This 24″ Innovex LED TV came in with the complaint of stand by power fault. Usually standby problem can be caused by bad power supply or the mainboard problem. If the power supply fault, usually will be the improper dc supply voltage to the mainboard. For example, a 5 volt standby voltage can be intermittently fluctuates due to bad filter cap problem.

If the mainboard fault then it can be caused  by memory ics or components in the voltage regulator circuit. The photo below is the power supply board:

In the photo below, I checked on the voltages at the connector (left side) , I found the voltages to be good so this has nothing to do with the power supply fault.

My focus now was in the mainboard and when I checked on the voltage after the 2.2 Ohm resistor shown below, instead of 5 volt, I got only 4.2 volt which was abnormal.

Just to be certain that the voltage has to be 5 volt, I took out a junk board (similar model) that had no picture problem, I measured the same point and I got 5 volt!

This confirmed that the circuit line have problem and this 5 volt line was going to a P channel FET P06B03LVG IC.

It was an 8 leads IC in which there were two P-channel FET built into it and you can check the datasheet by clicking on the datasheet photo below:

After the replacement of the IC, I powered on the TV and the voltage shown 5.2 volt as clearly seen from the photo below:

The screen image immediately appeared and problem solved.

Conclusion- The actual cause was the IC had a slight short circuit pulling down the DC voltage from 5 volt to 4.2 volt in which it was not enough to supply to other circuits. Due to this the front power LED was red indicated stand by problem and it has nothing to do with the corrupted date in the memory ICs. If you wish to learn how to check and test electronic components, I can recommend Jestine Yong’s ebook here.

You can also check out Hunphrey’s latest ebook in LCD/LED TV by clicking on the ebook cover below:

This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.

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Note: You may check out previous post about fixing active speaker in the below link:

https://www.electronicsrepairfaq.com/blue-screen-in-tv-repaired