I'm working on a Vizio VP42 HDTV (PDP42X3U400) that I picked up from next to an apartment complex dumpster. Someone had already taken it apart (back panel was missing half the screws), and the only thing they seemed to have touched was the fuse, which was missing. I happened to have a couple 250V 8A fuses lying around, so I immediately replaced that fuse. At that point I checked all the other fuses on the tv set with my dmm, and they all had continuity. There were no apparent blow capacitors or resistors.
When I turn the set on, the solenoid clicks, and the tv acts like it is about to power on, but then after 3 seconds or so, it silences the TV static buzz, and even though the led indicator on the front of the tv has changed from orange to green and will remain green until I turn it off, the screen itself remains pitch black. No picture, no picture remnant, even when shined upon by a bright flashlight.
I played around with checking the output voltages from the power supply, and they seem normal, but only when the below happens:
I figured out after some playing around that when I turn the set on with the cord/cable from the power supply to the Z-sus disconnected (see picture) then I get the solenoid click and the Vizio stays on, and half the screen will have "snow" on it and the other half will be black, but a slightly lighter than power off black. When I do this, and then I power off the TV, it will not allow me to power it back on unless I first cut the power to the tv(I'm using a power strip) and turn it back on.
Have I correctly identified the issue as the Z-sustain board, because I heard somewhere that the system will do a power-up check, and if any board is not working correctly, it will not allow the tv to run. When I disconnect this board's power, the tv does not immediately shut down anymore.
If you all can confirm the z-sus board is bad, I don't really want to troubleshoot it piece by piece, I'd prefer to just buy a new one off ebay ($50ish) and throw it in. I just thought I'd get the forum opinion before I did that.
Also, any product repair manuals would be appreciated. I don't know where to begin to look.
- Justin
When I turn the set on, the solenoid clicks, and the tv acts like it is about to power on, but then after 3 seconds or so, it silences the TV static buzz, and even though the led indicator on the front of the tv has changed from orange to green and will remain green until I turn it off, the screen itself remains pitch black. No picture, no picture remnant, even when shined upon by a bright flashlight.
I played around with checking the output voltages from the power supply, and they seem normal, but only when the below happens:
I figured out after some playing around that when I turn the set on with the cord/cable from the power supply to the Z-sus disconnected (see picture) then I get the solenoid click and the Vizio stays on, and half the screen will have "snow" on it and the other half will be black, but a slightly lighter than power off black. When I do this, and then I power off the TV, it will not allow me to power it back on unless I first cut the power to the tv(I'm using a power strip) and turn it back on.
Have I correctly identified the issue as the Z-sustain board, because I heard somewhere that the system will do a power-up check, and if any board is not working correctly, it will not allow the tv to run. When I disconnect this board's power, the tv does not immediately shut down anymore.
If you all can confirm the z-sus board is bad, I don't really want to troubleshoot it piece by piece, I'd prefer to just buy a new one off ebay ($50ish) and throw it in. I just thought I'd get the forum opinion before I did that.
Also, any product repair manuals would be appreciated. I don't know where to begin to look.
- Justin
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