Samsung 2493HM issue
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Re: Samsung 2493HM issue
Ok, i replaced the two fuses on the power board and i am back where i started. Meaning, i get a solid blue led and no picture. Im posting two pics of the opposite sides of the semi-assembled boards. The metal shielding is blocking access to the pins on those chips that i need to test. Is there a possibility of not connecting some of the components to do the test or will that yield inconclusive results?Comment
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Re: Samsung 2493HM issue
Leave the power boad face down. Unscrew the logic card and turn it face up (leave screws out). Put a piece of cardboard underneath the logic board so it is not touching the metal shield.
Leave the connections in place.
Now measure the voltage regulators on the logic card. You can still use a screw hole (GND) for the black probe.--- begin sig file ---
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Re: Samsung 2493HM issue
you can use the screw holes or the metal shields of the VGA, DVI or HDMI connectors.
i usually stick the negative lead of my DMM into the holes intended to fasten the VGA or DVI cable to the socket.
oh and you might wanna get the keypad out of the casing and connect it up.. otherwise you won't be able to turn it on (most monitors stay in off-mode when the button board isn't connected)
edit: in theory you should be able to use the whole metal cage as ground too. It should be grounded through the various screws of the PSU board and others.Last edited by Scenic; 02-24-2011, 01:39 AM.Comment
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Re: Samsung 2493HM issue
Ok, sorry for the delay. I forgot to hook up the control panel. Thats why i didnt get any readings at first. On the red circled chip i got 5.22, 0, 5.22 on the three pins starting from the top in the image. On the yellow circled chip i got 2.52, 0, 3.31 on the three pins starting from the top in the image.Comment
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Re: Samsung 2493HM issue
The yellow readings looks correct.--- begin sig file ---
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Re: Samsung 2493HM issue
1) Okay, with power off and lcd unplugged, put your multimeter on 200 ohms (if manual), and measure the red circled component to see if it is shorted.
Measure the resistance between pin 1-2, 1-3, and 2-3. List all the ohms measurements. A reading of 30 ohms or less suggests the voltage regulator is shorted.
2) Can you post a clear focused picture of just the red circled component? Clear enough that we can see/read the part number.
3) What is the board designation for this component? That is, what is the PCB marking for this component? Is it something like U102?--- begin sig file ---
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Re: Samsung 2493HM issue
If you have a manual ranging multimeter, set it to 200 (two hundred) ohms. Touch the black and red probe together. It should read 0.3 or 0.4 ohms. If it is higher than 1.0 ohm, there is something wrong with your multimeter.
If your multimeter reads "1" or "OL", it means the measurement is outside your chosen range. Don't confuse "1" on the left hand side of this display with 1.0 on the right hand side. The first means out of range and the second means 1.0 unit of your measurement.--- begin sig file ---
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Re: Samsung 2493HM issue
I have a sense that I'm not getting the message through.
Setting your multimeter on 200 ohms and getting a reading of "1" on the left hand side IS a reading. It implies the reading is > 200 ohms. That implies the voltage regulator is not shorted.
However, the DC voltage readings suggests it is "failing high". Normally a voltage regulator takes a voltage in (say 5V DC) and outputs something lower like 3.3V or 1.8V DC depending on the regulator.
With the part number you gave (6P741), I cannot find a datasheet to verify what should be the correct voltage. That is why I asked for a clear close up picture of the component.--- begin sig file ---
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