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Does not power up

Dell has good power supply, three green leds light up then after a few seconds it shuts down. i am lookin for schematic diagram so i can read where the power goes....

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Backlight problems


If the capacitors in the power supply are bulging that indicates that they have failed internally and need to be replaced. That would cause the back light inverter to shut down just like you are having.Replace the capacitors and you should be good to go.


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There are three green lights that stay on by the on button

try changing the memory cards first, my cards appeared to be good but after a little warm up the laptop would freeze up with the power and bottom three leds staying on then shutting down. i changed the memory out and the problem quit. i was using cheap memory cards.

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I have a Graco baby monitor, it started making a noise for the last 2 days, could it be a battery problem (even with power connected)? The monitor is about 1.5 years old.

Annoying! happens to us too frequently, but this works. We ended up buying a new one and returning our broken one after owning for three months From Manual:) 5. Turn on the Nursery Unit using the On/Off switch on the side. The green power light should come on. 6. Within a few seconds, the Parent Unit will lock on to the Nursery Unit and the top four (4) green LEDs will shut off. A second later, you will hear a series of beeps and the connection LED should change from red to green. Your monitor is now ready for use. 7. If the top four (4) LEDs do not shut off, power off the Parent Unit and the Nursery Unit and repeat steps 4 and 5 above. 8. If the connection LED on the Parent Unit does not change from red to green and the unit begins to beep, press the channel "ch" button on the Nursery Unit. Within a few seconds, the Parent Unit should lock in on the Nursery Unit and the connection LED should change from red to green. You may hear an audible beep during this process. 9. If the Parent Unit is still unable to lock in on the Nursery Unit (connection LED will be red and the unit will beep), power down both the Parent Unit and the Nursery Unit. Wait for 10 seconds then hold the volume down button on the Parent Unit while pressing the On/Off switch. When the unit powers up, you will hear a single beep and all of the soundlights will illuminate. Release the volume down switch and within 2 seconds you will hear two beeps and all of the Sound Light LEDs will stay lit and the bottom LED will be red. 10. Repeat steps 5

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Hp flat panel monitor comes on shows logon and then blank screen

Ok, another words, monitor powers up for few seconds and shuts down by itself. If green LED on the front panel turns off as well or stays on?
If stays on, then inverter turns into protection mode because of old backlight lamps.
If it turns off in same time with an image on the screen, then there are some bad electrolytic capacitors in the power supply.

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1 Answer

PC SHUT down

three things i find to cause this,

one, the power supply is bad,
two, the power connector is lose or not push in
three, the heat sink on the processor has come off. This will cause the cpu to over heat and self shut off.

to test the power supply, pull the connector off the mother board and short the green wire to any black wire with a paper clip, this will switch on the power and see if it stays on.

if you need to replace it, you cannot use a regular atx power supply. E machines have a different pin out.

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Dell Dimension 9200 keeps shutting down and won't start up

the key issue on the uncommanded shutdown is the POWER LED. If upon shutdown, the power LED Flashes AMBER, then the power supply is suspect.

If no flashing amber indication, then the next think I check is the heatsink (Processor overheating) remove, clean and apply arctic Silver heat transfer paste, see if the issuje goes away

Last but not least if the system is failing to boot, and displays a 3 4 diag LED code, then you may have a RAM module that is bad or may just need reseating. Running diags off of the Rersoujrce CD is something to look at too

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If the power supply outputs are good! Then I would say the back light inverter is bad! If the screen stays black and does not come on.

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could be three different things.


1. could be the crt itself as a tube with dfective phosphure wil do this


2. could be the vertical ic on the crt board


3. could be the focus pac.  located in front of tv with 6 adjustment knobs on it.

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Hitachi 50ux58b

If you have Hitachi model number 50UX58B, 60UX58B, 50UX58K, 60UX58K, 50SBX78B or 60SBX78B and you have the following symptoms you may want to grab a repair kit from They have put together a kit that includes the parts and instructions to fix these models. This is a fairly common problem with the above model numbers. It is typically caused by a blown capacitor and pico fuse. Again, you can get a kit from the above address. 
Here are the symptoms...

Primary Symptom: No Audio or Video. Power light will come on briefly then shut off.
Other Possible Symptoms : The green LEDs on the circuit board light up for a few seconds then turn off.

Hope this helps,

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