Question about Mitsubishi WS-55511 55" Rear Projection Television

1 Answer

No reading on Horizontal Output Transistor...power supply?

After following your guidance, I found the DM Power Supply still had a green light lit up, nothing seemed blown, blackened or swollen in the DM panel. The Horizontal Output Transistor did not show any activity on the meter. Is this the part to replace, or is it the Power Supply itself, and who should I buy it from?
-Thank You

Posted by on

  • getsarge Aug 25, 2008

    I am unable to locate your original posting, do you mind reiterating what the next step is?

    Thank you,

    EC


×

1 Answer

  • 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
  • 4,234 Answers

I have provided the next step in the original posting. I'd rather kep the discussion there to maintain the context of the entire problem.

Thanks,
Dan

Posted on Aug 25, 2008

  • ABRsvcs Aug 25, 2008

    The noise you are hearing is from oone or more parts in the switch-mode power supply that are oscillating. If this is all you get when attempting to startup the set, the problem is in the power supply itself or it is a dead short further along. The power supply it trying to work and failing. The first thing to check is the horizontal output transistor. This is a 3-legged part attached to a heatsink and shouldbe close to the flyback transformer (part with large red wire coming out of the top). Check this using an ohmmeter. You should read resistance when measuring between either outer leg and the center. If any of those read zero(0) in both directions, the part is bad and should be replaced.

    Try that first. If that fails to resolve the problem, update this and we'll continue on to the next step.

    Dan


    Comment by Abrsvcs, posted on Aug 25, 2008
    Perhaps you mis-understood. Since the set is not powered up, there will be no voltage at the horizontal output transistor. You need to make the measurements I outlined above with the set unplugged.

    Second: If the power supply does not kick in at all and the transistor measures OK, then we need to look at the power supply area itself. Close to the area where the AC cord connects to the board you should see some capacitors that have a value in the 2.2-4.7ufd range with a working voltage of 200V or more. Try replacing those caps and report your results here.

    Dan

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

I have a mitsubishi 60inch model # vs 60609. the green light comes on as you turn it on but no sound or picture any ideas on what could be wrong? please help


You will need to replace IC8c00 (STK 393-110) . This is your convergence IC. You will need to measure all of the 6.8 ohm resistors, replace as necessary. These resistors will have blue,gray and gold stripes, there may be sixteen of these. Expect to replace at least three of these if not more. Replace caps C8c05 (25 volts at 100Mf),C8c07 (25 volts at 100Mf). Other caps to replace are C2c86 (25 volt at 10Mf),C2V17 (25 volt at 10 MF) and C601 (350 volt at 1 Mf). you will also need a keen eye to resolder connections behind tuner TU1A02 (says RF). Jumper sockets CE,RG,DM,VU,DP,EL. Check and resolder socket connections KC,KB,AV1,AV2 and resolder IC 2p30. And you will also need to pull the power supply board, resolder jumper connections CE, RG, DM, VU, DP, and EL. Resolder the vertical IC , this IC will be of the LA78XX series,(do not use excess solder and short the pins). Resolder the horizontal transformer, and the flyback transformer. You will need a keen eye to visually inspect bad grounds on power resistors,horizontal transistor, horizontal output transistor any any and all regulator transistors located on heat sinks. This may seem complicated, time and patience will repair this. Spend an hour a day for two weeks to fix this. Thanks for asking and show all hands of support!

Jun 01, 2011 | Mitsubishi VS-60609 60" Rear Projection...

3 Answers

Do not power on


Can you please inform us the model and brand of this unit..if the unit wont power on this can be a problem with the power supply or the power adapter ...

Aug 26, 2008 | Projection Televisions

8 Answers

Mitsubishi WS-55511 - No Power - No Blinking Light


This can be a problem with the powersupply of the television that's why you hear a high frequency noise and there's no power or any light coming on , the power supply may gone bad and needs replacement..

Good luck.......

Aug 19, 2008 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

I have a Mitsubishi WD-62525 HDTV that suddenly wont turn on. Just has a green blinking light when you hit the power button. Any ideas?


I found this on another website, most likely it is your power supply capacitors.
  1. Press the "reset" button and hold for 10 seconds .... Does TV turn on and blinking green light turn to solid green.

  2. Unplug the TV from it's power source for various times, ranging between 5 minutes and 24 hours..... Does blinking green light continue upon plugging in the TV.

  3. Disconnect ALL devices from the TV; DVD, Tuner, Cable Box, unplug the TV for various duration times .... Does blinking green light continues upon plugging in the TV.

  4. Press Power and Menu buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.

  5. Press Power and Display buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.

  6. Insure that no front panel buttons are inadvertently stuck in an "engaged" position.

Diagnosis: If none of the above test resolve the issue, then the failure lies in one of the following:

  1. DM Module Capacitors have FAILED.
  2. DM Module is defective.
  3. EEPROM Board failure
  4. Power Supply failure.

Feb 28, 2011 | Mitsubishi WD-62525 62" Rear Projection...

1 Answer

Green blinking light following a power outage


I rebuild the DM power supply in these sets with about a 50% success rate. Sometimes changing the 7 1000uf caps on the small power supply in the DM will fix it, you'll also have to solder the small 8 pin ICs as well. Do this carefully as you do not want an accidental bridge. If this does not fix your problem, replace the DM-POWER board not the DM Assembly. It's about a 300 dollar difference. You'll need a mitsubishi authorized service center to order the part for you. Goodluck.

Jul 05, 2010 | Mitsubishi WS-65869 65" Rear Projection...

2 Answers

Push power button and lold it in green light blinks one time and then nine times fast and then cuts off light try a few seconds later and green light comes on for a few seconds and off it does this three...


Hi:

You are in HV shutdown mode, Have the Horizontal output transistor replaced as well as the Horizontal output transformer. These are the most common failure for this problem, The three blinks indicates Delfection problem, and these parts are part of the main High Voltage Deflection circuits.

Dec 27, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

SONY KP-61V90 tv will not power on, red light in front,


Its 2 times blink error code that shows +B volt supply (+135 volts) is shorted, most probably horizontal output transistor is shorted, replace it.
If you are good in soldering parts in circuit board then take out horizontal transistor, check it, found shorted then replace it with same number.

Horizontal output Transistor Q502 number is 2SD2578 and available in Part Store for $10
Let me know for further query, if any.
Thanks.

Nov 18, 2009 | Sony Projection Televisions

1 Answer

When turned on will not show picture or make any sounds but makes a uzzing noise


The set has developed a short and the power supply is buzzing because of the overload. I would start by checking the horizontal output transistor and its related components. It could also be the source diode for the horizontal output transistor that is found in the power supply. Do some checking and get back to me on this. Thanks for using fixya. Be carefull and unplug before attempting. This is a high voltage circuit.

Nov 05, 2009 | Philips 60PP9363 60" Rear Projection...

1 Answer

The +[-] 120v (Green light) does not come on at all. The power indicator red light comes on and then goes out in the front, then all the green lights in the back goes out , the only light on is the the...


You most likely have an open fuse on the power supply in the 120v line. That means in most cases your horizontal output transistor is shorted. If it is look around the transistor itself and look for any ceramic disc capacitors that may be cracked or split. If I remember correctly I had a few of those models where I think it was C777 that was basically arcing which opened up the fuse and or shorted the transistor too.

Oct 17, 2009 | Hitachi 50UX58K 50" Rear Projection...

2 Answers

No picture


I disagree with given info, this tv has no horizontal output transistor because it is dlp tv.
3 red light blink means lamp cover is not placed back properly after lamp replacement/ lamp checking. Make sure lamp cover is fixed back in its place securely and tight.


Jul 16, 2009 | Sony Grand WEGA KF42WE610 42" Rear...

Not finding what you are looking for?
Mitsubishi WS-55511 55" Rear Projection Television Logo

Related Topics:

70 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mitsubishi Projection Televisions Experts

matt martin
matt martin

Level 3 Expert

1191 Answers

Jaime Hernandez

Level 3 Expert

2267 Answers

The Knight
The Knight

Level 3 Expert

68323 Answers

Are you a Mitsubishi Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...