Re: Dell E172fpb

The monitor that i had fixed with the help of this forum has once again failed... this time, the monitor works for around 2 hours, then goes off with the original symptom.

If it's left off for a while, it can be used again for about 2 hours (presumably some sort of thermal problem)

I haven't had a chance to look at it again yet, but will let you know how i get on.

Re: Dell E172fpb

Thanks all for your help...

I tested the transistors Q759 and Q760 were shorted, I have swapped these, and the monitor now works great!

Once again, Thanks to all who helped!

Re: Dell E172fpb

Ok, on my board, the blue caps are brand new (maybe still crap, limited stockists nearby and not enough time to order over the net), labeled C751, C703, C712 C709, C707, C708 and C710.

D701 and D702 are UGF10DCT Diodes (with sinks).

Thanks for the link willawake... Looking at that, it looks like the same problem I have, so, does anyone know of a stockist in the UK that has some 2SC5707's (Edit: or equiv) (in lower quantities than 700)? Quick google didn't reveal much...

Thanks for all the help!

Re: Dell E172fpb

Symptoms...

If the monitor is connected to a PC (in windows or whatever), when you first power it up, you get a very quick flash of the windows desktop on the display. The power LED then starts flashing at a rate of around 1 flash per second.

I have taken voltage readings at CN701... Pins 9 & 10 pulse 3.3V, but as i'm using a Digital VM, it seems to fluctuate between 1.5 and 3.3V. Pins 7 & 8 pulse between approx 2 and 5.0V. Pins 3 - 6 are GND.

If you listen closely to the board, you can hear a "tick"...

Re: Dell E172fpb

I have the same monitor for repair, pics as requested...

Regards

Richard...