Thank you

[retiredcaps]

Re: Dell 1704FPT

I may try buying a new board that I've seen for $30 on the net.

I don't know where you live, but I can get an used 19 inch LCD monitor for $20 if I'm patient. I can easily get an used 17 inch LCD monitor for $30 almost anytime.

$30 for a new board seems like a lot.

[captainmorgan04]

Re: Dell 1704FPT

Same here! I just need to confirm the color bands on R125 (mine was burnt beyond recognition). Is it red, black, blue and gold...or is that red, black, green and gold?

Red is 2 Black is 0 green is 5 (0's) and gold is +-5%

2000000 ohm

I'm taking Automotive electronics this semester and that is what the book values are.Hope this helps cause I took one out of the other monitor to try and the backlight comes on but goes back off. All caps look good. What ever burned up the resistor must have done other damage that I can't see. I may try buying a new board that I've seen for $30 on the net. Good Luck.

[jkleslie]

Re: Dell 1704FPT

Hi all

Has anyone had any problems with the resistor at location R125 blowing out. I was given to monitors and both have the same resistor blown out. If you know this resistor and a direct link to where I can buy them Please let me know. You can Email me At Clvnmorgan836@gmail.com...Thanks

Same here! I just need to confirm the color bands on R125 (mine was burnt beyond recognition). Is it red, black, blue and gold...or is that red, black, green and gold?

[captainmorgan04]

Re: Dell 1704FPT

Hi all

Has anyone had any problems with the resistor at location R125 blowing out. I was given to monitors and both have the same resistor blown out. If you know this resistor and a direct link to where I can buy them Please let me know. You can Email me At Clvnmorgan836@gmail.com...Thanks

[dalbrech]

Re: Dell 1704FPT

Jonny800,

Did you ever resolve the problem with you Dell 1704FPT monitor? The reason I ask is I have the same monitor with the same problem. I was planning on replacing the inverter/power board but now it seems the problem could also be a bad lamp?

Thanks,

Dave Albrecht

[PlainBill]

Re: Dell 1704FPT

Ok PlainBill I did the test and have the results for you. Also to note when I turned on the monitor the LCD lit up and stayed on but was flickering.

A = 457
B = 454

Also my DMMs lowest AC voltage range is 200. R1 and R3 were jumping all over the place.

CF = 0.4
RF = 0.1
R1 = 98.9 to 10.6
R2 = 0
R3 = 8.5 to 9.6
R4 = 0

Do you need me to get a DMM with a lower AC voltage range or will that information work?

Thanks for your help.

That information helps, but still leaves me with questions.

The resistances indicate there is no transformer problem. I'm not sure about CF and RF readings, I don't have a lot of experience with this design.

I assume R1 was 9.9 to 10.6, not 98.9?

The fact that TWO return lines were 0 doesn't make a lot of sense. One would indicate either a bad CCFL, or a shorted diode. Two of them???

I'm going to have to think about this. PM me if I haven't updated this by 2-09.

PlainBill