Dell 1703fps 2 seonds to black

[smason]

I've always liked these monitors, we have a bunch at work, no failures in 5 years. Got this one from my usual supplier.
Looks pretty well made. Seperate inverter board.
Testing it, only 1 set of lamps come on, using my known-good test lamps, they still don't come on in the top connectors, my lamps, and the monitor's lamps work fine for 2 secs in the lower connectors.

I suspect a bad transformer, or maybe a transistor on the inverter.
Not sure how I'm going to get the hard potting material off of the secondary side of the transformer....

Better photos and some measurements tomorrow when there's some light.

[retiredcaps]

Re: Dell 1703fps 2 seonds to black

Before you scrape off that stuff, try testing U1/U3 or U4/U6 for shorts (which ever you call the top).

[smason]

Re: Dell 1703fps 2 seonds to black

Checked those, no shorts.
Some measurements:
On the good side, the primary of the transformer T1, 1.8 ohms and 4 rings on the ring tester. Between the 2 red-circled points (possibly across the secondary of the transformer?) 689 ohms, 4 rings.

On the bad side, the primary of the transformer T2 1.8 ohms, no rings (appears shorted on the ring tester) between the 2 red-circled points 1.9 Megohms. So, smells like a transformer problem to me. Will try to remove the "stuff" and de-solder it for more accurate testing.

[retiredcaps]

Re: Dell 1703fps 2 seonds to black

On the bad side, the primary of the transformer T2 1.8 ohms, no rings (appears shorted on the ring tester) between the 2 red-circled points 1.9 Megohms. So, smells like a transformer problem to me.

I agree. 1.9M ohm is high for the secondary.

What is the part number for the transformer?

[seanc]

Re: Dell 1703fps 2 seonds to black

I agree, the transformer.
I replaced the inverter on my 1703FP 5 years ago, still works today - shame I gave it a pressure mark.

I turned it on & off so many times with the 'two seconds to black' issue, that a hole burned in the side of the transformer. That's how I found the cause of my problem

[smason]

Re: Dell 1703fps 2 seonds to black

Looks like the part number is 0101NH06G
Haven't found anything but an entire board for $20.00 so far. More than the monitor is worth to me.

[sabre504]

Re: Dell 1703fps 2 seonds to black

Had this problem to but took an inverter transformer off a dell 172
difference being that these are thro hole and the 1703 uses surface mount
but trimmed right they do fit but a deft bit of soldering required unless you are lucky enough to have a hot air station
not the prettiest of jobs but works the only real greif is removing the black glue from the transformer (hard as concrete)

[alexanna]

Re: Dell 1703fps 2 seonds to black

That ‘GrayStuff' almost reminds me of a JB Weld type of product.
Wonder if a Dremel tool would work, to get down to the pins without damaging the pads?

[seanc]

Re: Dell 1703fps 2 seonds to black

The entire board for $20 is a good deal compared to what I paid for mine 5 years ago!

[smason]

Re: Dell 1703fps 2 seonds to black

The entire board for $20 is a good deal compared to what I paid for mine 5 years ago!

Yes, but the monitor would have been worth it 5 years ago.

I'll shelve it for now and keep an eye out for a similar transformer on a "donor" monitor.