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No Power light or power due to power supply blown

After dismanteling unit found a device that looks like a transistor but is on the same heat sink as a Dual Schottky Barrier Rectifier. We cannot recognize what the component is therefore we cannot locate a replacement. These devises across the secondary of a transformer. Unit is dead. We located a replacement board but is only available in the states. CCT would help.

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  • khughes163 Sep 11, 2009

    The one Device on the Heat sink is a SRF 5-04 the one we cannot recognize ends with --80-015

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

viziks
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SOURCE: BenQ FP731 17" Inverter transistors

T751,752,753,753 are the transformers to be resoldered ,and resolder Transistors Q759,60,39,40,43,51.
Please check them with a multimeter if you are adept .
Please rate the solution and provide feedback.
Samir

Posted on Apr 25, 2008

Matampong
  • 153 Answers

SOURCE: monitor fuse keeps blowing

There is definately a shorted component that causes the fuse to blow. Nomaly the ceremic capacitors are the cause of the problem. Check to see if there is visiual dark or burnt ceremic caps with label sameting like this "SCK 083" near the fuse area and change it. Hope it helps,cheers.

Posted on Jan 22, 2009

  • 4 Answers

SOURCE: I have a dead E151FP monitor...need either a schematic or another damaged monitor

You can get repair instructions for the Dell E172/E151FP at ezinearticles.com and order transistors at AnBparts on ebay.

Posted on Sep 05, 2009

  • 916 Answers

SOURCE: Screen goes black after a few seconds.

when the screen goes black shine a flashlight on it. If you see a dim image the back light needs to be replaced. Otherwise check the inverter as that may be causing the problem as well.

Posted on Sep 07, 2009

  • 13 Answers

SOURCE: Part no. for a Transistor 27611 637205

This is actually a MOSFET, not a tranny, part no 2761I, not 27611.
http://www.alldatasheet.net/view.jsp?Searchword=AP27611

Posted on Jun 13, 2010

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2 Answers

Technics su-g75 drawing/schematic? when hit power button fuse in power supply blowout.


Fuses blow when there's an overload. This is most likely caused by a semiconductor device(s) shorted. In amps this is often cuased by speaker wires that have touched while on power. The main culprits are the devices on the heat sink. If they are transistors then connecting an Ohm Meter accros the terminals of the transistor(s) (amp switched off) will show as if you have touched the test probes together! More than one device might have blown!!

Dec 23, 2014 | Technics Audio Players & Recorders

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How to find why my Pioneer SX-315 is blowing fuse 125V 8 Amp ?


Fuses blow due to an overload. Generally caused by a short circuited semi-conductor. The most likely cause in your case is something in the power amp section. Chances are something on the heat sink. The device might even have blown up! But if the amp uses transistors in that stage you can easily check these with the multi-meter. All you have to do is put the test probes on the terminals and on the Ohm setting you get a reading like you have touch the probes together - then you have found the shorted part. There might be more than one that has failed so test all the transistors. Anything connected with the power supply can cause the short. But since the biggest cause of fuse blowing in power amps is the main output stage I wouldn't bother with the power supply till you have eliminated the power amp. Failure of devices in that section is also linked to faulty speaker wiring so check that too.

Apr 28, 2014 | Audio Players & Recorders

1 Answer

Fuse


Fuses blow when there is an overload. The overload is often caused by a short-circuited semiconductor, such as a transistor. More often than not it is one or more of the main power amp devices located on a large heat-sink.

Jul 01, 2013 | Adcom GFA-5300 2-Channel Amplifier

1 Answer

Both fuses burnt and both clip and signal led on? seems to have full power behringer ep2500


Suspect an overload in either the power supply section or the devices on the main heat sink. In the power supply you are either looking at a transformer problem or semi-conductors associated with it. However since the clip and signal lights are on, I would go to the amp devices on the heat sink. If they are transistors test them with a Ohm Meter on the 1K setting in circuit even! You will soon notice which ones are gone! The meter will show like you had touch the test probes together!

May 15, 2010 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

Loud crack when turning unit on, blows main fuse no lights come on.. bottom of power supply black and signs of burn...


DO NOT REPLACE THE FUSE !!! You will do more damage.

I just repaired one of these. A small ceramic surface mounted cap very near where the +/- 85 volt connectors plug onto the board blew up.

This left a sputtered mess on the insulating material at the right rear corner of the power supply.

The net parts list of parts I had to replace:

1. Main IGBT transistors on heat sinks. You have to remove the heat sinks to get at the mounting screws. 1MBK50D or equivalent. I used DigKey part APT28GA60BD15

2. One 1N4148 surface mount diode that is for gate drive speedup. D24 and D25. (don't remember which one was shorted)

3. All four driver transistors for the gate of the IGBT's. @ each 2SA1020 (PNP) and 2SC2655 (NPN). These are tall TO92-like transistors and I believe that at least one of these I had to get from Mouser.

4. Transistor T9, suface mount BC856B (PNP)

5. Replaced all four surface mount caps, one had exploded.
C50, C51,C54,C56. Replace with 0.01mfd/200 Volt 1206 style surface mount caps Digikey 478-1511-6

6.Replaced ceramic wire wound 10 Watt stand up resistors that were blown open. Replaced with 20 ohm design change. These slowly charge the main input filter caps and when supply is stable, a relay shorts them out. If you have replaced the fuse, you LIKELY blew them out. Original value was 10 ohms on some units. This was a Mouser part. 280-PRM10-20-RC

7. The 2153 switching reg chip IC1. This chip shorts. It is made by International Rectifier and I believe the full number is something like IRF2153. I had these in stock and not sure of which source I had procured them from... It was from one or the other.

Lots of destruction and one really needs a desoldering station to work this. Removal of the blown IGBT's is especially tough. All solder must be removed from the transistor leads AND the thermistor on one of the heat sinks. Once you have verified the leads are loose, one has to rock the heat sinks to get the tabs free. The tabs are NOT soldered! Be careful when restoring to get the thermistor leads started in their holes.

Note: ALL these repair parts were procured from DigiKey.com and Mouser.com. Neither of these places had all, I had to order from both. Mouser had the ceramic resistors.

When restarting this, leave outputs disconnected until it is running again. USE a series 75 watt light bulb in the 120 volt input. ONLY work on the unit using an isolation transformer as a large portion of this is connected right to the power line.

There is a small 15 volt switching supply that comes on first that runs the relay to short out the inrush limiting resistors. With the 2153 shorted as usual, this auxilary supply can't reach voltage enough to turn on the relay. The power for this is supplied through the ceramic resistors.

May 08, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

2 Answers

The unit won't power on at all.


You can try replacing it with any 10 amp fuse just to see what happens. If a new fuse keeps blowing out then you have a shorted power amplifier inside(they consist of transistor or a single chip). These device look normal most of the time short out with any visual indication. If you desolder the power amp chips(they are mounted against an aluminum heat sink to dissipate heat) and the fuse quit blowing then it is the problem.

Aug 11, 2009 | Samsung HT-TX72 Theater System

1 Answer

PS-36KX Protection light flashing and alarm.


Check all transistors that are atached to
heat sinks , For a short between two of the
three legs. It can't be reset becuse you have
a short.



Jul 25, 2009 | Pyramid (PS36KX) 600-Watt Power Supply

1 Answer

Hi I have a kenwood Krf-v609od receiver


Hi Rodney,

Have a look at the following. 1. Check your supply to the frnt panel. You ma have some power there but also look for a Resistor that will mesure open, and look for a Reulator. This will be fitted to a heatsink, not a big one though. If there is no heatsink look for the transistor on the main heatsink starting with la78XX. The last 2 dig should give you the power it is letting through. for expl: LA7812 will be a 12V+ regulator. A LA7912 will be a 12V- regulator. If nothing is found on the front panel check for this on the main bord. Once you get this right you will see that your fron panel will switch on and the controler will also switch.

Now for your heatsink that is still warming up. Disconnect your power to the main Transistors. You can do this by desoldering all resistors that is going to all the transistors. Your supply is going hi and your transistors is getting hot.

I know all the above is much but try it.

Jun 01, 2008 | Audio Players & Recorders

3 Answers

Pioneer pdp 502mx goes to standby no picture after power on


Contact Pioneer at 1-800-421-1404 about getting an in-home power supply replacement. This is a known issue with some plasma displays. Some of you would experience a loud pop and then the power supply fails. You get a red light below the ON button, when you press on, the red light will turn green for a second and then back to red. The plasma display will not turn on after the power supply fails. Call Pioneer at 1-800-421-1404.
Brought to you by http://abstravel.com and http://reservaciones.com

May 23, 2008 | Pioneer PureVision PDP-502 50 in. Plasma...

2 Answers

Nad amp failure


Check fuses mounted near transformer . If blown check output transistor. Also check transistor transistors on small heat sink . they will cause fuse to blow.

Mar 10, 2008 | NAD C350 2-Channel Amplifier

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