Re: Vizio E550VL: Plug In = continuous on/off clicking
I have not been able to find anything significant that I can tell is wrong on the main board. It remains incredibly difficult to test without being able to power on and measure voltages.
My theory is that there is a failed component somewhere in the 5vSB circuit causing a send or short to PS_ON, but also causing an autoprotect to trip and shutdown power, thus the continuous cycling, even with PS_ON cut.
Several questions:
1) When I test 5vSB, whether under (simulated) load or just the (digital) voltmeter, the tester jumps to 9.25v - EVERY TIME - for a split second before settling at about 5v. I thought it was just an anomalous reading before the voltmeter 'settled down,' but is this normal? Or is it a possible defect in the PS? Can I test by using a Computer PS to power the main board 5vSB with the LCD PS disconnected?
3) Can I cut 5vSB, and manually trip PS_ON to cut out 5vSB to the Main Board since that seems to be where the problem starts?
2) The Vizio E552VL uses the SAME LCD panel (LC550WUB-SCA1) as the E550VL. My Main Board has an integrated TCON (Chip in the upper-left corner of the board?). The inverter boards are listed as interchangeable for E550VL and E552VL. If I get a main board for an E552VL that has an integrated TCON chip...Will it work? It is much cheaper than getting the E550 VL Main board, if I can find one at all. I know I may have to remove an extra USB and HDMI port, or modify the case, but the mounting points and board size appear to all match up...
Thanks for any input!
I have not been able to find anything significant that I can tell is wrong on the main board. It remains incredibly difficult to test without being able to power on and measure voltages.
My theory is that there is a failed component somewhere in the 5vSB circuit causing a send or short to PS_ON, but also causing an autoprotect to trip and shutdown power, thus the continuous cycling, even with PS_ON cut.
Several questions:
1) When I test 5vSB, whether under (simulated) load or just the (digital) voltmeter, the tester jumps to 9.25v - EVERY TIME - for a split second before settling at about 5v. I thought it was just an anomalous reading before the voltmeter 'settled down,' but is this normal? Or is it a possible defect in the PS? Can I test by using a Computer PS to power the main board 5vSB with the LCD PS disconnected?
3) Can I cut 5vSB, and manually trip PS_ON to cut out 5vSB to the Main Board since that seems to be where the problem starts?
2) The Vizio E552VL uses the SAME LCD panel (LC550WUB-SCA1) as the E550VL. My Main Board has an integrated TCON (Chip in the upper-left corner of the board?). The inverter boards are listed as interchangeable for E550VL and E552VL. If I get a main board for an E552VL that has an integrated TCON chip...Will it work? It is much cheaper than getting the E550 VL Main board, if I can find one at all. I know I may have to remove an extra USB and HDMI port, or modify the case, but the mounting points and board size appear to all match up...
Thanks for any input!
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