Samsung HLT-5687 still cycling on/off at power-up, AFTER both power supplies replaced
If anyone here can help shed some light on the following problem, I’d be very grateful.
I have a 56-inch Samsung DLP model HLT-5687, and recently it began exhibiting a symptom where after turning it on, it would immediately "click" off and then on again, and do that numerous times before finally deciding to stay on for good. When the problem first began it would power cycle like this this once or twice, but now it’s up to a dozen or more times before it settles down.
Reports of this sort of power cycling problem are strewn all over the Internet, and my research indicated that my symptoms were most likely due to the well-known “defective capacitors on the power supply” issue—the same one Samsung used to provide free repairs for under that class-action settlement several years ago. I never had any repairs done under that settlement, because I wasn’t having any problems with my set at the time.
Now that I am having problems, Samsung is of course no longer offering to repair the issue for free, so I decided to try and fix it myself. I opened up the TV and noticed that what Samsung calls the sub-power assembly (part # BP96-01726A) had numerous leaky capacitors.Thinking this was the culprit I bought a replacement part online and installed it, only to find that it had absolutely no effect on the problem.
I had also looked at the set’s main power supply (part # BP44-01001C) which didn’t have any visible capacitor leakage, but since replacing the sub-power board didn’t fix the problem I thought maybe the main supply had some non-visible issues and replacing it would do the trick. Well, I replaced it, and it didn’t fix the problem either.
After wasting more than $120 on two different power supplies, I’m at my wits end here and at a loss as to what is making this DLP cycle on and off every time I turn it on. Actually it’s not quite EVERY time—if I turn it off and then on again a few seconds or evenminutes later it starts up without any problem, but if it’s been off for a few hours it exhibits the cycling problem every single time. I should also mention that once it finally turns on, it stays on, indefinitely without any problems. Since the issue only occurs when the set is "cold" it doesn't seem to have anything to do with heat building up (and in any event, I've verified that the fan is working).
Long story short, I can’t afford to do any more speculative repairs, but it seems like only a matter of time before the problem gets so bad that the TV won’t turn on anymore.
Does anyone have any idea as to what is causing my problem and how it can be fixed?
Thanks very much.
Last edited by MoranJ2000; 07-19-2014 at 09:02 PM.