I have a Samsung 40 inch that was possibly struck by lightning. if its unplugged for 30 mins or so and you plug it in tv automatically comes on with out turning it on and it will play perfectly for about 2 mins then shut off. then the red Led LIGHT WILL BLINK but with out a common pattern. the tv will not turn back on until tv is unplugged for a period of time. Any suggestions on what may be the issue as in the power board or mother board. Thank you in advance.
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Re: Samsung LN40B550 stays on 2 mins then shuts off
First do a couple of simple checks.
Enter the service menu and see if they're are option called
'Ready'
Or
'Watchdog'
If either of these are ON turn them OFF. -
Re: Samsung LN40B550 stays on 2 mins then shuts off
On the power supply there is a ribbon cable that goes to the main board. Measure all the pins and post them here with their corresponding pin out, with the TV on and then again when the TV acts up.Comment
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Re: Samsung LN40B550 stays on 2 mins then shuts off
Thank you all . It was the main board . A cpu i guess was getting over 140 degrees and it would shut off. I used a laser temp gauge and a blow dryer on cool air and as long as I kept the cpu around 128 degree the tv played properly but when I removed cool air it would heat up and shut off.Comment
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Set was manufactured in 2012. I'm trying to diagnose where the problem is. I am assuming it is over-currenting after heating up? Display looks fine until it decides to shutdown. If I keep turning it on, it will eventually refuse to power up and requires unplugging to get it to respond again.
I originally thought there would be some easily detected bad electrolytic capacitors, but I don't see the telltale signs. There might be some very minimal bulging on one of the x buffer board. BN96-22092A (LJ92-01852A).
If I unplug the power feed to the X/Y board (LJ92-01854B), the... -
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