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No power. no start up power not going beyond bridge rectifier.

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Sometimes the circuit is wired that the relay must be energized before you get voltage to the bridge rectifier positive pin. If not, be sure the ground of your test lead is on the hot side ground and not common ground when making the measurement at the positive pin. If wired as I mentioned, trace down the circuit that has voltage to the coil of the relay starting from the AC voltage source.

Posted on May 24, 2011

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No red light or power

I've had about 3 or 4 similar sets like this....all have had a flash-over around the bridge rectifier to metal chassis. (you will clearly see the flash-over on the metal chassis). Clean back the print re-solder bridge rectifier,fit a new fuse (usually around 4 to 6.3 Amp)

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My bx1021 speakers just make a low bass sounding buzzing noise when I turn them on. The volume is all the way down and there is nothing plugged into the aux or audio inputs. I unplugged the power and...

The ripple filters on the power supply probably blew.
Look for electrolytic capacitors connected right after the bridge rectifier.
Chances are they will be bulged at the top, leaking at the bottom, or completely missing (exploded).
Replace the filter caps in the power supply, and you should be good to go.
I suggest upping the voltage rating from the originals.
IE - if the original caps are 16V, use 25V caps of the same uF rating.
Check the bridge rectifier too, to be sure none of the diodes went bad.
If any of the diodes in the rectifier are bad, you will have to replace the diode, or the rectifier if it's a 4 post rectifier module.

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Soundcraft GIGRAC 600 pre-amp power supply keep blowing the low valve resistor 1ohm. they are the resistor just before the bridge rectifier, for the low voltage feed. Once resistors replaced the unit...

The resistor is acting as a fuse and will continue to blow until you fix the REAL problem. LIKELY the filter capacitor(s) beyond the bridge rectifier are failing. One needs to use test equipment to measure the current through the resistor and see if it is reasonable. The capacitors can heal briefly and then start to short. One should also check the rectifier in operation with an oscilloscope as one diode could intermittently short.

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I have a automotive battery charger thats a Snap-On BC4200 I believe the rectifier is burnt up in it and am looking for a replacement part. Snap-On book says the part number is BC4200-2000R but it...

if you can find out the current it takes you can go online and buy rectifiers all day long they are pretty cheap too also you need find the type of rectifer like full wave, half wave, bridge rectifier. the bridge is usually the most common tho.

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Philips dvdr 890 wont power up normally its indicate error number please help.

your SOPS power supply is defect.
you can buy this in the store different components.
the first tings that you have to do,
check the fuse inside 2 or 3Amp.
if blown replace
check the rectifier bridge 4 diode or Bridge rectifier B1500C250
check the power transistor BUT12AF if broken replace this also
after this your power suply chould work, if it not work
check capacity 22/63V and 100/25V and replace if nessesary.
if after this the supply is not working mail me.

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1 Answer

Power supply no go. Has DCfrom bridge.

There shoud be a big elcetrolytic cap connecto the bridge rectifier output, ti should have about 150~160 vdc on that cap, if you do not have the dc on the secondary side, ti may be because it sees short circuits (you will hear fainted ticking sound), the power supply should have 5v and 12v at all time. Try heating up the primary circuits with hair dryer to see if will kick on. Post some picture will help, see example here:

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1 Answer

My subwoofer IC got burned because i accidentally plug it to a 220v power supply, mine is only 110v i want to know the IC# subwoofer.

Most likely what got burnt is the bridge rectifier in the power supply section of the electronic circuit. This usually takes the shape of either a single 4-legged IC, or a group of 4 rectifying diodes connected in a bridge configuration. If you disassemble the unit to which the power cord is attached & trace the circuit starting from the terminals of the power chord, you can easily identify it. You will need to replace the 4-legged IC or the 4 rectifying diodes.
You will also need to replace the fuse, since it is usually likely that it gets burnt if the unit is attached to 220V instead of 110V.

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2 Answers

Same Problem, diodes fell out of bridge rectifier assembly

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The broblem is in the south bridge, some it can be re heat using hot air..

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