VIVO PTV43HD no PS-ON signal

[dkneyle]

Re: VIVO PTV43HD no PS-ON signal

Took to the mainboard with acetone. It shifted any remaining glue, but didn't bring it back to life. Under a high mag lens it appears there may be some VERY small SMT components around the red socket which sends the POWER ON signal missing. Hard to tell if the pads are blank or if some components have 'dissolved' under the glue. I also confirmed the power switch was pulling the voltage down at the mainboard socket just as it should (~3V down to 0V when clicked) so that wasn't the issue. Looks like I'm purchasing that mainboard for A$80 plus post just to say I saved another from the dumpster.

[dkneyle]

Re: VIVO PTV43HD no PS-ON signal

Problem identified, solved, but I am so pi**ed off too.
Turns out the problem was a poor connection at the PS-ON socket and plug on the mainboard (red socket in images I provided). It was covered in that horrible glue and appears to have dissolved the plastic connector and damaged the connection. I'm kicking myself that I didn't explore that further last week. Let me explain the turn of events.
Ordered a 2nd-hand mainboard at an extraordinary cost of over A$100, but was only one available anywhere. Dropped it in and I still couldn't get the TV out of standby. Wiggled that connector and suddenly we had power on. As I explored further the PS-ON wire just came away from the connector. Got that sorted, power on, but no menus coming up on screen. Could it still be a defective replacement mainboard? Was my original mainbaord defective at all?
Swapped over and yes, TV came fully to life. Now I'll have the battle of getting my money back for the mainboard. Arghhhh....

So just watch out everyone for this brown glue gunk. Corrosive to everything it comes in contact with!

[dskall]

Re: VIVO PTV43HD no PS-ON signal

Thanks for follow up. Glad everything working and one less in the dump.