Re: Gateway FPD2485W - capacitor related?
Yes, they are called an SR-5 style fuse and come in a vast number of current ratings, they are very common in LCD TV's and Monitors. You can get them from Digikey, a 5A slow acting fuse is $1.46 quantity 1 here is a link 5A 250v FUSE
If your fuse is blowing immediately then you need to check your bridge rectifier, D850 (I think, the angle on the picture makes it hard to be sure) for a short. You also need to check the primary side switching transistor Q850 for a short before switching on with a new fuse. Do those checks with the power cord unplugged please! If you find a shorted component then replace the supply, most of these type supplies can be obtained for less than $75
NOTE: If you don't know how to safely use a volt meter DON'T TRY THIS! Take it to someone who does, YOU CAN KILL YOURSELF! You have been warned!!
If you find no primary side short then the next step is to verify the power supply outputs, keep the the power supply unplugged from the inverter and the processor board for this test. Watch out for the heatsinks on the primary side of the supply they and all of the primary side components are at LINE VOLTAGE and will give you a nasty shock if you touch them. CAREFULLY! Power up the supply and check for voltage on the output connectors. You should find a solid +5v on the processor plug (more than one pin) and maybe a +12v as well, there will also be several ground connections and some logic connections as well.
The inverter plug should be half ground connections and half +12v or +24v to run the inverters, along with two lines for inverter on/off and inverter brightness. If you don't find any output voltage or the voltages are fluctuating, replace the supply.
NOTE: If you don't know how to safely use a volt meter DON'T TRY THIS! Take it to someone who does, YOU CAN KILL YOURSELF! You have been warned!!
If the output voltages are present and stable then UNPLUG the POWER CORD. Let the power supply sit for 2 min to discharge the caps.
....... 2 min goes by.......
Reattach the processor power connection, again plug in the POWER CORD. Using the cautions mentioned above check if the output voltages are still the same. If they are not then you have a processor board putting too much load on the power supply, REPLACE the PROCESSOR board.
If all is looking good then UNPLUG the POWER CORD
........ wait 2 min ...........
Reattach the inverter power connection and test it like you did the processor power. BE CAREFUL there are dangerous voltages in these power supplies. The inverters typically put out around 2500v to light the ccfl tubes! EXERCISE GREAT CAUTION! If the inverter causes the supply voltage to drop then replace the inverter board.
If all the voltages are stable then you have a working power supply and your monitor should power up. Of course there are many other things besides a power supply that can cause it not to work, <Bummer>
GB
Anyone know a place to by this T5a 250V radial type fuse?
If your fuse is blowing immediately then you need to check your bridge rectifier, D850 (I think, the angle on the picture makes it hard to be sure) for a short. You also need to check the primary side switching transistor Q850 for a short before switching on with a new fuse. Do those checks with the power cord unplugged please! If you find a shorted component then replace the supply, most of these type supplies can be obtained for less than $75
NOTE: If you don't know how to safely use a volt meter DON'T TRY THIS! Take it to someone who does, YOU CAN KILL YOURSELF! You have been warned!!
If you find no primary side short then the next step is to verify the power supply outputs, keep the the power supply unplugged from the inverter and the processor board for this test. Watch out for the heatsinks on the primary side of the supply they and all of the primary side components are at LINE VOLTAGE and will give you a nasty shock if you touch them. CAREFULLY! Power up the supply and check for voltage on the output connectors. You should find a solid +5v on the processor plug (more than one pin) and maybe a +12v as well, there will also be several ground connections and some logic connections as well.
The inverter plug should be half ground connections and half +12v or +24v to run the inverters, along with two lines for inverter on/off and inverter brightness. If you don't find any output voltage or the voltages are fluctuating, replace the supply.
NOTE: If you don't know how to safely use a volt meter DON'T TRY THIS! Take it to someone who does, YOU CAN KILL YOURSELF! You have been warned!!
If the output voltages are present and stable then UNPLUG the POWER CORD. Let the power supply sit for 2 min to discharge the caps.
....... 2 min goes by.......
Reattach the processor power connection, again plug in the POWER CORD. Using the cautions mentioned above check if the output voltages are still the same. If they are not then you have a processor board putting too much load on the power supply, REPLACE the PROCESSOR board.
If all is looking good then UNPLUG the POWER CORD
........ wait 2 min ...........
Reattach the inverter power connection and test it like you did the processor power. BE CAREFUL there are dangerous voltages in these power supplies. The inverters typically put out around 2500v to light the ccfl tubes! EXERCISE GREAT CAUTION! If the inverter causes the supply voltage to drop then replace the inverter board.
If all the voltages are stable then you have a working power supply and your monitor should power up. Of course there are many other things besides a power supply that can cause it not to work, <Bummer>
GB
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