Dell E153FPB Back Light problem

[PlainBill]

Re: Dell E153FPB Back Light problem

ok will do, the picture is attached of the Inverter Board.

Great picture!! I've marked it up. The four transistors circled in red should be checked with an ohmmeter. We are looking for differences between one pair and the other.

Also, two transformers were circled in blue. Resolder the leads on all of them.

PlainBill

[freakytiki4u]

Re: Dell E153FPB Back Light problem

ok will do, the picture is attached of the Inverter Board.

[PlainBill]

Re: Dell E153FPB Back Light problem

I justy replaced the Pico Fuse again and its working again. What would cause the Pico Fuse to keep burning out? Please be very descriptive about location and part description as Im just a beginner board level repair newbie.

Probably a leaky transistor. Provide GOOD pictures of the inverter board and we can identify twhat to test.

PlainBill

[freakytiki4u]

Re: Dell E153FPB Back Light problem

I justy replaced the Pico Fuse again and its working again. What would cause the Pico Fuse to keep burning out? Please be very descriptive about location and part description as Im just a beginner board level repair newbie.

[freakytiki4u]

Re: Dell E153FPB Back Light problem

I replaced the PF751 Pico Fuse and the monitor worked for a solid week. Now it just blinks on and off repeatedly.

[EGuevarae]

Re: Dell E153FPB Back Light problem

The Flat Panel I fixed has stopped working again. Now it just blinks on and off. Any ideas anyone? I was so excited to have it working.

What did you replace in the unit (and with what)?

[freakytiki4u]

Re: Dell E153FPB Back Light problem

The Flat Panel I fixed has stopped working again. Now it just blinks on and off. Any ideas anyone? I was so excited to have it working.

[freakytiki4u]

Re: Dell E153FPB Back Light problem

Update.......I ordered the wrong type of fuse . What I ordered were not axial (no legs) they were just square as if they were meant to be popped in. They were the correct voltage and amperage so I decided to solder some legs on and put it in. It works perfectly! I have thrown out sooooo many flat panels with bad inverters that I most likely could have fixed /sigh
Thank you guys so much for this thread.

[freakytiki4u]

Re: Dell E153FPB Back Light problem

Wow, very fast reply from a few of you. I like this forum! Thank you very much. I actually just got off the phone with Digikey and have ordered what I need. Ill post if it works when I receive the parts. You guys rawk! I repair computers for a living and dable in electronics repair so if you ever need anything just ask.

[PlainBill]

Re: Dell E153FPB Back Light problem

Where can these Mini Pico Fuses be purchased?

Mouser, Digikey both carry them.

PlainBill

[freakytiki4u]

Re: Dell E153FPB Back Light problem

Yet another PF751 bad. Monitor has been on now for 3 hours with no problem. Thank you for you follow up Brianh. Jacob

Where can these Mini Pico Fuses be purchased?

[simpyborgs]

Re: Dell E153FPB Back Light problem

Mr Brianh...... i ask how thin is the wire you jumpered in replace with the MS 2A? or what other devices i can replace with that device? can i replace it ordinary fuse?with 2A on its spec?

[Bobdee]

Re: Dell E153FPB Back Light problem

Hi Guys! I own Dell E153FPB and it has backlight problem. It works for a few secs and than the backlights turn off. The pictuire is there but no backlight. I did change pf751 and resoldered the transformers' contacts and it worked for about 20 mins (I tought it was fixed) and now it is just the same. I know it's easier to trow it in a trash but I spent so much time on research on this s##t...It was said that the problem might be the SG6841S High-integrated Green-mode PWM Controller but before I buy it I wanna know what you suggest. Help...Help...Plz.
Thanks.

Check out the 4 transistors on Inverter = Q739, Q740, Q759, Q760
You are looking for shorts between the pins, if they check out okay then check there solder joints to board of the transistors with about a 10X magnifying glass looking for ring crack or any bad solder joint to resolder
Do the same to the 2 mosfets as well Q743, Q759
also check the rest of the board for ring cracks or bad solder joints, Benq boards always have bad solder joints

[Bubii]

Re: Dell E153FPB Back Light problem

Hi Guys! I own Dell E153FPB and it has backlight problem. It works for a few secs and than the backlights turn off. The pictuire is there but no backlight. I did change pf751 and resoldered the transformers' contacts and it worked for about 20 mins (I tought it was fixed) and now it is just the same. I know it's easier to trow it in a trash but I spent so much time on research on this s##t...It was said that the problem might be the SG6841S High-integrated Green-mode PWM Controller but before I buy it I wanna know what you suggest. Help...Help...Plz.
Thanks.

[Nama]

Re: Dell E153FPB Back Light problem

Yet another PF751 bad. Monitor has been on now for 3 hours with no problem. Thank you for you follow up Brianh. Jacob

[Bobdee]

Re: Dell E153FPB Back Light problem

hii bobdee ...thanx 4 ur support tatz by wrong i mention ter circuit tatz actuallyn u 850.near to that SMT on power section .itz a 8 leged ic.

Hello again
Your part number is SG6841S, Its a PWM controller,
A link to part may help,
http://cgi.ebay.co.uk/SG6841S-High-i...3286.m63.l1177

bob

you might want to check that mosfet and resistor by there, mine were gone

[choodan007]

Re: Dell E153FPB Back Light problem

hii bobdee ...thanx 4 ur support tatz by wrong i mention ter circuit tatz actuallyn u 850.near to that SMT on power section .itz a 8 leged ic.

[Bobdee]

Re: Dell E153FPB Back Light problem

Hello choodan0007
I have the new version E153fpf board
(inverter/power suppy/video all on one board) in front of me, cant see a u580.

If you have old version, is the part on the video board, if so post board number of that board, also picture if you can that may help in cross reference,this may help you,
there are a few good pics of old inverter/powe supply on badcaps
bob

[choodan007]

Re: Dell E153FPB Back Light problem

HII somebody help me .i hav a dell E153FPf monitor itz one ic got burned i cant read that ic noumber also ,itz circuit noumber u580......plsss post that ic noumber if any one having that

[MegaOne302]

Re: Dell E153FPB Back Light problem

I found an E153FPB last weekend on my way home, but when I plugged it in, it was DOA. After opening it up and checking things like the caps and fuses I couldn't find the problem. I totally past up fuse PF751 because in didn't look like a fuse; this was the first time seeing this type. The P in front means that it's a mini Pico Fuse. So Yep that was all, a bad Pico fuse PF751... I just dropped in a 2A Slow Blow from my parts box and boom, she's back to life.
And may I ask why you put in a 3A? If the fuse blows, that's a good thing; it means it just saved the circuitry from frying or from burning down your house. So please tell me why you think it's ok to override a safety measure?

Here's a thinker for you.

If a fuse/breaker blows in your house, do you say hey, it was only a 20amp? I'm going to put a 30amp in so that never happens again… ?

Thank god Spring ‘s coming. lol

Thanks all,

Joe