LC-40E77UN shuts down after 5~10 mins and will not power on for a while

[PotShotScott]

Okay so I have a Sharp LC-40E77UN. It powers on and then shuts down after about 5 minutes.

It's late in the evening but I just got done reviewing this thread about AC-DET in a similar model.

https://www.badcaps.net/forum/showth...&highlight=68k

Tomorrow I plan to re-read the thread to see if there's more info I can glean from it. I believe the PSU boards are similar if not the same model. Is there anything else I should know that's not in the thread linked here?

[PotShotScott]

Re: LC-40E77UN shuts down after 5~10 mins and will not power on for a while

I have a new problem with this TV. Now it does not power on at all. I have a VOM on the AC input and show about 63VAC with ALL of the connectors removed from the PSU board. I imagine I'm looking for something on the AC side of the PSU. Anyone have any experience with this? Power supply part number is DPS-208BP. I don't see anything burnt. I've done some Googlin' - anyone have the schematic to this PSU?

[budm]

Re: LC-40E77UN shuts down after 5~10 mins and will not power on for a while

First of all you are using the wrong GND for testing the incoming AC that is why it is showing 63VAC.
When checking incoming AC you will be measuring between LONE (Phase) and Neutral.
And when check the Voltage in the primary HOT DEADLY side DC circuit you will use the negative legs of the main filter cap as the GND ref for your meter. You can use chassis as the GND ref. when working on the COLD side of the circuit because the cold side GND of the circuit is also connected to the chassis.
Since you are not familiar with HOT side I would suggest to at least plug the TV into the GFCI so you do not get kill.
So what DC Voltages do you get on the connector of the power supply that goes to the main board? Make sure to put down pin name and follow by the Voltage readings so we do not have to guess what the pins function are for.