EMERGENCY!!! Broken Samsung 42" Plasma HPT4254X/XAA

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ben7 said:
I did not have any bad caps in my TV, but they were CapXon which are not the best brand.
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Bit of an understatement - they are absolutely terrible capacitors, and it's worth changing them as a matter of course.

It's the Capxon capacitors that kill most Samsung TV's.
 

there is no fan in the TV?? My panasonic 42" has 3 fans in it!! I can feel the warm air getting out of TV
 
carmusic said:
there is no fan in the TV?? My panasonic 42" has 3 fans in it!! I can feel the warm air getting out of TV
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The early plasma's had fans, later ones take less power and don't have fans - they still use more power and run hotter than LCD's though.
 
carmusic said:
there is no fan in the TV?? My panasonic 42" has 3 fans in it!! I can feel the warm air getting out of TV
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Yeah mine didn't have any fans in it. If the mosfets overheat again, I am going to fit some fans in it as I have a junk box full of them.
 
You would have to replaced all the mosfets, although they seems to be good. They will break down after a period of time and eventually short out and damaged the small diodes and resistors on the bottom of the PC board.
 
Ben, thx for the heads up. Mine just died a few mins ago with the same symptoms. Going to troubleshoot tomorrow. Where did you buy the transistors? Any specific brand you recommend? Thx in advance
 
Meteoro said:
Ben, thx for the heads up. Mine just died a few mins ago with the same symptoms. Going to troubleshoot tomorrow. Where did you buy the transistors? Any specific brand you recommend? Thx in advance
Click to expand...

TBH I don't remember where I got the repair kit.

The four MOSFETs that the repair kit included were:
2x FQP9N50C ----- TO-220F
2x FQA13N50C --- TO-3PN

If any of the capacitors are bulged, I recommend replacing them too!
 
Check for dry joints fet's center heatsink. If ok disconnect supply to YSUS board and check if power supply stays running. Let me know what happens
 
ben7 said:
A new laptop (cheapy one) that my mom got will not properly install anything on it; it tells you that the installation is corrupted!-LOL it is made by ACER and it has windows7.ACER IS the WORST computer company ever
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LOL

My Acer is going to be six years old this December. Best Lappie I ever purchased. It has worked every day for @ least 8 Hours....since new.

No problems ever. Just the screen is getting dim. As to be expected.

Regards,
tvtech
 
After further research you may require a kit of parts to repair your plasma TV. This is available from Chas Hyde & Son Ltd. For your PSU type you want kit P/ No. KT67 £26.34. Hope this will help
 
I noticed this is an old post, but looks like the topic is still going. If you still need the service manual for HPT4254X/XAA I've attached it.

PS: If you ever need a service manual, ask on a Latin-american repair forum, not on those ridiculous sites that charge a fortune. The "repair instead of throw out" philosophy still applies here, and a lot!
 
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