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Blown crossover I pulled that crossover out and one of the resistors (?) is halfway disconnected from the circuit board with one end blown off. The rubber housing of this component is partially melted away.

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Sounds like the crossover is smoked. Unusual, but it happens. Just call a Peavey service center for the part number and you should be able to order direct from Peavey. If you have problems getting the number, let me know and I'll try and get it for you.

Dan

Posted on Aug 18, 2008

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6ya6ya
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Posted on Jan 02, 2017

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The treadmill have dcmd67 control board I need to know what value resistor R 19 have


I can't help you (directly) with the resistor value, but be aware that if it exploded, there is probably another bad component (such as a capacitor, transistor, and/or an SCR). Replacing only the resistor may result in the same problem, or may not even work at all due to another bad component. If you do find out the value, try putting in a resistor of the same value, but with a higher wattage rating. I once had a washing machine in which the model had a known problem with circuit boards blowing. I solved it by replacing a bad transistor and installing a higher wattage resistor that had blown up like yours. It never failed again. The way I found the value of the blown resistor is, I looked up a replacement board online, then magnified the photo, and looked at the color code on that same resistor in the photo. How I found the bad transistor is too complicated to explain in few words, but you can google the procedure. (You'll need a multi-meter at the very least; preferably _with_ a built in transistor checker. However, a _totally_ blown transistor can be found with only the resistance settings on a regular multi-meter).

Best of luck...

Apr 05, 2016 | Exercise & Fitness

2 Answers

Will not power on just making a high pitched humming sound


It seems that the SMPS is loaded as the driver is cut off on protection which makes the whining noise. You will need to remove the panel after disconnection of power, disconnect power to the main board and see if the +B voltage comes up on the circuit.
If so there is a short in the mainboard, can be the drivers shorting. Check with the multimeter to confirm

Apr 05, 2011 | Sansui DTV2760 27" TV

1 Answer

Hi; my friends blew the power supply board on this desk; will I be able to change individual components or have to fork out 160 euros for a new board? I think I could cope with changing components if...


It is likely one of the amps have blown as well as the power supply. The pwoer supply wipes out about $30 of components when it goes. If the fuse had been replaced after initial failure this results in more damage. For the power supply, typically the two IGBT's are wiped out and the four transistors driving them as well as the regulator chip and one or more of the gate speedup diodes which are surface mounted. Sometimes the surge limit resistors which are ceramic pacakged are blown. The hardest part is removing the heatsinks with the IGBT's on them. You DO need a desoldering station to work on this.
Usually you will find damage to the rearmost amp in the amplifier module. An arc beween layers of the multilayer circuit board causes inital failure. Three MOSFET transistors are blown and a Zener plus the board is charred and this cancer has to be ground away and re-insulated and circuit traces replaced by jumpers. Sometime the .03 ohm metering resistor on the bottom is fried... when that happens, two small surface mounted transistors are blown as well. All in all $50 of components are damaged typically.

Oct 31, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

On the circuit, one of the resistors got blown up


U can see one or two bands of the colors of the resistor right?Compare it to a couple resistors beside it or around in the board.U should know and determine it values.

May 04, 2010 | Sharp 27R-S50 27" TV

1 Answer

My magnavox projection tv has convergence problem.


there are 12 6.8 ohm 1watt resistors in your model. There could be more blown resistors as they often wont show any outward sign of being bad. It could also be the ACS board which is defective if the Resistors are good.

Apr 21, 2009 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

When i turn on the cd player the sound from the components vuts off but the sound coming through the subwoofer stays on??


The Sub gets it's output from the pre-amp circuit, whereas the components get their output from the main amp circuit in the unit.

Sounds like it could be a short in the speaker wiring or a blown speaker. Check all wiring to the speakers.

Check all speaker wires from the unit to the speakers.

First check that each pair of speaker terminals at the speaker end is not touching. Or, a wire fell of 1 terminal to rest on another.

Best way to check if it's a blown speaker or a wiring short, is to disconnect all speaker connections ( at the speaker end ) making sure the disconnected wires don't touch each other or any metal in the car. press the reset on the unit and power up. If the unit powers up ok, then its a blown speaker.

Otherwise it's a short in the wiring.

If it's a blown speaker, you can connect 1 speaker at a time and the blown 1 will send the unit into protect mode again.

If it's the wiring, disconnect the unit from the wiring and use and ohm meter to check each pair of cables. A reading suggests a short.

If you don't have an ohm meter a battery and bulb will do. This method usually works on a short.

If you have no joy with either method, take each speaker wire in turn and check with a source of earth (anything metal connected directly to the body of the car, cigar lighter main body when pulled slightly out is good)


Regards

Philip

Jul 20, 2008 | Car Audio & Video

1 Answer

Blown Channel on an amplifier


Look for low valued resistors that may look ok, but be open. Check the emitter resistors (.22 or .47 ohms). Check the transistors in the driver circuit as well.
Dan

Jun 06, 2008 | Denon AVR 3808Ci Receiver

1 Answer

Sony brick


the resistors in question are located right next to the convergence ICs. Just lift one end of the resistors out of circuit and check them for being open. The resistors will be all the same type , check all of them usually 1 or 2 of them will be open when the IC goes out.

Mar 04, 2008 | Sony KP-46WT510 46" Rear Projection HDTV

3 Answers

Need diagrams for a Vivitar 285HV Flash


I had the same problem on a new 285HV flash. I pulled it apart and found a blown resistor and track in the head of the flash.
The flash was fairly easy to pull apart, there is a clip hiding behind the blue disk, the rest is just screws.
There are 3 circuit boards, two in the base and one in the head.
The blown resister is in the head and is the large resister next to the violet wire. From the edge of the board there is R22 brown-black-brown, two diodes, another resistor yellow-violet-brown and then the one that died.
I have the service manual for the flash and it is titled 285/285HV but the circuit board in the service manual and in the flash are different.
After much studying of the circuit diagram I believe the value of the resister is 12K 2watt (90% sure, if not it is 10K 2watt).
I replaced the resistor with the 12K and was able to use the extra length of the leg of the resistor to bypass the blown track, used some heat shrink to insulate the leg from shorting out with the board.
I have tested the flash and it is working but I have not used it extensively.

Disclaimer: this board is right next to the capacitor, you don't want to touch it if it has a charge. Use a multimeter to check.

I bought the resistor from here: www.digikey.com Part No. P12KW-2BK-ND $0.206 (min order 5 still only a $1.03)

Good luck and remember I am not an electronics tech and your problem may be different to mine.

Richard

Jan 07, 2008 | Vivitar 285HV Flash

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