Re: Dell E172fpb

Just run a solder iron over any joint in the heat affected area and if you have soldered before, you will quickly reaslise the cheap mix they used and from earlier posts, the solder always quickly parted from the pins which were dirty from the start of the manufacturing process.

Use your multimeter to watch if you have rise after the job to see if steady over 5 to 10 min before putting back together. again I mention the diode used as the test point, Cheers

Re: Dell E172fpb

Folks, see my earlier posts

If you have not spent 20min with a cheap solder sucker and resoldering the heat affected areas then the above symptons that sound like everything is working fine but the time working becomes less and less means the crappy solder and heat combination is dry jointing the board.

I'm up to seven repairs and this resolder is mandatory with no failures from daily use and the first experiment at page three is still in daily use by one happy son.

If I could tell you which dry joint then I would but...

Re: Dell E172fpb

Hi folks

As a matter of interest, I came back to have a peek at this site and a few more friends have joined to get their monitors working. Folks, I've had a chance to check out a second board and again a successful repair geting the old tip41c (don't flame me as I had a few lying around) and I must remind people that if you have a DVM on the large diode (see page three) and you see 10v and accelerating quickly up to 14 then you must follow the earlier advice and remove, check and even change the few filtering caps in as stated earlier in thread which...

Re: Dell E172fpb

Just suffered the same symptoms again like the rest of us, however, now fixed. I just resoldered the board!

It is not the design so much as manufacture as all the component legs appear to have not been cleaned and a quick test with an iron will tell you this with the original solder wanting to part with the legs and I found this accross the whole board. Copper tracks on PCB are not a problem but about 80% of the component legs are dirty and even with high silver content solder pouring in I had some difficulty getting a wet joint and this is the major...

Re: Dell E172fpb

Just to update, I just put in a set of 4 tip41C's as a test of a recommendation, they just fit in and after looking at the specs, if a member on the other site at page 1 can use 2sd1438's (which are very light duty) then a 41C shoud survive.

Well the backlights again fire up but the heat!!!! Phew, ouch, dropped some temporary sinks on and ran for about 15min, but the sinks were only little and thermal runaway is very noticeable.

Give these are cheap and easy trannies to just test with I could care if I destroyed a set. With a multi,...

Re: Dell E172fpb

Hi Folks

Yes, just another fellow with a dead power board. I too have spent a few hours going over and yes mine suffered a blow out at Q759 which damage its mate at 760, I've pulled all the caps off, blue and cans to find all the blue on spec but those 703 and 712 are sus also, as for the rest the board seems fine so its worth a look on the large cans as well. Hope this helps.

Mousie