Sharp LC-60LE452U Working (Not)!

[Lupin3]

I just bought a Sharp 60" LCD tv that was not working at all: no standby light, no backlight, no video or audio. There is just a hum from the power board when I opened the back and plugged it in and to try to turn "on". I measured the standby volts (and the power-on volts) and when everything is plugged in, the volts fluctuate high and low near the expected 5V. Here comes the tricky part: If I unplug the Power Board line to the FRC Board and then plug the tv in, it automatically activates the standby light turning blue, the backlights turn on and the volts from the Power Board are steady. If I shut off the tv once again (the standby light is red keeping it plugged in), then replug in the FRC Board to the Power Board and turn the tv on, everything works as new! The only problem is that if I turn the tv off and then try to turn it on, it is completely dead once again!

This is what's baffling me: which Board would prevent the tv to turn on normally considering it DOES turn on after replugging in the FRC Board if I follow the above steps???

Any expertise would help me sleep at night...:

[kasfamily]

Re: Sharp LC-60LE452U Working (Not)!

Show the photo FRC board

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Here's the shot...

[kasfamily]

Re: Sharp LC-60LE452U Working (Not)!

It is necessary to check the main power supply module why 5 volts are changing.

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Thanks for responding. Sorry, when you suggest the "main power supply module", do you mean something specific on the Power Board itself? I'm not too familiar with the component terms. Should I start with replacing the Power Board since it can't keep the power steady when I plug in the FRC Board?

[kasfamily]

Re: Sharp LC-60LE452U Working (Not)!

… Show a photo of the power supply

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Where would I find the "U8, U4, U5, U6"? Power Board?

[kasfamily]

Re: Sharp LC-60LE452U Working (Not)!

Where would I find the "U8, U4, U5, U6"? Power Board?

Main board

[kasfamily]

Re: Sharp LC-60LE452U Working (Not)!

Start checking with the power supply

[kasfamily]

Re: Sharp LC-60LE452U Working (Not)!

Ps

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Power supply is putting out volts as indicated in diagram but fluctuate when FRC is plugged in.

[Diah]

Re: Sharp LC-60LE452U Working (Not)!

its much caps issue at cold area power boards. V okay but lack with currents which caps responsible.

[Diah]

Re: Sharp LC-60LE452U Working (Not)!

try heat the all caps at cold area with hair dryer and turn on see if it come straight on while FRC connected in place.

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Will do the hair dryer trick...here's what my Board looks like.

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

3 pics to see the caps

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Success with the hair dryer!!!
Does this mean the Power Board is the problem?

[Diah]

Re: Sharp LC-60LE452U Working (Not)!

Success with the hair dryer!!!
Does this mean the Power Board is the problem?

one or 2 caps are at end life. no need to replace boards do it just caps. you can all replace with less 3$
at yours photo its look 2 caps swollen up.. any in this shape change it

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Well, thank you for guiding me with the troubleshooting. You were a great guide A new Power Board it is!

Aufwiedersehn!

[lotas]

Re: Sharp LC-60LE452U Working (Not)!

The photo shows that five capacitors are swollen, well, it's better to replace everything.

[Lupin3]

Re: Sharp LC-60LE452U Working (Not)!

Much appreciated about the 5 caps - will replace the Board