Thanks for the tips! I have done lots of smd soldering by hand and using a hot air rework station, all for.small parts, but I have never reflowed a BGA.
I have a few type K thermocouples. I can use them to monitor temperature.
Should I also apply heat to the back side of the board?
I only have a metal hotplate, i guess this is better than nothing....

Thanks, I will reflow the BGA with proper flux for BGA and use SMD hot air rework station.
I powered on the TV today and now it will not turn on. It has two short red led flashes then off. Service manual says CPU communication error, so I would say you are right, it's the BGA....

Thanks for the information. I agree the quality of manufacturing has reduced now days. Older equipment was made better.
About the BGA, you said has nothing to do with it. What do you mean? What do you think the fault is?
Should i still consider reflowing the BGA?...

Thank you for the information. Since the TV is quite old now, instead of reballing the BGA processor, I want to try just reflowing it first. Is this worth doing in your experience?
I found that the thermal pad on the back of the BGA processor has been seeping silicone everywhere, on the back of the pcb and also through the vias under the processor and then under the processor and on the top of the pcb. In this situation if any connections to the processor have become slightly disconnected, the silicone oil will make conductivity worse. I rinsed under the processor with 100% isopropyl alcohol...

Hey Lotas, thanks for the quick reply.

Are you referring to the BGA processor on the CPU board or the Tcon board?

Are you saying the solder joints under the BGA fail, or the BGA device itself fails and requires replacement?

Regarding the "lamp error" counter exceeding 5 and the "TV is blocked", what do you mean it is blocked? The display still works, just intermittently drops out....

Hi guys, great to find this forum with so much knowledge. I was a component level repair tech of consumer electronics and IT equipment a long time ago. I may be rusty but you never forget fundamentals of diagnosis, test and measurement.
Hope I may be of some assistance to the world ....

Hey guys,

I have a SHARP LC-60LE640X TV that has suddenly developed an intermittent fault of flashing white noise patches (appears like an Analog tuner off signal) and then totally dropping out.
This model I believe is also known as LC-60LE600U or LC-60LE640U in other regions.

FYI, a long time ago I was a component level repair tech for all consumer electronics and IT equipment.
I'm a bit rusty but still have ability to dig right down.

I measured all power supply lines and checked them for AC ripple voltage. Noting any lines that exceeded about...