Author Topic: Samsung tv repair  (Read 3979 times)

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Offline snipersquad100

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Samsung tv repair
« on: November 09, 2013, 11:35:24 am »
Hi I got a Samsung ps43d490-a1w  The tv just blinks the red led when I switch on the power. I cant find a schematic on this set so I am stuck. How do I find out what board is the problem. |O

Offline mariush

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Re: Samsung tv repair
« Reply #1 on: November 09, 2013, 01:10:45 pm »
Open it up, measure voltages, inspect components (see if there's bloated capacitors), see what happens when you push buttons (does the psu get out of stand-by?)

Check linear regulators on the boards, sometimes they fail...

Some Samsung tvs also have problems with corrupt eeprom chips... can't help you there though.
 

Offline tom66

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Re: Samsung tv repair
« Reply #2 on: November 09, 2013, 01:27:26 pm »
X-main board 99% of time. Currently nonserviceable (replace board only) due to unknown failure cause.
When replacing X-main also replace Y-main and update TV firmware (bug in firmware kills X-main board.)
X-main responsible for common electrode of plasma display.
« Last Edit: November 09, 2013, 01:30:22 pm by tom66 »
 

Offline snipersquad100

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Re: Samsung tv repair
« Reply #3 on: November 09, 2013, 01:50:55 pm »
ok thanks

Offline snipersquad100

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Re: Samsung tv repair
« Reply #4 on: November 09, 2013, 01:52:01 pm »
is it possible to rule out the power supply

Offline tom66

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Re: Samsung tv repair
« Reply #5 on: November 09, 2013, 02:46:14 pm »
Yes. Unplug X- and Y-main. You should get brief Vs:205V or so, Va:55V or so and also TV audio will work. Note, Vs and Va will shut off after a few seconds if X- and Y-main not connected, this does not indicate a fault.

Actually that's a good point I thought you had click on-click off symptom but you did not mention this. Maybe I jumped ahead.
Try this test (X- and Y-main reconnected): http://www.badcaps.net/forum/showpost.php?p=318461&postcount=2
« Last Edit: November 09, 2013, 02:48:26 pm by tom66 »
 

Offline snipersquad100

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Re: Samsung tv repair
« Reply #6 on: November 09, 2013, 04:11:50 pm »
what should happen when you connect the two pins?


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