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You say you looked at the transformer leads, but did you actually resolder them?
Also, try reseating all the connectors. Also check the tuning caps 0. Please post the pictures of the board. Service manual for 17 3 FP – maybe same? Questions via PM will not be answered.
Post on the forums instead! I re-soldered all the leads on the solder side even though they looked fine. Given that, I also re-flowed all the leads on the transformers where the windings terminated. Everything is now out of the case, and lying on cardboard. Of course, it lit right up, and is mnual even as I type. Moving my hand over the whole megilla, feeling for hot spots, nothing is particularly hot. The smoke has not escaped as of yet Of the 4 c’s, one seemed weak, the others OK, fuse OK.
The sheet metal slide cover was not installed as I found it. It shields the wires from the inverter to the CCFLs. Could it be causing the inverter to balk? Last edited by tmwalsh; at I did check with a DMM, and got ‘instantaneous’ readings that quickly went to zero, making the manuxl they are not shorted, and do have capacitance.
As noted, it came to life once ‘out of the box’, majual I am now in the process of putting it back together piece by piece to see when it ‘stops’.
Dell Efpb – Page 34 – Badcaps Forums
The board looks like your photobucket shots, but none of the caps or transistors have red racing stripes Originally Posted by tmwalsh.
Information and picture clarity compositions should look like this post. We respectfully ask that you make servoce time and effort to read some of the guides available for basic troubleshooting. After you have mxnual through them, then ask clarification questions or report your findings.
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As long as I don’t put the inverter and logic into the metal cage and tighten down all the screws, it works. Originally Posted by Rtech. I tested the transistors using a transistor test meter serviec I built from a kit.
You hook to BCE, and press the ‘test’ e17fpb. A led will light up indicating “OK”. It has a pot to adjust current flow, and 3 of the 4 lit the led brightly, the 4th lit the led mwnual.
I was assuming that its gain was not on a par with the others. The led was barely lit as I remember. RTECH, I flowed all the transformer pins on the board, and also where the windings are soldered to the other end of the pins. From the descriptions I read, I wasn’t positive that it was the pins that needed re-flow, as they all looked good.
I had previously looked at the coils you mentioned, as I have had experience with that style coil, rather large windings, kind of ‘coarse’, in a Sony TV, that broke a winding!
This came from my brother, and the shield being ‘loose in the box’ when I got it made me think someone had been into the monitor before me. He stated he didn’t have time nor tools to venture into the set. Given that, I wonder if all the solder had been re-flowed already. It just does not look like a low quality solder job, anywhere. I have been thinking that one of the caps may be not so good, perhaps one of the 2.
It seems to be the only one that has a ‘direct’ connection to ground, and could mess up the load on the hv transformers. As it all worked out of the case but not in, I should vell on what has changed. I dont think we have any pictures of your boards – that might help us spot something. Any extra long legs on any components that might be touching something, any tall caps that might be touching something.
Is the “Keys” board fitting in ok back not touching anything. All connectors firmly connected and a working pc source connected? Can the lamps or wiring be arcing out anywhere to the case. Preview shows them, we’ll see, maybe. I’m sure I can do better, but don’t have a clue as to what they’ll turn out when I take them. There are no tall caps, all are as when I opened it up. Perhaps, likely, moved to a different spot on the board, as I removed and tested all.
The ‘keys’ board is in a bezel that surrounds the screen, and was insulated, etc, when testing.
SOLVED: Dell EFPb monitor black screen green flashing p – Fixya
Once I put the two boards in the case, and attach screws to hold the boards in place, it quits working. I don’t think it is a torque situation where the board is twisted or loaded funny.
The CCFLs will not light up when the boards are mounted in the outer metal shell with the perforated panels, and the power switch green led flashes constantly until the power switch is held to depower the board. These two pairs of lamps ride in servlce U shaped metal dsll that then slides into openings at the bottom and top of the display assembly. They operate fine when waving in the breeze, and also when they are inserted into the display cavity.
Well, I think fine, as I have the screen face down, and can see the ‘floating rainbow’ moving around. Cannot really observe the brightness as I can’t get a direct angle, but they sure burn bright. Testing that was my 1st thing after finding it didn’t work when assembled. Laid cardboard on the back of the display, connected the loose CCFLs, connected logic board, key button board, and power.
Install CCFLs and do the same test, lights work. I have not tried having the case separated from the panel by an insulator, and think it wouldn’t make a difference. The AC ground pin on the board does not connect to board itself, so it is not a power ground situation.
I haven’t really wrapped my mind about that except in the case of a TV chassis with a switch mode power supply. That I can visualize and understand.
In that schematic, the 2. May be I delk getting too old to do this stuff any more. The last thing I was thinking about was insulating the mounting screws from the ground pads on the inverter board, so that it would not connect through the screws to anything as the other side of the board is bare insulate.
I was fearful of some sort of floating ground sending power backwards through something and loosening the magic smoke to the world, so am asking if that is a valid test? Try mounting it in the frame with only screws in the holes with solder rings. All times are GMT The time now is Page 34 of Dell Efpb You mznual you looked at the transformer leads, but did you actually resolder them? Find More Posts by jetadm Bay area My Country: Dell Efpb Also check the tuning caps 0.
Find Mwnual Posts by budm. Dell Efpb Service manual for 17 3 FP – maybe same? Find More Posts by tom Dell Efpb I re-soldered all the leads on the solder side even though they looked fine.
Find More Posts by tmwalsh. Dell Efpb I did check with a DMM, and got ‘instantaneous’ readings that quickly went to zero, making the assumption they are not shorted, and do have capacitance. Originally Posted by tmwalsh p. Of the 4 c’s, one seemed weak.
Find More Posts by retiredcaps. Dell Efpb there are 2 inductors on these boards one associated with each pair of transistors, these are marked Lx, these have quite thick wire. Find More Posts by Rtech.
Dell E172FPb monitor black screen green flashing power button
Originally Posted by Rtech there are 2 inductors on these boards one associated with each pair of transistors, these are marked Lx, these have quite thick wire.
Dell Efpb I tested the transistors using a transistor test meter that I built from a kit. Dell Efpb As it all worked out of the xervice but not in, I should concentrate on what has changed. Find More Posts by selldoor. Dell Efpb Two pics attached?