Question about Mitsubishi WD-57733 57" HDTV

2 Answers

HDMI Inputs don't work (and I've tested my components with another TV). When viewing on Component 1 input, the picture has blotchy color, like water colors. Adjusting color and brightness doesn't help. The tint control has no effect, and in fact, the tint slide looks funny on screen. The audio control no longer allows selection of the A/V external. The only setting it allows now is TV. Reset does not change the symptoms.

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  • Norman Birt May 22, 2011

    Hi,



    Thanks for the suggestions. Do you know where I can get a schematic and component layout without spending a bunch of money? I do have electronics experience, so swapping components and replacing bad capacitors is no problem. This problem did occur right after we had a severe thunder storm and a power outage. I have the TV hooked up to a surge protector, and it was off at the time, but I guess it's possible that it still took a hit.



    Can you get me started by pointing me to the Color Oscillator location?



    Thanks,



    Norm

  • Norman Birt May 25, 2011

    Hi,



    Tried reset as suggested by jdvillanueva, problem still there.



    I am purchasing a parts and service manual to help me, but would appreciate further guidance.



    I have opened the TV, and inspected the power supply. I don't see any physical issues with respect to capacitors or other components as recommended by the other expert.



    Looking forward to your help.



    Norm

  • Norman Birt May 26, 2011

    Thanks,

    It's ok, I have the manual already. I have an o-scope and multi-meter. I've been looking at the schematics and block diagram. Seems that maybe the commonality between all the symptoms may be the Xilleron Core (IC 8001), or the Digital Video Converter (IC 7G00). I'm guessing of course, since I have problems with both the HDMI and AV audio out. I sure welcome your guidance though.

    Waiting for your next suggestion,

    Norm

  • Norman Birt May 26, 2011

    Hi, I measured voltages as follows: Connector PD Pin 10,11,12 = 12vdc. PD pins 15,16 = 18vdc. FB pin 3 = 5vdc. TA pins 40,42,44 = 5vdc. TA pins 46, 48, 50 = 9vdc. TA pin 52 = 3.3vdc. AN pin 3 = 3.3vdc. AN pin 5 = 5vdc. C8081 plus side = 1.8vdc. C8091 plus side = 2.6vdc. C8004 plus side = 1.2vdc. I think that covers all the voltages we're concerned about. I inspected the main board top side, and don't see any damage or suspicious looking parts. I'm ready for the next step. Thanks, Norm

  • Norman Birt May 27, 2011

    Hi, I did get 9vdc on TA pins 46, 48 and 50. Maybe I forgot to send you that input. So, since I have these voltages, what next?

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  • Mitsubishi Master
  • 2,098 Answers

Hi,
First lets re-initialize the AV Memories by following the steps below.
Press the front panel "Guide" and "Format" key at the same time.
Wait until the unit reboot and then try if the symptoms still there to guide you further.
Jdvillanueva

Posted on May 23, 2011

  • 1 more comment 
  • Jdvillanueva
    Jdvillanueva May 26, 2011

    Thanks for the response.



    Don't buy online for the copy of the service manual, I have a copy. Please let me know your email add and I will send it to you for free. If your handy with electronics and have necessary tools and test instrument, I will guide you fixing it yourself after you've got the copy of the service manual.

  • Jdvillanueva
    Jdvillanueva May 26, 2011

    This kind of trouble has a 50% chance fault from power supply and 50% chance fault from the parts you've mentioned.
    Let's isolate first the power supply from fault. Missing supply voltage will disable the IC's. On page 70 of the service manual shows there the supply voltage (3.3v, 2.5v, 1.8v, 1.2v) and almost same voltage on page 78. Check this voltage if present.

  • Jdvillanueva
    Jdvillanueva May 27, 2011

    Hi, nice reading but it seems your missing the 9v on TA(pin# 46,48,50). Please re-checked this voltage. On page 61 it is a supply to the IC2J01 which is also linked to IC7A01 which is processes the inputs...

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  • Master
  • 2,187 Answers

The problem may be with the color oscillator of the circuit. Check first for swollen or leaking capacitors. Capacitors are cylindrical in shape and is black in color (color may vary) and has two legs soldered to the board. It may also be a faulty board based on the number of items damaged. You would have to need special tools to have this fixed or replace the board depending on the practicality.

Posted on May 22, 2011

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