TV has no display -- Need advice on Z Sustain Assembly Board
LG 50" Flat Panel TV / Model # 50PX2DC
My 14-month old TV no longer shows a picture. It powers on fine, but no picture appears. A technician assessed the problem and deteremined the Z Sustain Assembly Board failed (LG part #LG Part #: 6871QZH044A).
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Check the sustain board/s for fault. Check the main power supply regulator board too. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Usually a shorted Y-driver/buffer board( skinny boards on left edge) one or both, don't run this model TV with these boards unplugged. Also less likely but possible is bad Y-sustain board (bigger board on left side)
The Problem is in either power supply or the Y-Sustain board.
The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.
Often there are fuses on that board - one or more. Check those.
if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.
This is a common problem for these sets, you will find it is your Y Sustain board, when the back is off your Tv it is on the left hand side and will have 2 x white fuses, one of these will be blown usually F2 replacing the fuse will not solve the problem, the issue is down to the IMP module that is underneath the heatsink, these with time overheat and go faulty. replacement of these is very difficult ( Beleive Me!! ) so reallly i would take the part number off the board. I think it is this..... 6871QYH039B and just buy the whole board and replace. 99% of the time this will cure your fault. Hope this helps Please rate my reply ++++