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Switch mode power supply problem, all output voltage are out of spec. 5v is 4.66v -5v same -27v is -33v -9v is 8.33v. ckd all diode & reg ic all seem ok. chopper ic is working?? hence the above o/p's can't find spec on 5mo365r ic.?? any clues thks pete

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  • Steve Rand
    Steve Rand May 11, 2010

    As far as i'm aware, that's all quite normal! PC power supplies will give very similar readings... always just a fraction off the actual voltage.



    It shouldn't be a problem, I wouldn't think... all are less than 10% from the operating ranges.



    The only thing I can see as a problem is the -9v being +8.33, but I suspect that is a typo (based on your VERY hard-to-read shorthand)



    I assume there is something wrong with your DVD player, right? Or are you just concerned about the variances?

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4 Suggested Answers

night71
  • 327 Answers

SOURCE: POWER OF 5V IS THERE, 9V IS THERE, GOES INTO PC BOARD UNDER DVD MECH.

Since I don't know what model it is, I am going for a shot in the dark. I found a place that has service manuals for Daewoo for free. If none relate to your DVD player, please give me the model number and I may find one for you.
http://www.eserviceinfo.com/repair_tips_database/Daewoo_001.html

Posted on Nov 10, 2007

SOURCE: Magnasonic DVD803-2 DVD player, stuck at standby

Hi kamil. Mo medenom, nomogom! I think problem isn't in power supply. It should be in control board (madaar-e farmaan). Hossain Shahidzadeh

Posted on Feb 24, 2008

SOURCE: Will not power up

Checa si hay filtros secos en la fuente puede ser uno de 50v a 100mf.

Posted on Mar 25, 2008

freetek
  • 5568 Answers

SOURCE: No power when plugged in. On off button stays dark, nothing works

Everyone has problems with SMPSs; mine started in 1971 when IBM was first using them; they were literally blowing up and throwing molten copper several feet.
Anyhow, if you have the benefit of a capacitance meter with DF function, check the main filter caps all of the smaller caps. The quality and durability of electrolytics is bad and getting worse and once one of these fails anywhere in a feedback path, the supply will not start. HF is hell on electrolytics.
The (ferrite) transformer in a switcher measures very low on the Ohms scale; depending on power handling and service frequency, primary <<100 Ohms, secondary from 0.? - 10 Ohms between taps, because they operate at higher frequencies. The 50 volts from the diode bridge is way too low; you probably have failed 100-200 uFd. electrolytics right close to them although this is fairly rare since they are only working with 120 Hz. From a 120 VAC line, you should have ~ 160-170 DC volts at no load if the caps are still working as they should and you have no notable resistance between the AC and the diodes.
Well-designed switchers are wonderfully efficient and very reliable if the maker didn't cheat on component quality. I've repaired literally thousands as a sideline in a now retired business and after studying them and adding a ceramic cap.or two and better quality electrolytics, they will run for decades. At one time, I had standard repair prices on ~ 70 different models.
My guarantee was 'lifetime' and that was limited only because I retired.

Posted on Aug 20, 2009

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Power supply diagram DMR-E50


If the power supply is part of the main board, then a tech needs to troubleshoot with a schematic to the component level. That is expensive. Replacing the main board is expensive. Here is the part number for the main board from Panasonics web site. Nice price!

REP3497B MAIN PCB 303.72 *

Having worked on instrumentation grade switching power supplies, I can tell which parts are the main culprits. Electrolytic capacitors ( those are the tall ones that have a polarity marking on them, diodes ( strangely enough it is often a protection diode that shorts ), regulators, and switching transistors. If it is a capacitor they will sometimes but not always leak. The fan not running usually means you have no 12VDC.

That said, I wouldn't stick my hand in there if I didn't know what the design is like. Some I have seen step the 120VAC line voltage up to +/-160V DC before dropping it down to +5V, -12V, etc.

The sad part is that these parts are usually pretty inexpensive and many are available at Radio Shack. The cost is the labor to figure it out what went wrong.

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Hello
You can bought it from most of the electronic spare part shops nearby you. Select one DC adapter which have 9V and above 2.2 Amps do not make any harm to to your set. If 9v2.2Amps is not a standard one, you can select 9V3Amps or 9V 3.5Amps and so on. As ampere rating increses the price also will increse. Be sure about its output voltage. It should be 9VDC itself. OK.

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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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1 Answer

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have you checked i f the rectifiers -diodes are stopping the minus part of the ac current,making it a dc voltage,ther either 4 single diodes or 1 round one which has 4 legs you want to measure the terminal marked with a plus sign i think,this should be a smooth dc voltage of half the input ac voltage ,in this case around 115 vdc.,it may been a power surge have you the mains suppressent capacitor,s this usually there to take the surge of 240 mains supply ,supplied by your energy company.during busy usage,there is usually a power surge ie,during tv ads,ets. is there any input /output current/voltage,to the dc transformer or out of it,have you followed the voltage/current throug the power supply circuit.

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2 Answers

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Is the fuse located before or after the main power switch?

If the answer is before the main switch, then maybe you should also check the main power switch (dirty contacts - these may cause insufficent voltages from the power supply).

Note that the (electrolytic) capacitors can be faulty but will not have visible damage, so check the DC voltages on the power supply output and try to replace the associated capacitors if the voltages seem to be too low (usually, there will be 12 and 5 volts outputs, sometimes a 3 volt output on some brands/models).

If it turns out that these voltages are not present at all, then there may be damage to the transformer driver IC (i'm assuming this is a switching power suply) - see if there is any AC voltage present at the secondary terminals of the transformer, if there is none, then the primary is most likely not being driven by the 110 V and this points to the driver IC as the possible cause. It may also be some other component in the primary section, but you said you've checked them out, so i don't know what else to suggest.

Hope you can fix it.

regards

Triarcuate

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