Re: Sharp Aquos LC-46E77UN inverter testing

That’s interesting.... When I power it up with CH_DOWN and VOL_UP, the behavior is mostly the same: after 7 seconds the backlights do that brief, dim flash, and all of the ‘higher’ voltages from the power unit drop to zero (UR13V to the master board, the 12V and 60V lines to the inverter, and the 12V line to the LCD unit). The difference I see is that the PS_ON from the master board stays high (2.9V) and there is no second “click” from the power unit relay..... I guess in this mode the master board ignores...

Re: Sharp Aquos LC-46E77UN inverter testing

On the master I have these measurements:
1361, 1362, 1371, 1375, 1369, 1376, 1370, 1372, 1378, 1369

On the slave I have these:
1368, 1364, 1371, 1379, 1374, 1376, 1366, 1384

The lowest is 1361 and the highest is 1384; that doesn't seem too bad?

I picked this TV out of a trash pile. When I plug it in I can hear the relay on the power supply “click” almost immediately, and then 7 seconds later there is another “click” and the power/OPC LEDs start to flash: two pulses on the power LED, one on the OPC LED. I didn't notice any sign of life from the backlight, but more on that below.....

The service manual () says this is a “DET_10V error: UR10V or A9V is not applied”, but after checking several voltages I believe the power unit is tripping off due to an overload as soon as the backlight tries to come on; this kills...

Re: New Members - please post your introductions here

Hello, my name is Jack. I have enjoyed tinkering with electronics for several decades, but as I near retirement from my day job I am spending more time at it. Mostly I just enjoy the puzzle-solving aspect of diagnosing a problem in a piece of equipment; and, I can't stand to throw away a broken item without having at least tried to fix it myself.

Google has led me to this forum dozens of times, so I thought it might be time to finally join.