Question about Diamond Audio D5-1200.1 Car Audio Amplifier

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Diamond Audio D5 1200.1 wont power up

I received a Diamond Audio board, D5 1200.1 board. It was missing some surface mount transistors, and might be missing some other parts, I am not sure. I have compared pics of my board to other working boards and it looks the same. When the fuses are removed, there is 13.8 volts throughout the board, but when the fuses are reinserted, the voltage drops to 0.55 or so and there is a buzz from the baord. The protect lights do not come on either. I need a good pic of the board, or some help on where to start troubleshooting. Heard of this before???

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You have a dead short on the board If your missing parts I myself would not bother to fix but if your up to a callenge contact www.diamondaudio.com they can assist you in getting the parts and diagrams for you

Posted on Mar 31, 2006

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Posted on Jan 02, 2017

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Behringer EP2500 drawing large current when powered up


If you are pulling the transistor that drives the final and the problem goes away, is the driver bad? Is the power supply a multi channel isolated unit? Could the channel for that side be bad?

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1 Answer

We have a picture, but no sound. Already confirmed it is not and issue with the cable company.


If you have no audio on either the AV inputs or off-air TV channels, then it is probably in the audio output stage - the audio IC and all components in that part of the board - including surface-mounted ones - as well as dry joints/broken tracks etc. could be a possible cause. It is probably a leaky surface-mounted capacitor, transistor or diode which is preventing the audio from being produced.

This could be an expensive workshop repair, considering the cost of these parts, and the fact that SMD (surface-mount devices) are extremely tiny and difficult to replace, being soldered and glued to the PCB. This type of repair should be undertaken by a workshop - find one who give you a free quote on the likely repair cost, then you can make a decision afterwards on that basis - whether to go any further with it or not.

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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.

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The circuit board is bad on my 2175 solar welder,on the board is a number510-045-0. Where can I purchase a new board?


I find many links when I Google "solar 2175 welder parts", but don't know about NEW boards. You could get guaranteed repair of this 510-045-000 for about 84 dollars and 23 cents total. Otherwise (reading aloud & use all lower case)
Cee q Jay Jay u Nine Dash 838 At sbcglobal.net
will get you details.
Replace the off-board transistor cabled to the 3-pin connector (regardless of whether it is an MJ900 or MJ11015) at the same time with a new one in the repair kit. That's because a bad or missing off-board transistor can easily smoke a good board, specifically the surface-mount chip 723-type regulator on the solder side of the board.

Feb 17, 2010 | Welding Tools

1 Answer

Pmp3000 problem power supply.ic circuit problem.number series ic circiut..


I have a PMP5000 that I had to resurect. I had to trace out the power supply to repair it.

I can give you hint: First, a small supply runs directely from the line and generates some of the small voltages. While this starts, the main power caps are charged through limiting resistors. The main switcher is brought online and if the power amps acheive balance, then a relay connects the speakers and shorts the limiting resistors.

This is what is in the 5000 and I suspect the 3000 is similar.

In my 5000, there was arcing at one side of the power amps. The board was burned and three power fets fried. Cancer of burned board had to be carved out and traces replaced by hardwiring.
In addition, the limiting resistors were blown open, both main switching transistors were blown and 4 small driver transistors (surface mounted) and several diodes AND a switching regulator chip (surface mounted).all fried/

Hint: When restarting the unit, put a 150 watt light in series with one of side of the power input to limit the current in case you did not get all the dead bodies out.

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2 Answers

My receiver shuts off after 3 seconds.


Between the ground and the "PRD" pin of the CPU, there are three diodes: D503, D504 and D505. The first two seem to be useful to protect the CPU itself against any over-current. In case of short circuit or similar, these 2 diodes can easily blow out, and force to "0" the pin 139 voltage of the CPU ("PRD" pin, dedicated to detect any abnormal DC voltage from output transistors)
This is the reason why the protection circuit shuts-off the unit, even if the faulty power transistors have been replaced

Diodes are normal surface-mounted 1SS355: I've replaced them with two 1N4146, and everything works perfectly now.
Diodes are located in the "Function" board, at the left side of the unit: they are easily accessible

I've realized that the problems seems to be extremely common for this model, so I hope that this hint will be useful in several cases

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1 Answer

Power on but no click sound. found some transistors and resistors burn in a small board located at down side of the amp, need scematic circuit diagram to repair it. Please send.


If you have burnt the transistors that are located on the circuit board, then you wont be able to repair it I dont think because in the circuit board there are probibly mulitple layers of electrical wires the are extremely small and fine that would make it impossible to connect the transistor to the right layer. Try contacting the manufacturer though

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1 Answer

Onkyo TX-DS494 stereo receiver won't turn on.


First, check which type of protect first.

Symptoms:
3 seconds (DC protect) OR immediately shut down (Over Current protect)

How to confirm?
1.Unplug the amp.
2.Remove the metal cover.
3.You will see a long vertically installed pre-amp board mounted next to those large power transistors fixed by 12 screws on a large aluminium heat sink.
4.Remove this long vertically installed board mounted by 2 screws.
5.With 2 screws removed, just pulling this board out and hold it with one hand.
6.Plug the amp and switch it on.
7.If your amp stays ON forever, the problem is from this long board.
8.If switch off at once, the problem is from power amp board.
Try the above- mentioned steps. If DC protect, write an email to me via searching you tube SR600 capacitor replacement. Don't be afraid.
So many people wrote to me.

If over-current protect do the
following steps
(O)unplug the amp.
(1)download DS-TX494 service manual.
(2)open the amp metal cover.
(3)measure 7 large white resistors resistance loacated next to power transistors mounted on a large heat sink with black probe touching the middle pin and red probe to first/left or third/right pin.
(4)If this 3 Pins large white colour 0.22ohm x 2 resistor is open with infinity ohms ,
(5)replace it and jot down this channel for example left surround faulty. Usually only 1 channel went faulty.
(5a)When the white resistor didn't burn, "2 channels" were damaged due to bad soldering joint of the large white resistor, however.
(5b)When this happened, time taken of shut-down due to over-current is 3 seconds NOT immediately.
(6)the two large power transistors next to this white resistor 0.22 ohms x2 should also be replaced.
(7)plug the amp
(8)switch it on
(9)if ok, troubleshooting get done
(10)if not ok
(11)replace ALL the components of this power amp channel.
(12)pre-amp section no need to check.
remember if not OK, the replaced 0.22ohm x 2 resistor and 2 power transistors maybe shorted again. Check them first. If OK, replace ALL Components in this channel except 0.22 ohm x 2 and 2 transistors. 0.22 ohm x 2 means left and middle pin 0.22 ohm as well as right and middle pin also 0.22 ohm that are 2 pieces of resistors with 0.22 ohm in a large white 3 pins resistor.
Remember sometimes the
0.22 ohm white resistor is normal. If so, use a digital multimeter to measure the be bias transistor voltage via multimeter diode test function. You can compare the normal value,580mV to 650mV with faulty one,3.2mV. And the CE resistance is 1.8ohms only instead of 3 Mega ohms.

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power amp-fkn3yornxvv0r5asupq1xmgq-3-2.jpg

Jan 09, 2018 | Onkyo TX-DS494 Receiver

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