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Regulated Power supply

Replaced IC power regulator 2 times always blown out,what is the cause of this? can you help me please.

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  • iskwik Mar 15, 2008

    Sony Trinitron KVG21M2

    chassis # BG2S

    thank you for your good help maybe someday i can help you too.

  • Jaime Hernandez May 11, 2010

    Can you give us more info, model and chassis number of TV?

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  • Master
  • 2,294 Answers

If the regulator is being shorted right after you replace it, I would say that you have a polarized part that is doing that. I would suggest to check all the diodes and capacitors around the power supply circuitry, There is a posibility that T601 is shorted internally, also check IC603 for s shorted condition..
Check this picture for the power supply schematic.Regulated Power supply - d4d913d.jpg

Posted on Mar 16, 2008

  • Jaime Hernandez Mar 16, 2008

    Check Q561, Q801(H.Drive), Q802(H. Out) as well.


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Samsung tv CS-29M16MG fuse always blown


Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time.

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You certainly can replace the drive IC as mentioned above, however there may be dozens of other items that can cause the same issue. Here are some; bad regulator ICs, pull down resistors for the power supply or the drive IC, capacitors in the regulated power supply.....the list goes on and on. You most definitely must take ESD precautions(Electrostatic Discharge). Without taking these precautions, you may destroy the parts you are replacing, before you even put them in! You must be able to perform fine soldering to replace any of these parts.
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Schematic diagram example of AC DC regulated power supply 1.5volt to 35volt


You will need to add transformer and rectifier diodes before this circuit to be able to get the voltage you need.


See the link below of the regulated part of the circuit

http://simpleelectronic.com/2010/06/11/simple-adjustable-regulated-power-supply-circuit-diagram/

If you need more help let me know.

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Ive had this bluray player for 2 years and it was working fine, then one day i tried to turn it on and nothing happened. i checked if the fuse was blown but i appears to be fine. so there is no power...


hi,
there is possibility of two complaints.
1, The SMPS power supply fault
2. the mother board fault.
if the SMPS is faulty the you can rectify the problem. If it is with the mother board the you have to contact the manufacturer .
First of all you have to check the SMPS ( switch mode power supply). you have to check the voltages at it secondary stage. 5v, 12v, etc
switched-mode power supply (switching-mode power supply, SMPS, or simply switcher) is an electronic power supply that incorporates a switching regulator in order to be highly efficient in the conversion of electrical power. Like other types of power supplies, an SMPS transfers power from a source like the electrical power grid to a load (e.g., a personal computer) while converting voltage and current characteristics. An SMPS is usually employed to efficiently provide a regulated output voltage, typically at a level different from the input voltage
for checkin the SMPS voltaes you need a multimeter. And check the voltages at it secondary stage
Added the inside view of BD 1600
ajin_g_45.gif

if there is no outputs from the smps then you have to replace the SMPS drive STR ic near the big capacitor. Also ty to replace the OPTO coupler ic. y have to check the all resistors near the ic.

Remember one important thing that the capacitor can hold charge for some time even if you disconnect the power. so after removing the power. remove the SMPS very carefully. discharged the capacitor using a bulb.
i have also added a video for SMPS working for you reference will hep you for repairing your one

ok

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The easiest way to do this is to use a 3 pin regulator IC.
For a 5 volt supply go to this WEB site,
http://schematicwiring.com/simple-electronic-applications/5v-dc-regulator-with-3-pin-regulator-circuit-schematic-diagram/
For a variable voltage power supply go to this WEB site.
http://www.engineeringslash.com/power-supply/three-terminal-adjustable-regulator.html

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1 Answer

Shrinking horizontal screen image appears with black border approx 1/2" on both sides


The most likely cause is a dried up main filter capacitor. Once the effective capacitance drops low enough, 120 Hz (or 100 Hz in countries with 50 Hz power) ripple will make its way into the regulated DC supply (assuming full wave rectification).

Another likely cause of similar symptoms is a defective low voltage regulator allowing excessive ripple. The regulator IC could be bad or filter capacitor following the IC could be dried up.

The best approach to testing the capacitors is to clip a good capacitor of approximately the same uF rating and at least the same voltage rating across the suspect capacitor (with the power off). A capacitor meter can also be used but the capacitor may need to be removed from the circuit.

Once the capacitors have been confirmed to be good, voltage measurements on the regulator should be able to narrow down the problem to a bad IC or other component.

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Hi

you have bad Rectifier Diode or Ic regulator.. check first the unregulated power supply before you go to regulated power section! then check,.

Thanks!
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what you are doing is over **** for 300 mA, now if you will pulling some real wattage then you would need linear regulation.
just use a 10.00 ac adapter . or a zener diode .
the calculations in real time analysis is complex GE has the formula online . but a spike at 300ma will be assorbed by the transformer easilly. if you are protecting delicate circuit then a fuse will not work quickly enough , fry and blow is all they do.
a crowbar circuit is what most designers use nowdays.fast and efficient.
There are plenty of IC regulators on the market that will give these specs but I think your are over thinking your needs unless you have an exact spec for medical research.

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