Question about Philips MCD139 System

4 Answers

Hi, The system doesn't power up. I have removed the power board from the speaker unit but, I do not have the 23v. I have the 5v. I have mains to the Bridge and then 300 vdc out and across Pin 6 on T901. Nothing across 7 &13. Can you help

Posted by on

  • 3 more comments 
  • darren_cook8 Oct 01, 2010

    Hi, this isn't $6 worth of advice. As you can see from my question I have already gone further than your answer. I am an Electronics Engineer and I am trying to fix this without diagrams. I assumed you were knowledgable with this system and you could give me voltage readings at specific points. Where do we go know?

  • darren_cook8 Oct 04, 2010

    Hi, As I said in the question I have 240vac input to the bridge rectifier and I have what appears to be 380vdc out. It then looks to go to one half of the prinary windins of the transformer Pin 4 and 6. Pin4 looks to go to the control IC901, pin6 is straight from the bridge.. The secondary winding Pin 7 &13 should produce a voltage a little above the +23v that should be present at connector CN902. CN 902 supplies the Amp board with +5.5v and +23v. I do not have +23v.



    Darren

  • darren_cook8 Oct 04, 2010

    No, I received the system faulty.

  • darren_cook8 Oct 04, 2010

    The intial question was to help me determine which component has failed. It sounds like you do not have access to diagrams on this particular board either?

  • darren_cook8 Oct 04, 2010

    Two experts have failed to advise me with this problem. I have provided more information in my question than in any of the 4 answers they have provided. Can any one help me?

×

Ad

4 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Philips Master
  • 5,807 Answers

Thanks for choosing Fixya for assistance,


here is the initial solution for you :


Hi, The system doesn't power up. I have removed - cf30d24.jpg



Disconnect the coil ( in yellow circle ) , just to determine if it is from the load

or from the diode or capacitor


I will post for more should you need further assistance

Posted on Oct 06, 2010

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 3,083 Answers

If you've removed the load to the transformer, you should see something on the output pins, which I assume are 7 & 13. The transformer could have a bad output winding. Are you getting continuity at all (for the windings) on 7 & 13?
If not, or if less than expected, the transformer could be bad.
Tried to run down a schematic, but couldn't find a service manual on the net.
I'd suspect the transformer- could be shorted, or open.
Good luck, and hope this helps

Posted on Oct 04, 2010

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Philips Master
  • 6,993 Answers

Hello,

get a meter, use it to read the components on the power board, such as capacitor, diode, etc. Detect the bad component make necessary replacement and the system should power up again.

The system is having a power problem, and a meter is needed so that you can detect the fault by reading the power board.

Good luck.

Posted on Oct 01, 2010

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,777 Answers

It sounds like the board has problems for sure, what exactly are you looking for as far as for help? I may be able to help you find a replacement board, but for this unit it will be difficult. You will be better off getting a "broken" one of these units and pulling the board from that or just replacing the unit outright.
Give me more specifics here and I can help for sure.
Thanks Tim

Posted on Oct 02, 2010

  • 1 more comment 
  • Tim Grayson
    Tim Grayson Oct 04, 2010

    Ok it sounds like either the power supply of the system is having issues or your converter is not working correctly... have you ever had it successfully working with this converter you are using?

    Thanks
    Tim

  • Tim Grayson
    Tim Grayson Oct 04, 2010

    Oh ok, well it sounds like power board / power supply problems. Are you going to try and replace the supply?

    Thanks
    Tim

  • Tim Grayson
    Tim Grayson Oct 04, 2010

    Only Philips has schematics for this device. I have worked on repairing them many times, but without having your device in hand it is impossible to know for certain which piece it is, but it sounds like a power supply issue if the boards look ok and you aren't getting proper voltage.

    Thanks
    Tim

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

No power


You need to remove top and check for 12v and 5v,( put multimeter leads on wires one at a time) going into display panel from main board. If you see 12v and 5v than display board is very bad.If no voltage at all then main b. is bad or the noise filter( connects to power cord) fuse is bad.

Apr 06, 2014 | LG Washing Machines

2 Answers

Polaroid FLM-3701 power


Unfortunately modern televisions and monitors are full of electronic semiconductors of which many are likely have got destroyed along with your original power supply during the storm. A nearby lightning strike will send high voltage spikes down aerial cables as well as through socket outlets.
If you have contents insurance you should be able to claim for a new monitor.

Nov 09, 2013 | Polaroid FLM-3701 Television

2 Answers

Vizio VT470M no picture, no sound, no backlight. Power supply board looks good all voltages appear correct (24V, 5V, and 3.7V) and no "bulged" capacitors . When I unplug unit for two hours, the...


Im having similar problem and with my limited knowledge of lcd tvs and the voltages ALL being good except the pwr on or sw on voltage from the main board to the power supply which tells it to switch everything on Im guessing that something is going wrong on the main board. In the condition where it freezes it (the power on V) which switches everything on i get varied voltages such as 2.5 or 3 or (the normal 5v) and then when nothing powers up (blank screen) i read 0v on pwr on voltage but all my other voltages are corect (24v to inverter, 12 v to main board, 5v, etc.) Im guessing from researching this is that there is in improper voltage somewhere in the main board circuit. I have been unable to find it so i may order another board and post back.

Jun 19, 2012 | Vizio VT470M 47 in. TV

1 Answer

Fault TV


that is main board issue..

Jun 14, 2012 | Televison & Video

1 Answer

My tv is plugged in but wont turn on, there is a green flashing light (timer) how do i fix this?


hi sir good day the green light indicator flashing which indicates error detected by processor. now here is my solution on how will you fix the problem. if you are going to do it with your make sure you have proper tools and at least a basic knowledge in repairing. now unplugged the unit then open the back cover to gain access the internal part of the tv. now disconnect the connector wire going to inverter board for back light then turn the tv, if the indicator stays green doesn't blink then all the voltage out put from the power supply is normal the 5v stand by,5v switch, 12v and 24v are present, you have bad inverter board or the back light itself. another way is if you disconnect the connector wire going to inverter ballast board then still light indicator flashing and no PS_ON voltage coming from the main board which switch the power supply to turn on i may say you have bad processor board. make sure no bulging capacitors at the power supply replaced it with the same value a panasonic brand FM or FC series much better with low ESR 105c rating. you can find replacement parts at www.digikey.com . hope this will help you feel free to ask further question good luck.

Aug 20, 2011 | Televison & Video

1 Answer

The system worked fine but has an intermittent connection in the main power tower unit..you can shake the unit or bump it heavily and the sound from the main tower speakers goes and comes with a lot of...


They are prone to bad solder connections on the power regulators and output ics. should only be a labor charge. est $60 -100

Not very easy to take apart, need to remove several screws on rear of unit, remove front grill remove some screws on front. disconect connectors remove amp and power supply board, resolder bad connections and re-assemble. I've done several would take me 30-45 min.

Nov 12, 2009 | Sony SA-VA1 Rear Speaker

1 Answer

Brother MFC 640 printer/all-in-one power supply dead


Hi Ben. I just posted a similar problem. Are you sure it's the Power Supply though?. The one in my unit is fine, as are the low voltage supplies on the main PCB. (5V and 3.3V). The problem is the biggest IC on the main board getting hot.

Jul 11, 2009 | Brother Office Equipment & Supplies

1 Answer

Polaroid " 3211 TLXB red light no power up?Ive checked for Bad Caps,on the main power supply.I found none,that were swollen or leaking.It looks good.I checked volltage out to volltage inverter.all the out...


hi remove the supply to the main board & inverter, now power your psu if give you this same above voltages , go for new power supply unit. change your power

Oct 12, 2008 | Polaroid 3211TLXB 32 in. LCD Television

2 Answers

Will not stay on


RED light is protect circuit = do not disable !
Look for C702 near flyback transformer - might be hidden in
glue = check it = if shorted, replace 102K / 2KV with 3KV =
Sony part # 1-161-754-00 and replace E994 pico fuse.....T.

Nov 08, 2007 | Hitachi 60UX54B/55K 60" Rear Projection...

Not finding what you are looking for?
Philips MCD139 System Logo

Related Topics:

258 people viewed this question

Ask a Question

Usually answered in minutes!

Top Philips Audio Players & Recorders Experts

Gyula Lacz

Level 3 Expert

484 Answers

kakima

Level 3 Expert

102366 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Are you a Philips Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...