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Samsung PCN5425R 54" Rear Projection Television - Page 6 Questions & Answers
Projection TV
Fame,
The symptoms you're describing appear to be convergence failure and probably only one of the convergence amps. That unit uses two STK392-040 IC's and it is HIGHLY recommended that you replace both - not just the one. The convergence amps are mounted to a large aluminum heat sink with a heat sink compound for the greatest heat dissipation. My personal experience with this particular model has been that replacing the IC's only restored normal operation in 9 out of 10 sets as opposed to having to replace any other corresponding resistors or other components. In laymen's terms it's probably only the convergence IC's that need replacing.
I strongly suggest that you not tackle this one by yourself unless your are fairly skilled at soldering. Too much heat on this multi-pin IC will destroy them and they're not cheap..
It's also a bit difficult getting the old ones out. If you don't do the job yourself find a good reapir shop and ask if they have the IC's in stock. If you're not sure where to find a reputable shop call NESDA, (National Electronic Service Dealers Assn.) They can refer you to a qualified member shop in your area...
If you do tackle this yourself, order only the Sanyo originals from places like B&D Electronics, Vance Baldwin, ACME or Samsung. And use a fairly good heat-sink compound...
Blue alignment still does not work after IC replcaement
You are going to need to get a schematic diagram and trace out the resistors and capacitors in the convergence circuit or power supply as most of the time you dont need one and replaceing the IC's will fix it, but sometimes other things have went bad because of the defect in the Convergence drive IC's or one of the new ICs could be defective. Would not be the first time I have seen this problem. Did you buy tHe exact replacement IC? Did you use heat sink compond behind the IC on the heat sink? These two things are very important as well. If you dont have a multimeter and now how to us one as well as read a schematic, you may want to seek out the assistance of a pro. Good Luck
PS please dont forget to rate this thread.
Auto focus not fixing blue shadow
Well now the convergence IC's need to be replaced. they are two black IC on a metal heat sink and they start with STK on them. If you dont understand the schematic, dont attempt this repair by yourself, as you have to unsolder the old ones and resolder the newer ones back in. Also you may have small fusable resistors that went out also if the iC shorted out. Also the heatsinks need heat grease on them. seek out a pro to assist you in this repair.
Samsung 55 TV White vertical patches?
It sounds like you might be dealing with backlight bleeding or an issue with the LED backlighting in your TV. This can sometimes occur over time due to normal wear and tear or manufacturing defects. If it started as a faint single brighter section and has now expanded to four, it's likely a hardware issue. While it may not be an easy fix, contacting the manufacturer's customer support or a professional technician would be a good next step to diagnose and possibly repair the problem. If you'd like, you can share the pictures for a more accurate assessment.
4/14/2024 7:29:30 PM •
Samsung...
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Answered
on Apr 14, 2024
Samsung un55nu6950fxza TV
These LEDs are very susceptible to static electricity damage. What happens when they get zapped is a tiny threading fault starts in the LED crystal. The aluminum contact metal starts migrating into the crack, makes it wider and longer, and eventually goes all the way through the LED and shorts it out. When that happens, the metal overheats and burns out the LED so the entire string goes dead.
What this means for you is that the original LED may have been may have been zapped at the factory. The replacement strip likewise, or when it was removed from another TV (if it is a used part), or when you put it in. It should have been in anti-static packaging. You have to be very careful not to touch any of the circuitry on the LED strip, and make sure you ground your hand to the TV metal both before picking up the LED strip and right before connecting the strip to the TV. Better yet, use an anti-static wristband connected to the TV frame.
It is possible that the LED driver for that string is pushing too much current, but that's not likely. You would probably notice that part of the screen is unnaturally bright.
2/5/2024 6:37:37 PM •
Samsung...
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Answered
on Feb 05, 2024
Brand new Samsung 77 OLED tv. Got knocked off the stand and fell on and bent the lower corner
It sounds like your TV has a display issue, likely caused by physical damage to the screen due to the bend. Repairing a damaged screen can be quite expensive, often nearing or exceeding the cost of a new TV, especially for larger screens like the one you described.
Here are a few options you might consider:
- Sell it as is: You can try selling the TV in its current condition, clearly describing the issue with the display. Some buyers may be interested in purchasing it for parts or attempting a repair themselves.
- Attempt a DIY repair: Depending on your technical skills and willingness to take on the challenge, you could try to repair the TV yourself. However, this can be risky and may void any remaining warranty. There are online tutorials and replacement parts available, but again, this route requires some technical expertise.
- Professional repair: You could contact a professional TV repair service to get an estimate for repairing the screen. Be sure to weigh the cost of repair against the potential selling price of the TV after it's fixed to determine if it's worth the investment.
- Sell for parts: If repairing the screen is not feasible, you could dismantle the TV and sell its components individually. Some parts, like the internal circuitry or casing, may still hold value to electronics enthusiasts or repair professionals.
- Trade-in or recycle: Some retailers offer trade-in programs where you can exchange your old electronics for store credit or discounts on new purchases. If the TV is beyond repair, you can also look into recycling options to properly dispose of it.
Ultimately, the best option for you will depend on the extent of the damage, your budget, and your willingness to invest time and effort into repairing or selling the TV.
2/4/2024 5:20:05 PM •
Samsung...
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Answered
on Feb 04, 2024
Component units not displaying color
I think you need to check the color settings on your new LG TV and ensure all cables are securely connected. If the issue persists, you don't have further options except to contact LG support for assistance.
1/5/2024 8:10:23 PM •
Samsung...
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Answered
on Jan 05, 2024
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