I have I unit hp 2009f lcd and suddently no power, i diagnose the power board and all capacitor are ok, fuse also ok, and i have no idea where to diagnose next.
hope you all can help me
hope you all can help me
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Re: HP LCD 2009F No Power
1) Does the power LED light come on at all?
2) Post clear focused top down view pictures of all your boards following my sig file below EXACTLY?
3) Here is an example of the picture composition that we want.
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Re: HP LCD 2009F No Power
1) The LED light off - No power activity
2) No 1 on the picture is like transistor - A2764A1 927050 cannot find the datasheetAttached FilesComment
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Re: HP LCD 2009F No Power
1) Please post a picture of the main board as well.
2) On the connector from the power board to the main board, are there any DC voltages present on those colored cables? If yes, list them all with their color or pin number. At least one of them should be 5V DC.Last edited by retiredcaps; 03-12-2012, 10:21 PM.--- begin sig file ---
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We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
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Re: HP LCD 2009F No Power
Any DC on that large 450VDC cap? There should be at least 300VDC on that cap.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: HP LCD 2009F No Power
1) My guess is that the small capacitor to the left (as per your upside down picture) of D852 is the startup capacitor.
a) What is the uF and V of that cap?
b) What is the DC voltage across the cap?
2) My guess is that the SMPS IC sits on that little vertical board just north of the startup cap. It might be a 8 pin IC.
a) If so, what is the part number of that IC?Last edited by retiredcaps; 03-19-2012, 02:29 AM.--- begin sig file ---
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Please do not post inline and offsite as they slow down the loading of pages.
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Re: HP LCD 2009F No Power
Refer to page 2 of the datasheet at
http://pdf1.alldatasheet.com/datashe.../LD7575PS.html
1) Pin 8 is HV. Pin 4 is GND. Pin 6 is VCC.
2) What is the DC voltage at pin 8 using pin 4 as GND?
3) What is the DC voltage at pin 6 using pin 4 as GND?
4) What is the resistance of R852?
a) What markings are on that component?--- begin sig file ---
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We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: HP LCD 2009F No Power
My monitor also could not power ON 2 days ago. Yesterday, I managed to confirm Power Transistor A2764A1 abnormal. However, could not find datasheet for this part.Comment
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Re: HP LCD 2009F No Power
Might be a AP2764 mosfet.Comment
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Re: HP LCD 2009F No Power
Sir whats the possible problem of this kind of trouble.Comment
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Re: HP LCD 2009F No Power
Hp 2009f LCD no power. Cause by sudden brownout, after it came back of power from main outlet. Theres no power at all of the LCD. Pls give me your answer. TnxComment
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Re: HP LCD 2009F No Power
Sometimes these are as easy as replacing the main fuse on the power board.
With power off, check the main fuse with the ohm setting. It should have very low ohms if its good.
If the fuse is good you need to check for voltage at big filter cap. With power on ****Be careful*** you check for DC voltage on the 2 legs of that big main capacitor. I like to steady my elbows on the bench so the probes don't slip. It should have a very high voltage. 300+ volts DC.Comment
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Re: HP LCD 2009F No Power
Can you Trace
this Area. of D587.
Possible Shorted...Comment
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