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How to test 5v ic regulator(3 pins)

Greetings Sir

Please help me how to test the 3 pins voltage regulator using  the VOM,i have no other spare parts to base-on..

Thank you..


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Re: how to test 5v ic regulator(3 pins)

Most chips are as follows pin 1 input voltage pin 2 common gnd pin 3 volts out ie 5vdc connect vom meter to it as follows black lead to middle pin red to pin in right if you can read the print on the chip set vom to vols dc and check it

Posted on Dec 03, 2007

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Re: how to test 5v ic regulator(3 pins)

Francis, 3 pin voltage regulators have the following;
1 pin is INPUT, let`s say 12 volts
1 pin is OUTPUT, let`s say 5 volts
1 pin is GROUND, all electronics equip. has to have a ground
the problem is they are not all wired internally the same so how do you tell which is input pin and which is output pin ? the best way to find this info is find the data sheet on-line. Google the letters NTE and click on their cross reference link and then enter the number on the front of your regulator and it will cross your device to NTE`s device and show you the info, hope this helps you, Happy Holidays BMW Rider

Posted on Dec 01, 2007

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My portable dvd player won't come on

1) you must test the charger AC for DVD PLAYER, if working try to put in another DVD player, you must use the Vom FOR to measure the output voltage dc.or replace the charger.
2) if you are using batteries change batteries, clean the contacts batteries, with contacts cleaners, retight the spring contacts batteries for a good contacts.
3) if doesnot work, the problem is the power supply the trafo, filter, diode zener, bridge diodes, IC regulator voltage. etc. go to the repair shop TV for fix it.
God bless you

Jul 16, 2012 | RCA DRC629N Portable DVD Player



Check the fuse F01. If the fuse is open change the fuse after confirming there is no other faulty component.
If fuse is OK the check C10 voltage is normal or not. If its not normal then change BD01.
If the voltage on C10 is normal the check the SMPS switching ICs IC01 and IC02. If found faulty change IC01 and IC02.
Check the current digital audio stetting is its in PCM or Bitstream . IF it's in PCM then change it to Bitstream.
If ther is no diagital audio out even after it to bitstream, check the AV receiver settings. If everything is ok there too then check the AUDIO DATA at AIC Pin 4 (for BD)or AIC3pin 13 (forDVD) using CRO. If there is no audio data the change the main PCB.
If the AUDIO DATA id ok then check DIGITAL AUDIO DATA at pin7 of AIC3 if there is no audio data then change AIC3. If its OK, Check 5V at AIC2 pin 14. If the 5V is missing check the power supply. If 5v is ok the change the main PCB.
ANALOG AUDIO MISSING........................

Electronics Equipment Repair Center

on Feb 14, 2015 | Samsung DVD & Blu-Ray Players

1 Answer

What capacitor do i need to replace the old ones in DMR-E85R to fix the problem with "please wait"

Best bet is to replace all of the electrolytic capacitors in the power supply one by one, noting original capacitance values, and voltages (capacitance values are marked in µF as well as their voltage on their jackets), uprating the value/voltage where necessary, and observing polarity (the negative pole is marked by a stripe down one side of the cap, and replacements should have this opposite the + symbol on the board) when fitting new ones in the PSU.

It may also require replacement of IC1, a 12V 5 pin IC regulator, since this may have been partially damaged by the increased output voltage of the failing electrolytic caps in close proximity to it. This device has its type number (prefixed by STR) on its face, and should be available from Panasonic. Make sure if you order a replacement, that it is for THIS MODEL only, and that it is for the power supply in this unit.

Before you go out and buy a whole bunch of new electrolytic capacitors (available from most electronics stores including Radio Shack etc), take a visual look at the power supply (unplug unit from power point, and carefully remove the power board.) Examine it carefully, and note each capacitor that you can the value/voltage of - write it down, and obtain the closest replacements of each. Don't panic if you can't get a 20V 680µF, use a 25V 1000µF instead.

The total cost depends on how many electrolytic capacitors require replacing, but it is best to replace ALL of them one by one, to ensure reliability of the circuit they are in, in this case, the power supply. Don't worry about the IC regulator or any other parts just yet, do the caps first, as these are not terribly expensive, before taking any further action.

Jun 25, 2011 | Panasonic DMR-E85H DVD Recorder

1 Answer

Hello-- I believe the remote sensor in my unit is

Remote sensors are fickle beasts; and they can develop weird characteristics in any appliance, but they seldom fail completely. It is usually the circuit behind it which can fail, in particular, the function control IC (this IC is easy to locate on the board as the sensor is directly connected within close proximity to it).

When this circuit fails or it becomes weak, the unit no longer receives the correct pulses from the remote. It can be a fiddly repair job, add the cost of parts to that list, and it becomes expensive and time-consuming. You may be able to locate a replacement IRD from an electronics store, which will fit/work like the original did - note its pin orientation and voltage rating (IRDs are voltage rated, typically around 5V), as for the function control IC, unless you note the original's part number, this could prove impossible to obtain.

My guess is that for you it is simply a faulty IRD (or IR receiver) - if you can obtain the right one for your model, it should be an easy repair. It may or may not be soldered directly to the board. Hopefully you do not need a new function control IC as well.

Fingers crossed for you on this one.

Apr 08, 2011 | JVC HR-XVC1U DVD Player/VCR

1 Answer

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...

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

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


Apr 07, 2011 | Samsung BD-P1600 Blu-ray Disc Player

1 Answer

No power.............

Hi jack,

I'm assuming that your outlet is live.

1. Check the fuse, replaced if open.

2. If the fuse blown again this is an indication of shorted parts(VDR, rectifier diode, voltage regulator IC, main filter capacitor)

3. Fuse is good - youre voltage regulator circuitry is faulty.

If you don't have necessary tools and test instrument to troubleshoot the problem click this for the replacement of the board.

Hope I helped you.

Have a nice day!

Thanks for using Fixya.

Mar 06, 2011 | Samsung BD-P1500 Blu-Ray Player

1 Answer

DMR-ES30VEB when copying VHS onto DVD, works for about 20 minutes, then whole unit suddenly shuts down, plus display goes off. Functions gradually return after about 20/30 mins. Thought it was bad discs,...

Shutdown? sounds like a power supply problem to me, and one of the likely causes would be the IC regulator (IC1) within it. The IC would have 3 to 5 pins on it, is probably marked as STRxxxxx (the x represents its type number), and probably has intermittent partial internal failure, causing the symptoms you describe. With the whole combo unplugged from the wall, remove the top cover, locate this little device, note its type/part number, find out cost of the part, replace it, observing its pin orientation on the PCB.

You might also like to check all of the electrolytic capacitors on this board too to be sure - and replace every one of them. Capacitors are one of the biggest troublemakers in any power circuit, especially electrolytic types located near components which emit heat (such as ICs and transformers). You may need to (carefully) remove the DVD drive to gain access to the power sub-board underneath. Once the sub-board is out, you can examine it more closely, and do as above. The IC regulators in this series were usually rated around 12V or so, and for the most part, were reliable. Caps are cheap enough - just note the values of the originals before buying new ones, perhaps uprate the working voltages of some to be safe. Electrolytics have a negative stripe on one side of the 'cylinder' or 'can' - so observe their polarity when replacing - the positive (+) of the cap must match the (+) point on the board.

The good news is that this may not be a really expensive repair for an otherwise functioning DVD recorder, and at this stage, is confined to one circuit. However, this is just advice from my experience. Your best option is to order the correct part number for the IC due to its voltage rating and the internal components in it. The part cost will depend on who you deal with. Don't forget to check the power sub-board for dry soldering, cracks, burn marks around components, etc. Worth saving.

Feb 18, 2011 | Panasonic DMRES30V DVD Recorder/VCR Combo

2 Answers

No power

Sounds like you have a capacitor problem.You need to open the dvd player up and check all the capacitors located on the power board.Make sure it is unplugged and be careful.There will still be some charge inside the unit.

Aug 31, 2009 | Samsung DVD-V3500 DVD Player/VCR

2 Answers

Power on but nothing else

My DVD22 did exactly the same. The solution mentioned by shelompidid not apply to me since my model already had the fix factory fitted.

The other problem mentioned on page 21 of the service manual did the trick for me, although the complaint does not seem to be directly relavant:

"Complaint: Will Not Read Disc; Other Functions May Be Disabled
See h/k service bulletins HK2004-03 and HK2005-02, as the issues covered there involve similar
Probable Cause: EC19 and EC20 (1000μf 16v capacitors) may be defective in the power supply. This can be checked by measuring the +3.3v and +5v voltages that are associated with EC19, 20 to see if they are low (more than 0.1v low). The SPMS output voltages are marked on the PCB adjacent to the large 13 pin header. While there is only one 3.3v pin, there are several +5v pins, and care should be taken to measure the correct one(s), which are either two +5v pins approximately in the center of the header.

I could actually see on the power supply board that these two caps were damaged, although they were not completely popped. An additional cap which was damaged on my board was EC4.

When I measured the voltages the middle D +5V was reading about 4,6V. I did not expect a problem until I read the statement above on page 21 stating it should not be low by more than 0,1V. My A+14 and A-14 voltages also read about +/-17 to +/-18V.

I replaced all three caps: EC4, EC19 and EC20 with 25V caps instead of 16V caps. The voltage for D +5V now read exactly 5,01V! The A+/-14 read +/-16V (some improvement).

My unit is operating fine after replacing these 3 caps! I suspect that the damage to the caps could have been spikes on the AC suppy some stage, maybe due to lightning. Pretty amazing that only the power supply have damage and not the main pcb.

May 06, 2008 | Harman Kardon DVD-22 DVD Player

1 Answer

No Power

ok! make sure ur IC regulator is good. like the 7805 or 7812 or 7809 u make sure that the following ICs are correct in voltage! 7805 is for 5V. 7812 is for 12V. 7809 is for 9V MAKE SURE THAT IS EXACTLY IN VOLTAGE!

Jun 17, 2007 | Pioneer DV-575A DVD Player

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