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My name is ***** *****, I have a Samsung HLS6767WX DLP that

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Hey my name is *****...
Hey my name is ***** *****, I have a Samsung HLS6767WX DLP that takes a few cycles to turn on, sometime 10 or more attempts over 20 minutes. While it attempts to turn on, the bulb flickers on for a second every few seconds, and the TV makes a squeel noise with a constant click/beep. I have 2 new lamps, one Phillips one a cheap knock off, both have the same issue. I've replaced the color wheel, power board (old one had no blown caps), and ballast. I've soldered the wires on the thermostat above the lamp and the blue back switch wires together to ensure they weren't bad. None of these changes the behavior.
JA: Thanks. Can you give me any more details about your issue?
Customer: All fans spin, all cables look good. The only things left to replace really are the DMD board and the main board, but I'm not sure those could affect the TV in this way. Once the TV powers up fully, there are 0 issues.
JA: OK got it. Last thing — TV Technicians generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.Category: TV
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Answered in 34 minutes by:
3/20/2016
TV Technician: Pete, Electronic Engineer replied 1 year ago
Pete
Pete, Electronic Engineer
Category: TV
Satisfied Customers: 19,005
Experience: Over 16 years of experience installing and repairing electronics.
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Hi there,

When the TV fails to turn on, do you get any blink error codes?

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Customer reply replied 1 year ago
After it tries for a minute or so it gets the standard 3 lights blinking.. timer, lamp, standby/temp
Customer reply replied 1 year ago
while trying to turn on lamp is flashing
\
TV Technician: Pete, Electronic Engineer replied 1 year ago

What colors are they blinking?

Do they blink fast or slow?

How many times do they blink?

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Customer reply replied 1 year ago
timer and lamp are green, standy/temp is red. they blink about once a second after the tv has failed to turn on, forever
Customer reply replied 1 year ago
lamp flashes green about once a second while it tries to turn on
Customer reply replied 1 year ago
This is normally a bad power board with blown caps, it's a known Samsung issue. I replaced it with a new power board, even though the old power board had no bulged capacitors, but it didn't resolve the issue.
TV Technician: Pete, Electronic Engineer replied 1 year ago

Yes, and I see you have replaced the ballast too, which is another possible cause of this blink code...

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TV Technician: Pete, Electronic Engineer replied 1 year ago

Have you measured any of the high voltages at the lamp when it tries to fire up?

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Customer reply replied 1 year ago
I have not
TV Technician: Pete, Electronic Engineer replied 1 year ago

Might be worthwhile, just to make sure power is definitely getting there.

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TV Technician: Pete, Electronic Engineer replied 1 year ago

Another possibility is if the lamp door is not correctly fitted, or if the sensor does not detect it - this will also prevent the ballast from firing power to the lamp, and cause the lamp light to blink.

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Customer reply replied 1 year ago
I've tried shorting the temp sensor and the door sensor with no change, confirmed the failure is different with them disconnected. Do you know where best to check the voltage on the ballast?
Customer reply replied 1 year ago
The lamp does fully power up once every 10s or so when the tv is trying to turn on though, it just fades out most of the time. It doesn't look any different than when the TV does actually power on, it just doesn't fade.
TV Technician: Pete, Electronic Engineer replied 1 year ago

You can also tell a lot about what is going on just by listening - when you press the power button, look and listen through the vents where the lamp door is. What do you hear when it tries to start?

Listen for the following: 1 A fan coming on. 2. The color wheel starting - a slight whining noise. 3 A buzzing sound from the ballast, around three times.

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TV Technician: Pete, Electronic Engineer replied 1 year ago

In order for the lamp to light up, these three things need to happen: the fan has run, the color wheel has to lock at a certain speed, then the ballast assembly will fire the lamp. If the color wheel has failed then the lamp will not fire up.

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TV Technician: Pete, Electronic Engineer replied 1 year ago

A faulty color wheel is a common failure in these older TV sets.

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Customer reply replied 1 year ago
Yep i can visually see the fans start to spin up, a whining and i can see the color wheel spinning, then the lamp lights up what looks like fully for a second, the it shuts off and i continue to hear everything spinning and a beep about every 1/2s. after maybe 20 is seems to 'reset' and starts the process over. after a couple failures i get the 3 flashing lights and it stops trying
Customer reply replied 1 year ago
The color wheel is new also, the old one spun fine, and the new one seems to do the same and didn't change the behavior.
Customer reply replied 1 year ago
Because the lamp is lighting up, that would mean all the steps needed are happening right (color wheel/fans/temp etc)? What would cause the lamp to light up then shut off? Voltage too low?
TV Technician: Pete, Electronic Engineer replied 1 year ago

Yes, a low voltage would cause that to happen.

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TV Technician: Pete, Electronic Engineer replied 1 year ago

I'm out of ideas at this point, so I'm going to see if the other TV experts have any additional TV input.

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Customer reply replied 1 year ago
You'd think if it was a voltage issue the TV would have trouble while on though. Once powered up, the TV has never had issues. Unless the peak draw is during power on and it's only tripped up at that point?
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Pete
Pete
Pete, Electronic Engineer
Category: TV
Satisfied Customers: 19,005
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Experience: Over 16 years of experience installing and repairing electronics.

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