Re: Dell E152FPg - 2 seconds to black
Attaching some new photos, since my originals seem to not be working...
Attaching some new photos, since my originals seem to not be working...
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Re: Dell E152FPg - 2 seconds to black
Your to the point where I would ask for help also,
So HELP
Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!
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Re: Dell E152FPg - 2 seconds to black
This is a Royer oscillator; it's used by a number of manufacturers, most notably Benq (Dell and HP). There are several possible causes - bad solder joints on the transformer are the most likely cause but since you have soldered them we can eliminate that.
The tuning cap - it looks like .1uF, 100V is another suspect, as is the zener diode. Don't substitute transistors - this circuit is fussy. And if one transistor is shorted always replace it's companion too.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
What would the companioin to Q110 be? Do you mean that I should replace all 3 transistors?
The zener diode is ZD101 - any idea the value of that? I've never purchased a zener diode before, so I'm not sure what to order here.
The box cap is a .18uf box cap. That I've ordered before, so I can get those.
Anyone know where I can get the 1606 transistors?Comment
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Re: Dell E152FPg - 2 seconds to black
ZD101 is a location number, not a part number. It should be identical to the zener at ZD100. I don't have any idea what the part number would be.
Q106, Q107, Q108, and Q109 are identical parts and are probably NPN transistors.. Q105 and Q110 are also identical and are usually FETs, which would explain why the 2SC1815 smoked.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
One of the nice thing about have 2 identical monitors (one working and one not) is that you can compare multimeter readings.
So with power off on both, you can measure each component in the inverter section and and compare which one is not correct.--- begin sig file ---
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Re: Dell E152FPg - 2 seconds to black
That is probably a 2SB1116. That could be verified by doing a diode test on the pins of Q105.
Without knowing what country you are in, it is difficult to make a suggestion. It's specs (PNP, 80 volt, 1A, .75W, 120 Mhz) should be easy to match.
PlainBillLast edited by PlainBill; 05-11-2011, 06:12 AM.For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
Um, yeah, so sticking a NPN transistor in a curcuit where a PNP is called for is generally not a good idea.
The ensuing smoke that arrived on my workbench was proof of that.
I located some 1116 replacements at Mouser, so I've ordered 4 of them. When they arrive, I'll swap them in and see if they cure my issue. Hopefully I haven't done any further damage to this board by using the wrong spec....Comment
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Re: Dell E152FPg - 2 seconds to black
Further damage - probably not. From experience I know this circuit is a bear to troubleshoot once you get beyond the obvious failures. There are multiple feedback loops that will destroy the transistors within seconds if something isn't correct.Um, yeah, so sticking a NPN transistor in a curcuit where a PNP is called for is generally not a good idea.
The ensuing smoke that arrived on my workbench was proof of that.
I located some 1116 replacements at Mouser, so I've ordered 4 of them. When they arrive, I'll swap them in and see if they cure my issue. Hopefully I haven't done any further damage to this board by using the wrong spec....
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
That's the last time I place a big order at Mouser and choose the 'don't ship until all my parts are in' option. Cripes.
Got my 1116's today. I swapped both of them to be safe.
Still dim. Now what?Comment
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For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
Sorry about that, I thought I mis-typed. I meant to type 'still going dim'
But I went back and double checked. The monitor IS in fact dim now, not even firing for 2 seconds any more. What does that mean?Comment
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Re: Dell E152FPg - 2 seconds to black
It means we aren't communicating well.
Let's agree on these terms. A normal display can be seen easily in full light; it will also light up a dark room.
'Two seconds to black' starts with a normal brightness screen, then it goes dark. An image may be visible, especially if a flashlight is used, but it won't light up a dark room.
A dim screen can be easily seen in a poorly lit (or dark) room, but is much harder to see in a brightly lit room.
'Two seconds to black' indicates the protection circuit has shut down the backlights. 'Dim' indicates the backlights are still working, just at low brightness.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
I agree with everything you just said. This problem began as a '2 seconds to black' problem. Somewhere after resoldering the transformer and replacing Q105 I lost the '2 seconds' part. Now the panel does not attempt to light at all.Comment
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For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
Use a DMM, test on the circuit board.
Refer to the picture of the bottom of the power supply / inverter you attached to post 21. In the upper right corner of the picture is the connector for the cable to the signal card. The pin on the extreme right would appear to be Brightness, the one next to it is BL_ON (On / Off).
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: Dell E152FPg - 2 seconds to black
hi guys, this thread got a different power board than the one i got here. Could anyone please tell me the exact part number of u101 because mine got burned that's why I'm having no power/ dead set.
i know i have to post another thread but i cannot just yet because I think I'm just a newbie here and I'm guessing this is my first post/reply. So please pardon me.
Anyway I'm attaching a pic I downloaded from Ebay.
The 8-pin IC on the bottom is the one that i need to be identified. Thanks..Attached FilesComment
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Hello,
YouTube video of the problem encountered: https://youtube.com/shorts/q7TLNv36LUo
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good morning all,
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Hello,
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