The Dreaded Dell monitor problem..

[Bill_Pine]

Hello, dont know if any of you guys can help but I have a Dell E151FPP LCD monitor problem I think its quite a common fault, power light on but no screen..... Being a mature first year electronics students I only know the basics and so far have only checked out the lamps which tested OK.What esle could cause this problem............ Anyone?

Thanks

[Bill_Pine]

Re: The Dreaded Dell monitor problem..

Maybe the FCH20A15 or P6NC60FP would cause a dead screen?

[Krankshaft]

Re: The Dreaded Dell monitor problem..

Check the inverter driver transistors they will have the number C5707 on them. They will be in the same vicinity as the high voltage transformers (where the backlights plug in).

Just test them like any other transistor with the diode checker function of your DMM one of them will be shorted.

Replace them in pairs or better yet replace all four.

[CudaDave70]

Re: The Dreaded Dell monitor problem..

I have a Dell E173FPb I am messing with the similar,momentary flash of the backlights then the blinking green led behind the power button. I got as far as checking the output voltage right after the bridge rectifier (BD601 ) and I get 160 volts DC. I am very new to this and pretty rough around the edges but very willing to listen to some pros for some tips .
It appears to me there is no voltage getting to the main transformer (T601 ) No heat anywhere on the board,no signs of any bad caps, no dark spots or carbon traces on the pcb. I have read all about the defective transistors on the inverter side of the board,is there any way this 160 volts is correct ,I understand about the 120 volts AC goes through the two diodes of the bridge rectifier and changes it to DC but don't understand the voltage rise right at the + - leads of the BD 601. Can someone lead me down the correct path?

[kc8adu]

Re: The Dreaded Dell monitor problem..

sounds like it started up .
shine a flashlight into the screen with power on.
you may see the test box moving around.
if so its a ccfl inverter problem.

[satfta1]

Re: The Dreaded Dell monitor problem..

when you say no screen , do you mean dark screen , or lies up white w/no data

[Bobdee]

Re: The Dreaded Dell monitor problem..

Hello, dont know if any of you guys can help but I have a Dell E151FPP LCD monitor problem I think its quite a common fault, power light on but no screen..... Being a mature first year electronics students I only know the basics and so far have only checked out the lamps which tested OK.What esle could cause this problem............ Anyone?

Thanks

Hello i might have a fix for this one, i believe you have the same inverter as me, a Ambit T501028.00 REV2. with mine its a tiny smd 2A fuse found by connector, marked ''F1'' my monitor is Compaq TFT5015 model No PE1212 , havent fixed mine because i dont know if its slow, fast, or resettable ect and where to get one, any one out there who can help please do im desperate.
as for more info see Baadcaps thread by batmab456br titled

Re DELL LCDE151FPp - black screen problem solved.

hope someone can help me with identifying this fuse please post or E mail me or send private message
hope this helps
bobdee

[RJARRRPCGP]

Re: The Dreaded Dell monitor problem..

Are you sure that the PC isn't failing to boot?

Did you test another monitor? Sorry for asking.

[Krankshaft]

Re: The Dreaded Dell monitor problem..

Hello i might have a fix for this one, i believe you have the same inverter as me, a Ambit T501028.00 REV2. with mine its a tiny smd 2A fuse found by connector, marked ''F1'' my monitor is Compaq TFT5015 model No PE1212 , havent fixed mine because i dont know if its slow, fast, or resettable ect and where to get one, any one out there who can help please do im desperate.

Fuses usually don't blow out without a cause for a temporary fix to see if the fuse is shot get a cheap fuse holder and a 2 amp glass fuse and solder wires to the fuse holder then solder those wires where the old fuse was.

If that is indeed your problem and the monitor works then you will need to measure the part with a digital caliper preferably. Its length and width and go to one of these sites.

newark.com

digikey.com

mouser.com

They should have the SMD fuse you require. But you will need to look at the datasheets of the SMD component to make sure that they're the right size. If you can't find the exact size than at least make sure that the fuse isn't longer then the solder pads on the board.

Finding SMT parts can be a chore but after you've done it a few times it gets easier.

[Bobdee]

Re: The Dreaded Dell monitor problem..

Hello Krankshaft
Thanks for your reply, very helpful have carried out your suggestion, and monitor is up and running i have put it through its paces by turning it on and off and also entered into and out of sleep mode several times and all is still well.
I used 20mm 2A 250V glass quick blow, i suspect that i may have a problem later on because as you said fuses dont blow for no reason, i take it that i now buy a smd 2A fast fuse ?, by the way the fuse size is 3mm x 1.5mm x 2mm high, aprox with a spare 1mm of solder pad each end, i did not have access to a caliper, it was brown, and on the top was 2 A and under the 2 was something like a drawing of the eiffel tower and under the A was the number 24
Can you answer another questions for me please.
With the fuse blowing on inverter is the problem more likely to be there or before the fuse on the power board ?.
By the way i did not remove old dead fuse, i soldered one wire to cap on solder side of board that fuse went to and the other onto uncoated track to conector from fuse on component side of board as this seemed easier for me due to my inexperience at this type of thing, it seemed too tough for me to remove fuse and solder wires onto small track near to other tracks.
I will be checking solder joints with magnifying glass and caps with ESR meter that i am buying soon also had a good idea that i would remove the old fuse and bridge across pads with solder and remove a bit of the uncoated track to open, and bridge with new fuse as there is more room for me to work in
long winded again, sorry
appreciated your post very much, many thanks.
bobdee

[Krankshaft]

Re: The Dreaded Dell monitor problem..

Actually from reading other posts changing out the fuse did put these monitors back in operation.

It could be some sort of fluky current surge like the one on the soft start circuit that blows the C5707s on some other Dell monitors.

That fuse probably protects the input to the inverter circuit the only way it could have blew is the inverter drew more than the rated 2 amps the fuse could carry. Fuses protect against overcurrent.

On a permanent basis you could leave that fuse there as long as it's installed so that it won't contact the metal enclousure or any other parts on the inverter board. It won't be pretty but if you don't have SMT soldering experience to remove the old fuse it's much better than ripping a trace.

If you used a fuse holder in your test to make the mounting more permenent they do make axial fuses. These are basically glass fuses with solderable leads coming out of each end.

Like this:



A nice little one like that would also make it easier to cram into the inverter without shorting stuff out.

Sorry for the long wait for the reply.

I'm working on my car's cooling system and flushing out about 5 years worth of rust from the radiator .

I take way better care of my electronics than my transportation .

[Krankshaft]

Re: The Dreaded Dell monitor problem..

A axial picofuse would be even better and easier to insulate.

Like this:



They're pretty small but still as easy to work with as any other through hole component.

Here is one from Digikey at 2 amps and a fast blow:

http://search.digikey.com/scripts/Dk...?name=F2331-ND

Here is a standard glass one in your amperage and blow as pictured in my prior post:

http://search.digikey.com/scripts/Dk...?name=F2437-ND

Good luck.

[Bobdee]

Re: The Dreaded Dell monitor problem..

Thanks Krankshaft
For your time and patience and info, thanks Badcaps also, you have been a great help to me, i had a bit more luck, i saved another monitor from landfill today and lo and behold its a Dell E151FPp and as mine is a Compaq with the same inverter , as the dreaded dell as informed in thread by batman456br, which is the Ambit 501028.00 REV 2,
i opened up this new monitor with expectations that i would find a ambit inverter, but surprise surprise this ones got a Delta inverter , the problem with this monitor by the way is the same as my compaq was, a black screen with green light staying on but screen displays in background, quick look at delta inverter and there it was , this troublesome little fuse, identical to the one in the ambit inverter, and dead as a Dodo to go with it, the inverters are completly diffrent obviously, but the power boards are diffrent but resemble each other, i think they are the same manufacturers but not sure, i rigged this one with temporary fuse and its up and running with the compaq at this moment, could this be a ropey short life fuse i ask ? thought you might be interested, i will make a note of p/board makers and there numbersa when i open them back up to do permanant repair if anyone is interested to know them.
As for the info you posted me, i might have a go at the smd fuse especially on the delta its more out in the open, i must learn sometime, if i run into trouble i will fall back on the pico fuse, i am sure i can safely insulate that one, it will fit and look better.
Hope your work on your car went well,risky leaving it that long.
I will let you know how i get on, it will take me some time getting parts as usual, will update when done.
Much appreciated,thanks again.
Bobdee

[johnboy183]

Re: The Dreaded Dell monitor problem..

If any one is still having this problem I found a simpler solution that seems to work to replace the 2 amp fuse. On some earlier work on Playstation 2s I was left with a couple of duff boards and lo and behold they have several surface mounted 2amp fuses almost the exact size of the one on this inverter. I detached one of those and re-soldered it in the place of the failed one and up came the display. Have now done this on two boards and it seems to work. Not sure about the longer term but cant be any worse than soldering of some of the fuses suggested so far.
Johnboy183

[FIXITNOW]

Re: The Dreaded Dell monitor problem..

have been using fuses from ps 1's for a while as lots of one with duff laser going free via freecycle or simular places

[blinkdt]

Re: The Dreaded Dell monitor problem..

Folks, I'm in over my head a bit here and could sure use an assist. I just got my hands on a PS one and am looking at the board, but I have no testing equipment and am not an electronics pro by any means. I am handy with a soldering iron and persistent, however , so if anyone can help me identify the component in question (2A fuse as described by Bobdee in his 10-02-08 post) on this board I would sure appreciate it. Something like "the larger grey rectangular thingy south of Q602 and northeast of C317" would put me straight, I think. Thanks in advance for any help.

[FIXITNOW]

Re: The Dreaded Dell monitor problem..

PS601= 1 Amp-You have a picture but it goes to the audio menu. Also the laser does not spin and the game will not boot.

PS602= 1 Amp-You will not notice any change if this fuse goes bad. The purpose of this fuse is to provide protection for the supply line to the serial connector at the back of your playstation. Also this fuse is not used in European versions.

PS603= 1 Amp-You will not get any picture, you will only see a snowy pattern of horizontal parallel lines on the screen and the laser wont spin.

PS604= 2.3 Amp-You will have a blank screen and the laser wont spin.

PS605= 0.7 Amp-Your joy pad will not operate.

[blinkdt]

Re: The Dreaded Dell monitor problem..

Nice, FIXITNOW, very nice. A picture is always worth a thousand words .But are you suggesting that I can use any of these to replace the faulty 2 Amp fuse on the inverter board for the Dell moniter model E151FPp?

[FIXITNOW]

Re: The Dreaded Dell monitor problem..

The ones marked 20 are 2 amp the ones marked 15 are 1.5 amp
use the ones marked 20

[johnboy183]

Re: The Dreaded Dell monitor problem..

If you scavenge from a PS2 board for these fuses there are lots of photos on the net showing the board with the fuses identified and their amperage. probably that is true of PS1 boards also.