Question about Sony Grand WEGA KF-50WE620 Television

5 Answers

Sony KF-50WE620 Powers down

My Sony starts to power up; the lamp (my second) ignites (for a few seconds) and the optics block fan slowly starts up then stops and everything shuts down. It flashes red 4 times. I cleaned the two outer fans and was able to test each fan so they all work. Any assistance would be greatly appreciated.
Thanks,

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  • mafmd019993 May 27, 2009

    I would like an expert who has Sony Rear Projection TV Industry experience.

    Thank you,

  • mafmd019993 May 27, 2009

    I would like an expert with Sony Rear Projection experience; I have many questions. I will also add that the only fan that attempts to come on is the buried optics fan. To check those wires I would need to likely remove the optic block which is my last resort. This optics fan turns on at an extremely low RPM; I need total silence just to hear it turn for those few seconds. The two outer fan do not come on at all.
    Thank you,

  • mafmd019993 May 28, 2009

    Thank you,
    I already checked that switch and I'm on my second lamp which has been seated and removed a number of times.
    I will add that I do have the service manual and have run some preliminary tests. What is a bit confusing is that when the fault code flashes 4 times it's either the temperature sensor on board H3 or the Fan issue in which case it calls out testing of pins 2,5, and 8 on CN8022. I've tested pins 2,5, and 8 and they are ALL high. ??? This is why I really need someone that has industry experience with this line of Sony rear projection TVs. I expected maybe one of the pins to be high but not all three. The one thing that is also not very clear is how these fans are wired up; the fan designations are not clear; what is fan1, fan2 and fan3? I'm assuming based on some internet research that fan 1 is likely the optics fan but to be honest I just don't know.
    I do appreciate everyone's assistance but I have these questions that need to be answered. I know that it could also be an issue with the C2 board. I just don't want to do a trial and error type of troubleshooting that could cost me hundreds of dollars; the TV is a 2005.
    Help.

  • mafmd019993 May 28, 2009

    Thank you but I really would like a Sony rear projection TV Tech or Engineer.

  • mafmd019993 May 29, 2009

    The solution makes sense and he seems very knowledgeable about Sony rear projection tvs.
    Very detailed about my model Sony.

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5 Answers

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Projection TV has 3 fans,11V applied to each inividually all fans operate with external dc applied. the 4 blinks problem in tv is due to the third fan in the tv not working properly.the two fans are easily seen in the tv at its back.but the third fan which is not seen easily is the fan in the optical block.the third fan is located under the optical block assembly. The power supply board is the "G" borad which in turn sends the 11V to the "A" board. The "A" board controls the fans. Unfortunately the "A" board is tough to work on but it does have 3 ICs for fan control: Fan 1 is IC8003, Fan 2 is IC8005 and Fan 3 is IC8006.the first fan is outer fan.the second fan is the one on the lamp assembly and the third on in the optical block assembly.when you call a sony tech ,they will just replace all the three fans.and this problem of 4 blinks will get cleared.but actually this problem is only related to the third fan in optical block assebly.replacing the fan in the optical block assembly solves the issue of 4 blinks.but replacing the fan from the optical block assembly is not the easy job as replacing the other two fans.it is the toughest job to do.because to remove the fan you will have to remove the optical block assembly too.but after you remove the assembly while refitting the assembly back after replacing the fan.the optical assembly should be fitted in exact position as it was fitted before.if any difference in fitting the tv will not work properly.so its advisable that it should be done by profession tv repair person.this problem is solvable.that is sure. you can get parts at tv repair store or at  www.partstore.com thanks.please do accept the solution.keep updated.

Posted on May 28, 2009

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The lamp is not in position in your sony. it hav some loose connection so fit the lamp properly. u r says flash is in red so it may lost

Posted on May 28, 2009

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Remove and reseat the lamp. besure the lamp door is closed? check lamp door switch.

Posted on May 27, 2009

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Four blinks indicates a fan problem, i.e. no power, a loose connector or clogged fans. You need to remove the rear cover and take a look at the fan.also if its moving that does not indicates its proper.just take a look at the fan wires if the wires are bit weak the fan will start but stop in between as the weak wires will not give proper current to fan to run fluently and it will stop in between.and because the fan stops in betweeen the component to which the fan is cooling gets overheated in friction of seconds and due to that overheating the tv turns off.
this overheating and turning off is not a problem ,actually its the system.it turns off automatically because to avoid further damage,
so the fan actually needs replacement,as the new fan will come with whole new wiring.this will help.
thanks.please do raste the solution.thank you for using fixya.keep updated.

Posted on May 27, 2009

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Hi

This means there is a issue with the lamp which has gone bad or the lamp driver needs a replacement. This is a common issue with these sets, please read this link.

Please do accept this solution and revert for further assistance.

Thanks
Rylee

Posted on May 24, 2009

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