Re: DELL 2405fpw
Ahh my final post with pictures of the repair and a working monitor. I would like to thank everyone once again for their help!...
Mirage00
Senior Member
Last Activity: 07-19-2012, 08:36 PM
Joined: 06-25-2012
Location: New York,ny
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Re: DELL 2405fpw
I ordered this one today.
[url]https://cdn.badcaps-static.com/pdfs/443e8e1c4948c2ac315f474ea943619a.pdf[/url]Re: DELL 2405fpw<br /> <br /> I or...619a.pdf[/url]Leave a comment:
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Re: DELL 2405fpw
Good News!! I disconnected the DC-DC converter I installed (since it was putting out 11v) for some reason and connected an old computer SMPS 5v line to the L1 connector to the T-CON board and TA-DA! The monitor worked perfectly
After further research I realized I purchased a negative polarity version of the DC-DC converter board.
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Re: DELL 2405fpw
I was afraid of that. Thanks for all your help though. It was an interesting experience.Leave a comment:
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Re: DELL 2405fpw
Update... it looks like the new power board is output 11v instead of 5v. Would over voltage to the t-con board cause white lines like that?Leave a comment:
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Re: DELL 2405fpw
OK here is my latest update. I replaced the 5v power circuit on the PCB according the link I posted above. The screen actually works now BUT I have white lines through the whole thing. I can see the computer screen through the white lines so somthing is working right. Not sure what to look at now. I attached pics of the modification and the monitor....Leave a comment:
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Re: DELL 2405fpw
Yeah. Ill add a separate 5v supply and see if that works.Leave a comment:
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Re: DELL 2405fpw
Ok no good
Installed MOSFET and D19 DIODE and left the T-CON disconnected... Took a voltage reading of the DRAIN and it was 0 again. Both gate and source where 18.8 where they were last time. So I guess the gate logic is bad?
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Re: DELL 2405fpw
Ok I removed the MOSFET and tested OHMS between drain and source... it stayed on 1. So I guess its not shorted?Leave a comment:
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Re: DELL 2405fpw
Ok I think I follow. Keeping in mind that I am not an expert, where would I connect the resistor ? Do I connect one end to the dran and the other end to what?????Leave a comment:
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Re: DELL 2405fpw
Ok everyone I have one last question before I proceed since the parts (Zener diode for D19 and 5305S MOSFET) arrived today. In speaking with the person who repaired his 2405fpw by adding its own SMPS to supply 5volts to the T-CON board, he said if I replace the MOSFET and diode, chances are it will blow again and could cause more extensive damage to the unit. He reccomended just replacing the 5v supply as he did. What do you guys think? Doesnt the diode (d19) prevent downstream circuits and gate logic from damage?
ThanksLeave a comment:
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Re: DELL 2405fpw
Got it.. thats why he said "without further help from DELL (schematics)" he had to replace the regulator. Thanks again budmLeave a comment:
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Re: DELL 2405fpw
One more question.. in the other thread he said "I am not sure I want to replace the FET, for fear that the gate controller logic may be fried"
I would imagine the zener is their to protect the circuit in case the FET blows. What did he mean by gate controler logic. Isn't that within the FET?Leave a comment:
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Re: DELL 2405fpw
Yeah I ordered the Zener and Mosfet from digikey last week. Should be here this week. I will let you guys know what happens. I just realized didn't get a surface mount zener. Hopefully it wont be an issue soldering it?Leave a comment:
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Re: DELL 2405fpw
Ok. BTW, I found this website and wound up ordering a 6.8v zenner. Apparently this guy had a similar problem with the video after he fixed the power supply issue. He measured the output of the drain on a working monitor and determined it should be 5v. Interesting how he fixed the issue. Let me know what you think.
[url]http://www.cse.iitb.ac.in/soumen/Sysadm/Dell2405fpwRepair/[/url]
and I also found this one.
[url]http://forum.eserviceinfo.com/viewtopic.php?t=63329[/url]Re: DELL 2405fpw
Ok. BTW, I found...Leave a comment:
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Re: DELL 2405fpw
Ok will do and what diode? thx...Leave a comment:
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Re: DELL 2405fpw
Ok all readings on the Q1 are 1 (yes left side of DMM)Leave a comment:
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Re: DELL 2405fpw
How do I test if I get a short circuit on that Q1 as you asked....Leave a comment:
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Re: DELL 2405fpw
Its the component covered in black rubber. It's had sticker on it that read
19-40
229-011
LSELeave a comment:
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Re: DELL 2405fpw
Did you find it...Leave a comment:
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