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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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5 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

  • 14 Answers

SOURCE: Dell 1800FP Dark, No Power but power supply seems fine. Help!

I just repaired 3 1800FP's - all dead, no lights.
Firstly a dead 2AS01 is 95% of the problem, because some fool designer left out the protective zener diode - cheapness.
Mouser Electronics does not have this part, but lists it at 37 cents in lots of 2500, and gettable at $2.66 somewhere else.
You must also replace the two small value electrolytics near this IC, as some had an ESR of 40 where <0.5 is where it should be.
I suppose as the electro's dry out, the spikes can zap the IC. The quacks on ebay flogging 2sa01's alone, probably hope to sell you another one down the track (at a fat markup).

There are 2 'Sam Young 2200uf' electros that really should be replaced, with ESR or 2-30 ! Ideally replace ALL electros, as the others will be off - but those 4 as a minimum and using a jewelers loupe, resolder other joints on the transformer and anything that looks more dull silverish, than the rest. A 1 inch used and worn paint scraper will get the case open easy.

DANGER, CAUTION : Finally when refitting the inverter board, ensure the steel tab is over the TOP middle of the board facing away from the power socket (SO YOU CAN SEE IT) . The board sides in flat. It is possible to scew the board down with a slight bend, with the tab pressing over the pcb tracks - very , very bad!

Now all I need is for some kind soul to improve the fix by stating what the value of the missing zener should be.

PS. Just because the caps are not bulging does not mean they should be OK. Most wrecked 10 year old power supplies have better ESR's, so the electronics must be hot under the cover.
I have seen bulging caps with a GOOD ESR, and non bulging ones with an ESR of 47.

Canberra

Posted on Aug 28, 2008

bob_computer
  • 3153 Answers

SOURCE: Pin Name Color Description

Yes this is a good list of the voltages to be expected from a newer power supply on just the main header

Posted on Aug 11, 2009

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Aiwa crt tv as2180nh stand by red led is on but no display


9VDC supply come from one of the LOT winding. If it should be there, the LOT should work. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. 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/

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Tip

How to measure the voltage on TV


Voltage measured on DC scale, black cable multitester / avometer put on a negative path or can be slipped on the silver wire in the tube that is not disposable wrapping.

Next, measure the voltages are available:
  • For 180v voltage can be measured on the positive pin elco (10uf/250v) in PCB RGB tube.stick pin red wire multitester
d3f355a.jpg
  • Voltage 110v for TVs 14 "-21" and 130v for 25 "-29" in the B + FlyBack Transformer (FBT), find the path there is elco 100uf/160volt. measure on a positive foot elco.
  • For 12volt voltage, please measure at the foot of the right edge of IC 7812.
534aece.jpg
  1. For voltage 5V, please measure the right foot of IC 7805.
  2. For voltage 33v, please search at the foot of VT in tuner.
  3. To measure 90v-300v, scale use DCV 250.
  4. To measure the 12v-40v, use a scale of 50 DCV
  5. To measure the voltage of 1V-9v, 10 DCV-scale use.
  6. How to measure the voltage on the yoke and in plyback is;
    • From the yoke horizontal = Fcc 110v DC, 1000 V. AC voltage can be removed with a red plug in output and in use as dB meter.
    • From the yoke pertikal 24 DC current model, except for disposable coupling C = 1 / 2 Fcc. While it could be IC 120V AC (with dB meter)
    • At Fcc FBT kolector; 110v DC, AC voltage = 1000 V..
    • At Fcc FBT filement / heater = 5V-5, 5V AC.
    • In the FBT 20-32k anode voltage V measured with 40kv HV probe is added to the multitester 1000 V. DC.
    • Voltage others depending on model and type of TV. 180v out there (for RGB) directly from the regulators, transformers, Video Amp taken from FBT.
    • There are 24V and 46v vertical FBT, also 12-18V depending on brand and type.
    • Voltage 600 V DC and focus around the screen 400v DC.

    Thus tip n trick from me (AGUS YUSTIARA ), hopefully useful.
for more info , at http://trend2download.blogspot.com


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1 Answer

How can fix a 33v tuner in the place of 5v tuner


33V is used as the tuning voltage, which has supplied to the varactor diodes inside the TV, and not is the supply voltage. The supply voltage is 5V itself, and this is a 5V tuner. The only thing to note is, whether it uses SDA - SCL or Bl -BH. This is the type.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/

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Watch out for charge voltage on big capacitors.

Rleo

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