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Wd 57734, error code 66. recently replaced the lamp. worked…

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wd 57734, error code 66...
wd 57734, error code 66. recently replaced the lamp. worked fine for about two months. now, when i turn it on, i can hear a high pitch "whine,' reaches a crescendo then "whines" down, does this about three times before the tv shuts itself off...
Submitted: 2 years ago.Category: TV
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1/19/2016
TV Technician: Steve G., Technician replied 2 years ago
Steve G.
Steve G., Technician
Category: TV
Satisfied Customers: 17,987
Experience: VP of electronic repair company. Audio nut.
Verified

Hello there and welcome to Just Answer. My name is ***** ***** I will be assisting you today. I am an engineer with over 30 years of electrical and electronic training, repair and installation experience. I will try and answer your question accurately and precisely so that we can get you on your way.

Just so I understand, are you getting the 66 code now? I'm unclear.

Thanks.

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TV Technician: Steve G., Technician replied 2 years ago

Ok, that could be a bad ballast however if you are hearing an audible whine, that may be indicative of bad bearings in the color wheel. And, if that wheel does not spin up to the specified RPMs, the ballast will not fire the lamp.

Has the color wheel ever been replaced?

Let me know.

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Customer reply replied 2 years ago
the wheel has never been replaced. ive read some online that suggests this, the ballast, and/or the fan... is there some troubleshooting that i could do in order to better determine which it actually is?
TV Technician: Steve G., Technician replied 2 years ago

The fans are not going to be loud. The color wheel spins up to 9000RPM and can sound like a siren in some situations.

So with that info, does it sound like the wheel or a fan?

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Customer reply replied 2 years ago
probably not a fan, unless the whining is friction from the fan.... how could we test the ballast?
Customer reply replied 2 years ago
also read online that "cleaning" the inside of the tv is a good idea?
TV Technician: Steve G., Technician replied 2 years ago

If you have a meter, we can check out the ballast.

Do you have one?

If so, we first need to check the high voltage connection to the board.

Hold on while I get that info.

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TV Technician: Steve G., Technician replied 2 years ago

Ok, on the ballast you should have two connectors: CJ1 and CJ3.

You should have 340V DC across pins 1 and 3 of CJ3.

Let's check that first.

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Customer reply replied 2 years ago
ok, ill have to wait until i get home to check....
Customer reply replied 2 years ago
what does the ballast even look like, ive never opened the tv up...just replaced the lamp....
Customer reply replied 2 years ago
im at work, sometimes these answers take time.... lets say this voltage is correct, what else could i do?
TV Technician: Steve G., Technician replied 2 years ago

The voltage should always be present. The ballast is then triggered by 5V coming in on pin 3 of CJ3.

Having said all that, when the ballast strikes, there is a 'spark gap' on the ballast board and you should observe a visible 'flash'. Check that first. If there is a flash and the lamp doesn't strike, then it is your lamp - which is usually a 66 code anyway.

The ballast is located in the actual light engine adjacent the lamp.

I'll be here.

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TV Technician: Steve G., Technician replied 2 years ago

Hi, did we try to observe the spark gap?

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Customer reply replied 2 years ago
I'd only taken the back off. How much more do I need to remove in order to see this spark? The whine seems to be coming from a circular, spinning object right behind the bulb housing... can't be 100% sure without getting an "overhead" view...
Customer reply replied 2 years ago
I couldn't see where cj3 or cj1 was...
Customer reply replied 2 years ago
Will you be available after five est? I'll be at work until then...
TV Technician: Steve G., Technician replied 2 years ago

Yes. I will be available after 6EST.

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Customer reply replied 2 years ago
Are you around?
TV Technician: Steve G., Technician replied 2 years ago

Ok, I'm here. Sorry, the snow has me outside shovelling :)

I'm in for the night now.

So where did we get to? Have you identified the ballast?

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Customer reply replied 2 years ago
I haven't yet
TV Technician: Steve G., Technician replied 2 years ago

Ok, let me see if I can find a photo.

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TV Technician: Steve G., Technician replied 2 years ago

Ok, I found a video fo a V39 chassis which was the one after yours. The ballast is in the same spot. https://www.youtube.com/watch?v=y0arweAWnjE

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TV Technician: Steve G., Technician replied 2 years ago

Ok, the black and yellow wires are your 300+ VDC coming in. Set your meter to DC and measure that. You will need to turn on the TV.

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Customer reply replied 2 years ago
Don't I have to expose the wires, slightly?
TV Technician: Steve G., Technician replied 2 years ago

No. You stick the probes down through the top of the connector.

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TV Technician: Steve G., Technician replied 2 years ago

I'm not a big fan of those meters/testers but you would be looking for about 300V DC across the black and yellow. Can you get hold of a meter that measures voltage and displays it on a digital readout? A multimeter in other words.

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Customer reply replied 2 years ago
Ha! I asked my friend for a multimeter and that is what he gave me to use. I thought it looked funny... I'll have to find one... thanks, ***** ***** gonna be tomorrow. When do you think you'll be available?
TV Technician: Steve G., Technician replied 2 years ago

I'm emailed when you reply and try to get to a PC as soon as poss.

I'll be around for the remainder of the week.

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TV Technician: Steve G., Technician replied 2 years ago

Yes. That is perfrect. Home Depot and Lowes have meters under $30.

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Customer reply replied 2 years ago
There 334v going to cj3...
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
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