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Found Power Supply SCR Short Circuit and internal Fuse blown. Where can I get a replacement SCR in Melbourne Australia (or anywhere else) thanks, Con

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I found a hp 2509 b computer monitor and I can't get it to power on can it be fixed?

Take it to a TV technician in your area. (If there are any left)
Switch mode power supply probably has a blown internal fuse or bad or leaky electrolytic capacitors.

Aug 21, 2014 | Computer Monitors

1 Answer

Blown fuse on a ilpi-009 power supply

hi, i don't know the exact power board you speak of, most fuses for power supply protect ac inboard power, and backlights. if backlight inverters touch ground or ground out, this will blow fuse. otherwise, the fused circuit is used for main inboard power going to primary capacitor. take an automotive fuse holder and solder test leads long enough to work with, install 4 amp blade fuse and jumper/solder the circuit to the fuse on the board and power on the monitor. if all goes well, probably just power surge or outlet grounded. if blows fuse, check to board for obvious burns or blown capacitors. if not there, unplug backlights and power on, if still blows, check to make sure no direct conact with board and back of screen. just be thorough about looking carefully for shorts if there is one. and don't forget to replace the factory fuse on the board with the correct one after you finish repairing, don't leave that automotive fuse in. good luck.

May 10, 2010 | Emprex LM2201 22" LCD Monitor

4 Answers

Wont power up,!help

This 2006 model, and more likely to have bad caps by now, please see picture here to see what goes bad in SAMSUNG and other monitors just as well:
Post back what you find inside.

Apr 02, 2010 | Samsung SyncMaster 940MW 19" LCD Monitor

2 Answers

My monitor 940n samsung syncmaster gone in black...

I have just had this same problem. The problem mostlikely is a blown fuse on the inverter board. Mine was blown on the board and also a Capacitor (470nF/25V) was bad beside the Fuse.

I replaced both and monitor is working now again. After install the picture was a little grainy with little artifacts. In another post i found that the Power Supply board needs to be cleaned for unwanted residue. After that picture was fine again.

BEWARE that you need a soldering iron and a steady hand to replace these parts. If you are unfamiliar with soldering at all have an expert take a look at this. The Power boards uses 220v so DO NOT connect it to the Power when opened.



Aug 10, 2009 | Samsung SyncMaster 940N Flat panel Monitor

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Monitor just went off. no power light. changed fuse but monitor is completely dead

possibly a power surge killed the main board in the LCD. if the fuse was blown i would suspect a power surge. you could replace the circuit board. either that died or the power supply died- depending on if it has internal or external power supply that might be blown as well.

i would take it to a professional LCD/ LAPTOP repair person. they should be-able to test it and let you know what needs to be replaced

Aug 06, 2009 | Dell E152FP 15" Flat Panel LCD Monitor

2 Answers

Samsung lcd monitor 153V has no display power indicator (green) is ok found 1 ic AE3U1T burnt. is this ic available or has the psu and backlight panel pcb to be changed..

Samsung 153V LCD Monitor Power Supply Repair Tips

Troubleshooting Samsung 153V LCD power supply is just like troubleshooting those CRT type. This monitor came in with no power symptom. If you are first time repairing this type of power supply, I recommend you to first remove the switch mode power transformer. Then test every single component in the primary section, before you continue to check the secondary section.

You have to be good in testing basic electronic components in order to detect the fault. You can always browse through my website just in case you do not know how to test basic electronic components. If you do not know the right way to check, you might miss out a bad component and this will lead you not able to solve the problem. After carefully checking all the components in the power supply section, I found the filter capacitor do not have any reading using digital capacitance meter (open) , the two round type fuse also open circuit, 1N4744 15 Volt zener diode short circuit and lastly the power IC TOP247F blown!.

Testing the SMPS (switch mode power supply) primary winding with a **** smith fly-back tester, shows green bar which indicates good winding. What we left here were the secondary diode and filter capacitor. Upon checking them with analog meter and ESR meter, found all of them to be good condition. Other area like main board and inverter board also looks okay (Power failure rarely affect these two circuit). Now we have confirmed that only five components found to be faulty.

One by one the components were replaced (except one fuse) and just before you switch on the power supply, make sure you connect a 100 watt light bulb across the live ac line. Once it is done you can then proceed to switch on the LCD monitor to look at the brightness of the bulb.

If it very bright, this suggests that there are still short circuit somewhere in the power section. If it dim or totally goes off, you can now place your red probe to the secondary side to check if any dc present at their respective line. If there are DC voltages present at the output, you can switch off the power, discharge the filter capacitor (for safety purposes), remove the light bulb and connect back the new fuse to its original location.

You are now hundred percent sure that the LCD power supply won

Mar 23, 2009 | Samsung SyncMaster 153V 15" Flat Panel LCD...

3 Answers

HP LCD Monitor w1907 Blowing fuse - no display

1. Visual inspection of the board, wires, etc. for short (expect you have already done this)
2. Start at the source. Need a meter to test voltage coming into the system (is it really 110VAC?)
3. Then the obvious, which is not so obvious or you would have fixed it by now. Need a meter to test components. Test switch. Maybe the power swtich is shorted!? Test all other components one at a time. Including all the wires. Do any of them feel stiff or look like the insulation might have melted a bit? Might need to remove wires to isolate components to test.
4. Since the power switch is not part of the problem then it is before the switch. When it was working, did anything run while the power was off? yellow LED? fan? Components like power diodes, bridges and rectifiers are typically blown by now also.
5. A filter capacitor, usually large, when shorted internally, can be the problem. Only test for short. Must remove one lead, watch polarity.
6. You can only blow so many fuses before the real problem, which the fuse is protecting, will appear...usually a disasterous end. I blew up a power supply to a washing machine after the third fuse. It fried the whole board with a very loud pop, bright flash and fragments of shrapnel flying everywhere. Please be careful!

Troubleshooters rules:
1. When you can't find the problem you are looking in the wrong place. Look somewhere else. Suspect everything, even the smallest detail is often the real problem. Like, what have you ruled out? Did you already assume the switch was good, the wire from the wall was good, the outlet was good, the power was good?
2. When you don't know what else to do, do something. Deliberately break something to see what will happen. (This is not a rule that I would use in this case but might serve you well in troubleshooting other problems in the future.)

Nov 28, 2008 | HP Pavilion F1703 17" LCD Monitor

1 Answer


If you can open the cover of your monitor try to locate the fuse maybe the fuse is busted replace it.
if the fuse is blown or busted again there is short circuit in your power supply maybe the diode or the power transistor is shorted you need this to bring to the shop for services

Apr 15, 2008 | Hyundai ImageQuest L17T 17" LCD Monitor

1 Answer

E17T Monitor

monitor problem any short circuit may be in secondrry side of monitor

Mar 15, 2007 | E-Machines E17T 17" Flat Panel LCD Monitor

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