Question about Compaq (243890-001) 250-Watt Power Supply

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My Pentium II power pack blew due to excess voltage, i have changed the the fuse, and two other components that got bunt. if i put the power pack in its board, it wont work. But if i put it in a pentium III board it will power it. pls i need a solution.

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SOURCE: i'm using compaq deskpro board. pentium III 1ghz.

code 304 = Keyboard or system unit error. Not repairable. You will have to replace the system board.

Posted on Nov 19, 2009


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Why would my iron heart Lainey 212 combo amp combo be blowing fuses?

Because some component in the amp is failing/failed and drawing too much current. The amp needs a repair shop. Poking around without knowing what you're doing can expose you to leather voltage. Don't do it.

Oct 13, 2016 | Laney IRT60H Ironheart Guitar Amplifier...


Fuse keeps blowing (LCD,Projection,Standard,Flat panel TV.)

A blown fuse is very common on Electronics Appliances like TV's, DVD's, Receiver's etc. Sometimes fuse blew because of power surge, replacing alone with exact volt/ampere cure the problem. It is necessary to understand that blowing of fuse second time around you replaced it means that you have a shorts in the circuit.


Troubleshooting the shorted parts on the power supply section needs an experienced in electronics because you will isolate the shorted parts one-by-one. Since we are working on the power supply section (110v/220v AC) this is fatal and can cause you an electric shocked with a simple mistakes only.

Usually shorts are quite near to the AC power line where you can locate this components :

1. Power Cord - Even a very low of chances for short but still to be checked because this is a part of AC line input. This is due to frequent bending and pulling, internal wire will shorts.

2. VDR (Voltage Dependent Resistor) this serves as a guard for voltage fluctuation or excessive voltage to avoid further damaged to other parts. If there was an over voltage(reach the peak allowable voltage designed by the manufacturer) from the AC line, this parts will vary its resistanceand drive the line to excessive current which causes the fuse from blowing.

3. Posistor (for standard TV) - connected here the degaussing coil.Check it also for shorts.


4. Rectifier Diode - Some unit this is come in bridge type package.
This is very common parts that are prone for shorts. For more info click this link

5. Main filter electrolytic capacitor.


6. Voltage Regulator IC/Transistor.
7. H-out Transistor (for standard TV)
8. Flyback Transformer- (for standard TV)

Isolation technique is done to locate the shorted parts. Pull-out the suspected parts one-by-one in the board and test it using the ohmmeter.

Hope that it may help you find the solution on your problem.

Have a nice day!
Thanks for using fixya


on Jan 30, 2011 | Televison & Video

1 Answer

We had a power surge and now my 26 inch flat screen tv emerson wont turn on.... please help !!

When a fuse blows it only means one thing. The power supply board had developed a fault. -it could be due to many factors as the whole circuit board for power is in one package - or PSU board as they are known and any one of the components can fail.. Of course as you mentioned of a power surge- the damage of an abundant or over supply can trigger the input IC ( 110 to 230 variable voltage) to fail. Changing that may not solve the problem altogether as they are other diodes and rectifiers associated with it. Most people or repair men merely swap the whole board due to lack of testing facilities and normally send the defective board to the supplier who will have all the test bench components wired up at his workshop to perform a component check /replacement. Like in your case it might just be logical to get hold of another power supply board ( either new or re-conditioned) and fix it up and enjoy watching tv rather than waste a lot of time trying to identify the exact component failure on your LCD tv. But of course if you are really keen to do your own repairs then look at components just next to the fuse holder and attempt to test individual components and replace same if faulty. Hope u succeed as at times basic components replacement works.

Feb 15, 2015 | Emerson Televison & Video

1 Answer

Keep blowing the main fuse.

To which circuit section did you replaced the fuse? Main power retulator? Just understand, the fuses are used to protect the circuit and TV from any short circuit or over voltage. Without any one of these, no fuse will blow up. If it was due to over voltage, the set should work after a fuse replacement. But here, the fuse blow up again, means, there is some thing shorted component/s. Check which component is shorted, and replace it, before replacing an other fuse. One more thing to say is, never insert a fuse other than specified. The voltage and ampere specification to fuse, will be marked at the circuit board, very near to the fuse clamp. Insert a fuse of same rating only. Using other fuse, rated higher ampere rating, might make things worse.

May 27, 2013 | Mitsubishi WD-73827 73" HDTV DLP TV

2 Answers


Hi pcruzx,
Sometimes replacing the fuse alone with exact voltage and ampere ratings will cure the problem(you're lucky) but not all. Sometimes further damaged gone to other parts most especially the voltage regulator transistor/IC (mounted in heat sink) and the opened the fusible resistor in line with the supply(B+).
First check the fuse, for sure it was already blown. If you've replaced the fuse and immediately blew again after powering on the unit, this was an indication of shorted parts near the AC line. Click this LINK for more info.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

May 01, 2011 | Alesis Dm5 Drum Module 18 Bit

1 Answer

Hi ther the fuse has blown on the speaker out circet on my new amp any ideas why this would happen?

The fuse blew because of excess current. The cause of the excess current is either excess volume, a short in the speaker, OR the amp has failed and is shorted to one of the power rails internally and is driving DC current out.

Replace the fuse and use a meter to check the output voltage with NO speaker connected. It should be under 1/2 volt period. If it is, then check the resistance of the speaker. The DC resistance should be a little less than the rated impedance. Otherwise if the amp is kicking out a higher voltage or blows the fuse again, have the amp repaired.

Mar 28, 2011 | Ashdown Klystron 500w Bass Amp Head

1 Answer


well first is there a fuse you state fuse available not that one is there -----the surge didnt blow the breaker or fuses either if currant made its way to your components --as to why fuse didnt blow --- no fuse ---surge came through ground --surge blew something before fuse blew your case blew power supply

Jul 21, 2017 | Gateway 180Wt Power Supply NPS-180EB...

1 Answer

Sony DVD-NS575P Power Supply

well I use to buy these things at servicing stations, depending what brand your dvd was.
but I sugest to buy a new dvd player, there is a posibilities that the high voltage just blew off some parts and components too.

BUT.. try to check your fuse first maybe thats the one just blew off. change it and try it again. at this time make sure everything is good and ready to go, and test.

May 10, 2008 | Sony DVP-NS575P DVD Player

1 Answer

Ticking sound

ticking sound (like a Watch) coming from around the Flyback Transformer but I don't see a spark is called EHT voltage . if eht voltage is ok 1 check filament is glowing or not if it is ok check voltages on crt. 2 if it is ok check luminance section in chroma section. if filament is not glowing check for low eht due to hor section check power supply output also. good luck

Sep 18, 2007 | GE 25GT270 TV

2 Answers

TX-R3079WHX/XAA Blown fuse

greetings from belize make good checks in your power supply replace your voltage regulator it has an short which is activated after accumulating heat.change the horizontal transistor.and the bias diode the feeds to the B+ to the flyback.if that does not solve the problem replace the flyback.your problem is intermittent so you cannot check voltage just replace components matter of fact replace all the components in the power supply you can buy a kit from in miami florida.good luck.

Dec 27, 2006 | Samsung TX-R3080 30" TV

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