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Mits WT42413. No power on. Before the green light would come on. Any ideas? Thanks

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  • tnasah May 11, 2010

    I have done that step. I get pwr to the board. What next?

  • tnasah May 11, 2010

    Thank you. Tried the procedure and I got a 1,2 sequence. What could be the issue since this sequence means no error?

  • tnasah May 13, 2010

    No sign of Glycol. I do have the schematic so I guess I will just go the old fashion way before I part it out. The tubes look pristine.

  • tnasah May 13, 2010

    Thanks. I am very versed in circuit trouble shooting. I will give this a crack and let you know. spiscean on y!

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  • Televison & ... Master
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UNPLUG TV AND THEN PLUG BACK IN---TURN ON---GREEN POWER LIGHT COMES ON FOR A MOMENT AND GOES OFF.

PRESS AND HOLD “device” and “menu” buttons on front of tv for at least 5 seconds and then release both together.


Watch for power light to blink in a sequence:

1 blink-then 2 blinks-------no error

2 blink-then 1 blink-------X-ray protection

2 blink-then 2 blink-------SHORT PROTECTION*******

2 blink-then 3 blink---------deflection circuit problem

2 blink-then 4 blink---------vertical circuit problem


******2, then 2 is most common---usually means one of the fuses that protect the Convergence IC or IC’s is blown---set will detect no voltage to convergence IC and shut down.


SET WILL REPEAT BLINK ERROR CODE UP TO 5 TIMES AND THEN TO GET IT TO REPEAT MORE YOU HAVE TO UNPLUG SET AND TRY TO TURN ON AGAIN.


IF IT IS 2 AND THEN 2---USUALLY
CONVERGENCE CIRCUIT PROBLEM

Let me know what you find as I am familiar with this set.

SD TECH

Posted on May 11, 2010

  • SD Tech
    SD Tech May 12, 2010

    unplug the set and try it again---with "no error" it means something outside of the shutdown is wrong and someone would have to have a schematic and start tracing voltages from the power supply to various other parts of the set.

    I would also suggest you take a good look for any signs of Glycol having leaked out.


  • SD Tech
    SD Tech May 13, 2010

    There are some logical things to do here. This set has a light box and you can remove it intact and use the Mitsubishi remote to turn it one etc.

    If you do not know how to do this I can tell you.

    With it out I would try to confirm if certain voltages in the power supply come up and then instantly go down--shutdown will kill them almost instantly.

    The large board on the right (viewed from the back) is the power supply and High voltage board. I have seen a few of these with a shorted cap near the HV output transistor. Be aware the set uses two different grounds--when measuring in the power supply you have to be on the correct one to get correct readings.

    With the light box out you can tilt it and lay it face down so all the boards face the back towards you. I would begin by taking a very good look for any cracked or bad solder connections at plugs or certain parts on the boards. Next you begin by getting a meter in position and using the remote turn the set on(remote receiver is on tiny board at top by the middle lens).

    Let me know and do not give up as in truth it could be a minor part bad and the hard part is to find it.

    Look for voltages that do not come up at all etc. If no error detected something is open... A open will be harder to find as it does not create an error code. A shorted part etc will leave a error code or create one.


    Let me know and know I am willing to help as much as possible.

    I have been on this site for close to two years with nearly 2,000 problems solved with a 97% approval rating.

    I have from time to time bent the rules to help people, I have a Yahoo IM and if you provide one we can talk while you attempt to find the problem. I am in California and here from about 5 - 9 every evening.


    SD TECH


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  • Master
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Hello,

once any electronics refuses to turn on, such situation is known to be a power problem. In order to solve such problem, those things that are associated to powering the electronic device needs to be checked, starting from the power outlet to the components on the power panel.

First, you need to check if power is entering into the TV, after that, check the power board of the TV. There you will find, capacitors, fuses, transformer, etc.. If any of these power components are bad, there is no way the TV will turn on.

Therefore you need to diagnose the power board of the TV, test its components with meter to detect if any of the components are bad. After the diagnoses, you will discover what went wrong and you can proffer a solution by replacing the bad component.

You need to have a technical ability before you can do what I suggested above. Also, before you attempt opening the TV, allow it to cool, because TV stores current.

Good luck.

Posted on May 10, 2010

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