Blinking Stand By LED Light In LED TV Repaired
A customer sent to me this Samsung 22″ LED TV with the complaint of front red light power LED blinks. The usual cause of power LED blinking are output voltages from the power supply fluctuates or improper, bad memory ICs in the mainboard or the DC supply voltage to the memory ICs was improper.
I took out the cover and saw the power supply/LED Driver and the mainboard-see the photos below:
I flipped the power/LED Driver board to look at the ICs.
I saw the LED driver IC and the 5 volt voltage regulator IC.
For your information, usually TV power board has a small chart of the output voltages and signal printed on it -see the photo below:
You can use the information provided by the chart to do your troubleshooting work.
I turned on the power and measure the 5 volt IC output and it was showing 0 volt-see the photo below:
I soldered out the defective IC and replaced it with a good one and turned the power On again.
Look at the TV display. I was satisfied with the work and could charge my customer to earn some profits.
Conclusion- In the above case, the repair was quite easy. It was just a bad 5 volt regulator IC. Assuming if the IC is good then I may need to start to troubleshoot on the mainboard especially the memory ICs. Ok that’s all for it and will see you again next time. All the best.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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