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I bought a Vizio model VF550H 55"LCDHDTV120h from ebay. It worked great the first 6 hours then it started powering off every 30-60 minutes. It will not power on immediately, could take up to 1 hour to power on again.

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  • Donald DCruz
    Donald DCruz Jul 04, 2010

    Since it is a new purchase , you must be having a warranty on the machine and hence do not attempt to do anything so as to cancel the warranty. I suspect that it is apoweer related fault and could be expensive, hence call up and fiile a complaint immediately. Good day

  • nc_cif Jul 05, 2010

    No, I have stated very clearly that I bought this tv from Ebay. If it was a purchase with a warranty, I am not so dump not to know that. I have also stated that the problem is power related unless you ddi not care to read or understand the problem. It is powering off after about one hour of clear pictures. It will not power on for a long time. Sometimes it's taking over one hour to power on and when it does, the previous channel comes on. So the problem is power related!!. I paid you to resolve a power relate problem. I did not pay you to tell me that the tv is powering off because of a power related problem. That i already know!! So can you solve the problem as you promised in your advertisement or can I have my money back, please?

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Sorry, I am trying to help but with the clarification.Knowing that you are aware of the fault I would suggest that you strt your check from the area of the Power driver, Switch mode transformer and the Main capacitor.Please check on the +B at the time of power off. If the main voltage stays and if the sub supply votage to the processor also is in the standby mode, then you will have to check on the timer cut off output from the processor. Assuming that you have not set up the delay timer off , you will have to check for the switch on/off trigger from the processor. Another component that could be erratic could be the the optocoupler that switches the SMPS. If you can test the voltage on switch off , it would be confirmed. Please check these voltages , look out for any heating components that could detach on heating and on cooling resume the connection, this could be the wire wound resistors, coils or the power drive transistors/ diode. Please smell for any such heating but please do it with caution when the power is connected.
I am sure you understand that that could be several related component weakning in this complaint which will require a through voltage test analysis when the set comes to the fault. So make a note of the voltages during the working condition and do the same during the failure time, make this note and check the area relted to the switch-on/ off that is the trigger from the processor/ the optocoupler/ the feedback from the error amps.Another way to get this culprit is to use a freezing spray on the suspected area which is showing a thermal runaway. If on cooling the set jumps back to power(do this spray only with power off) Probe on to get the defective component... check onthe electrolitic capacitors in this area.
I have responded only thinking that an inexperienced check could sometimes prove expensive. So it is only an advise to go about. I hope you will take this test with caution.Good Luck. Good day

Posted on Jul 06, 2010

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