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Samsung HLS5687WX/XXA

Posted: Fri Apr 15, 2016 12:26 am
by mike56dlp
My Samsung HLS5687WX/XXA stopped working recently. Once pressing the power button, the lamp in the back turns on and warms up slowly to full brightness. The TV makes almost no other noises. The lamp light on the front blinks. The TV does not play its jingle and no picture ever shows. It stays like this for a minute or so, then returns to standby. I can see the little fan spinning, but the larger fan is obscured from view. I have tried jumping the thermal sensor and door sensor but the behavior remains the same.



I've had the TV since new, so its almost 10 years old. I haven't replaced a single thing.



I do not see any bulging capacitors on the power supply board. I removed the color wheel and it spins for a long time when I push it, but does make a very faint - very very faint - ch ch ch sound like when your brakes are dragging on a car. The TV powers itself on when I insert the power cord (well, it does the above procedure).



What new parts should I invest in? I really want to fix this... but I need to be fairly certain before spending money. My wife is hoping that its dead and wants a new thin LED tv instead! Please help me save my DLP! Thank you!

Re: Samsung HLS5687WX/XXA

Posted: Fri Apr 15, 2016 11:05 pm
by ChubbsTech
Hello,



mike56dlp,



Ten years is a long time for a DLP to continuously work without issues. The bulb obviously will eventually need replacing and if you haven't replaced it before I would start there since for the most part it's usually always the first part to need replacing. There are a couple other components that are consumable like the lamp. Those will eventually need replacing as well. The ballast and color wheel are these other parts. Try the l;amp first hopefully that will be all it would need for now. Let us know how it goes.



Regards,

Re: Samsung HLS5687WX/XXA

Posted: Tue Apr 26, 2016 1:47 am
by mike56dlp
Well, its not the lamp. I put a new bulb assembly in today and noticed a slight change. The unit no longer powers up when the power cord is inserted. Second, after a few minutes the lamp light stops flashing. No lights are on for another minute or two, then it returns to standby. The new lamp lights up just like the old one did and is visible through the rear of the unit.



So, what's next? Ballast or color wheel?

Re: Samsung HLS5687WX/XXA

Posted: Thu Apr 28, 2016 11:05 pm
by ChubbsTech
Hello,



The ballast usually goes out before the color wheel although not always. You mention a sound similar to brakes dragging on a car. This could be the bearings in the color wheel starting to go bad and not allowing the wheel to spin freely and at the speed it's supposed to. The system will detect if the wheel is not spinning at the proper speed and if so it will not power up. I think you would need to confirm exactly where that sound is coming from. Ballasts will also make a sound when failing but this sound is more of an electrical buzzing sound. If you're getting a mechanical type sound it would be colorwheel electrical would be the ballast.



Regards,

Re: Samsung HLS5687WX/XXA

Posted: Sun Jun 05, 2016 8:34 pm
by mike56dlp
Updates:



No change with the new lamp.



I read 312V at the connector from the power supply to the ballast. A little low, i guess, since most of what I read says it should be 380V.



I blew up a harbor freight volt meter sampling the high-v leads to the lamp. I expected it to blow a fuse, whoops, but instead let all of the magic smoke out.



I bridged the two pins on the middle transistor on the ballast board to force it on. I found instructions to do this. No real change... when I plugged it in the set powered itself on, which it had done occasionally before the lamp replacement. The lamp lights, and slowly warms up, but it did this before I bridged the pins.



I powered the set on without the lamp installed. I could see the color wheel spinning. When the set turns off, the wheel spins down, and based on this experiment I was able to confirm one of the sounds the TV makes is the color wheel spinning.





So, questions.

If the ballast is bad, why would the lamp light?

Since bridging the pins forcing the ballast on made no change, does this confirm its a bad ballast?

What else could be wrong, because I am conflicted on the above two statements.



Thanks again!!

Re: Samsung HLS5687WX/XXA

Posted: Mon Jul 04, 2016 2:50 am
by appleads
I'd go for a new color wheel. Insufficient speed will stop the start up process quickly. Buy only a new color wheel, and take your time installing it. Slow and gentle is my rule. 10 years is a long time for all the consumable parts of this tv, but since your lamp is lighting up, I would give the ballast and lamp a pass and suspect 1. fans (are they spotless?) 2. general cleanliness (vacuum/blow out/feather dust everything you can reach) OR 3. the color wheel. My money is on the color wheel being bad. Let us know how it turns out.