Question about Mitsubishi WS-48313 48" Rear Projection HDTV-Ready Television

2 Answers

Ws-48313 no power

Will not turn on. Solid green led when plugged in otherwise no power. DM board repair not applicable, no DM board in this model. No capacitors look bad visually but have not had chance to check with cap checker. Does have 5 volt standby and the 10 volt standby line shows as 20 volts. I do have the schematic but thought somebody here might have a quick solution. Thanks

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  • 8 more comments 
  • Jeff Gordanier Sep 07, 2007

    I didn't have any voltage on pin 3 so I replaced the part. Didn't fix. Pin 1 has 20.7v, pin2 has 19.8v, pin 3 .9v, and pin 4 has 5v.

  • Jeff Gordanier Sep 07, 2007

    I traced back from pin 2 of pc9a21 and found q9a55 and d9a28 shorted. Replaced both and checked d9a29 zenier diode but did not replace.
    4.7 volts restored to pin 3 of pc9a21.
    Now power supply starts up and then shuts down after about 2 seconds. Error code flashes 22 for short circuit. What should I look for now.

    Also wanted to say how much I appreciate your help.

  • Jeff Gordanier Sep 08, 2007

    I checked both fuses and f9a05 5amp is open.
    Looking at the schematics the -24v line goes to the STK394-250 chips. Are those the convergence chips?

  • Jeff Gordanier Sep 08, 2007

    How can I tell which amp to replace? Or should I just replace both.

  • Jeff Gordanier Sep 09, 2007

    I checked all the resistors and none look smoked and using my meter they all check ok. Should I go ahead and replace them anyway? Thats a ton of 2 and 3 watt resistors.
    Also should I replace D9A61 and C9A74? They set in parallel behind the fuse that blew. I was thinking that although they test ok they might have been stressed by the current before the fuse blew. Does the convergence amps going out ever take the two coils out that feed the -24v.
    Thanks

  • Jeff Gordanier Sep 11, 2007

    I had another question. When I shine a flashlight down into the picture tubes I notice that there appears to be debris laying on the bottom of the lens. Should there be anything floating inside the coolant liquid. Can the liquid be easily replaced? If it can will the seal have to be replaced or reused? I can order the fluid from mcm electronics. If I can do this how much realignment to the tubes will be required.
    Thanks

  • Jeff Gordanier Sep 15, 2007

    Hey troylove11,

    I accidentally hit accept button on this page but tv is still broken. So I have to try and get in touch with you this way.
    I replaced the convergence chips and the resistors and then found a bad cap in the -27v line right behind the rectifier diode. Replaced diode and now -27v back but it now shuts down with a 21 error. I know this is an x-ray error but what are your thoughts on what to look at next.
    Thanks

  • Jeff Gordanier Sep 25, 2007

    I replaced the regulator and that didn't fix it. I also basically replaced all the caps in the power supply. Except the big filter caps.
    What should I look at next?

  • Jeff Gordanier Sep 25, 2007

    I now get an xray protection error. I replaced all the power supply caps just in case and I replaced the voltage regulator. Still the xray error. Any thoughts on what to look for next.

  • Jeff Gordanier Sep 28, 2007

    If the HV doesn't come up will that give a false xray protection error?
    I was trying to figure out why the HV regulator ic (mspad401) was not putting any voltage to the HOT. I traced back from pin 3(HD IN) and found that pulses were indeed coming from the deflection circuit. But they were stopping before a resistor tied to the collector side of a transistor that acts like a switch when the tv is first turned on. I checked the voltages around this transistor and checked the transistor and found no problems. I then removed the mspad401 ic and re-checked voltages and signal and the pulses have returned. So does this mean the hv driver ic is bad? Or have I missed something.

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  • 3,130 Answers

Look for swollen capacitors in the sweep power supply as well as in the main power supply. Make sure the main regulator is regulating at the proper voltage. A lot of times in these TV sets, the slight over voltage can cause the set to go into an x-ray protect mode, therefore confusing the real problem. Capacitors are very very common in the set to go bad. Good Luck

Posted on Sep 19, 2007

  • Anonymous Sep 28, 2007

    Did you get the service manual for this TV set yet? If you did, send me a copy please to [email protected]

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  • Master
  • 1,153 Answers

This model is equipped with a keyboard lock feature; this can be mistaken as a no power condition. To unlock the keyboard press and hold the "menu" button on the front panel for 10 seconds. 2. (Power LED may be on after plug in) check for no less than 4.4 volts DC at pin 3 of PC9A21 on the Power PCB, if low or missing replace PC9A21 part # 268P058020. Hope this helps if not let me know and I will go further

Posted on Sep 07, 2007

  • 1 more comment 
  • Lashawn Robinson Sep 07, 2007

    Sounds like you are on your way to fixing this set! Ok now you can check:Shutdown at power with self diagnosis error 2-2. Check for open fuses F9A04 and F9A05 part # 283P144080 on the +24 and -24 volt lines. If the fuses are open the convergence output circuit would be suspect. 2. Shutdown at power with self diagnosis error 2-1. At power on check for 12-volts DC at connector KH pin 8, if missing check IC9C51 part # 270P990010 and L9C52 part # 441D009020 on the Signal PCB.

  • Lashawn Robinson Sep 08, 2007

    You are correct! part # 283P144080 Yes and the convergence amps are probably the culprits. Remember also resistors in same area(replace)

  • Lashawn Robinson Sep 08, 2007

    Replace both to be safe, make sure you get good parts also I would go back with same maker. Also remember return resistors also in same area.

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Hi William,

If your problem is a continuous green blinking led light and will not turn on, this is an indication that the DM of your unit try but hasn't booted up and stuck to this fault.
If you have checked fine the fuses on the DM power supply board, you have to check/replaced also the electrolytic capacitors on that board.

11_1_2011_12_36_04_am.jpg

www.tvrepairkits.com has a repair kit for your unit (DM power supply board) that includes these parts.

If you've already replaced the capacitors on that board but still the symptoms still persist, I would advice you to check/replaced the capacitors on the power supply board feeding the DM power supply board. Check also the pico fuses and bad solder joints (cracked, cold, dried solder). Resolder the joints that look suspicious.
Yes, your model has no complete schematic diagram downloadable online. I have a copy of the repair manual that includes the schematic but not a complete one. The power supply's schematic shows only the major parts and the output voltages of the board. Same as on the DM's power supply.
Email me at [email protected], I will send you the copy of the repair manual.
Jdvillanueva

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Did you also replace the power capacitors on the power board. Usually the DM board and Power board caps together will cause the steady blinking led the DM caps alone only rarely cause the steady blinking led usually its a combination of both boards capoacitors failing.

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Green power light keeps blinking


hi friend,
Repairing It Yourself
If you decide to repair the TV yourself, I recommend that you obtain a copy of the repair manual for your Mitsubishi TV from the Techlore website by going to Mitsubishi Service Manual. It will provide some direction, however it is technically written and may be difficult for the NOVICE to understand. If you are unable to locate the the service manual for your specific Model at the above Techlore link, you may need to purchase the service manual online at ServiceManuals.net.
If you decide to have a service technician do the repair, insist that the "DM" module is removed from the TV and ONLY the four 1000uF, 16V Capacitors (Caps) located on the DM Module are replaced. MOST techincians will INSIST on replacing the entire DM Module and not simply the capacitors. The cost is about $200 for a technician to replace the capacitors and $1000 for replacement of the DM Module. As you will read below, doing the repair yourself will cost less than $4.00 for the 4 Caps.
A Few "Cautions"
  1. Keep yourself "grounded" when working with the circuit board. Static electricity will destroy electronic components.
  2. When replacing the Capacitors, press them "down" onto the circuit board as far as they will go, hold them down, solder into place and clip the excess terminal lengths flush with solder. Only by doing this will the metal shield (little silver box) slide down and over the circuit board during re-assembly. There is not a lot of clearance when doing this, as the 105C Capacitors are slightly longer that the originals. With minimal effort everything does fit back together.
  3. Use ONLY 105º C capacitors with a voltage rating of 35 V.
  4. Re-insert the DM circuit board into the Mother board; press virmly and ensure a proper seat of the DM board. Next, slide the metal case down and over the DM circuit board. Refer to my "Lesson Learned."
Basic Troubleshooting
  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.
hope this helps u
please rate me.....................
thank u for using fixya
regards
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