This set was originally dead, apart from the green light which would cycle on/off every 10-15 seconds or so.
That fault was a surface-mount cap, C2508 in the PSU board. Many other of those 'Orrible surface-mount electrolytics have also been replaced in an attempt to cure the other fault.
That other fault--which it still has occurs when the set is cold. Certain brightness parts of a picture will be very 'noisy' sparklies/greenish/black usually following lines of contour, say a person's face, you get hideous 'lines' almost making the picture look negative--but its not...
As the set warms up, this lessens to Almost un-noticable, almost perfect, but the certain brightness still has a 'shimmer' There's a few sparklies of green/red on black of the pic..
Bright scenes are good, bright, sharp. no signs of streaking or picture retention etc.
The PSU voltages are all correct but there's one supply, 'Vw' checkable on YSUS thats about 8-9V higher than it should be. (186V)
--There Are NO Presets/adjustments In The PSU or the YSUS. Only one pot in the XSUS--that has no effect on anything -it seems, Ive had most of the boards out and checked, replaced the odd cap here and there to no avail.
Looking at the manual suggests its all set in software, but makes no mention of how to alter the PSU rails.
The voltage stays the same during fault and when the set is near perfect after warming up.....
Any ideas....?
That fault was a surface-mount cap, C2508 in the PSU board. Many other of those 'Orrible surface-mount electrolytics have also been replaced in an attempt to cure the other fault.
That other fault--which it still has occurs when the set is cold. Certain brightness parts of a picture will be very 'noisy' sparklies/greenish/black usually following lines of contour, say a person's face, you get hideous 'lines' almost making the picture look negative--but its not...
As the set warms up, this lessens to Almost un-noticable, almost perfect, but the certain brightness still has a 'shimmer' There's a few sparklies of green/red on black of the pic..
Bright scenes are good, bright, sharp. no signs of streaking or picture retention etc.
The PSU voltages are all correct but there's one supply, 'Vw' checkable on YSUS thats about 8-9V higher than it should be. (186V)
--There Are NO Presets/adjustments In The PSU or the YSUS. Only one pot in the XSUS--that has no effect on anything -it seems, Ive had most of the boards out and checked, replaced the odd cap here and there to no avail.
Looking at the manual suggests its all set in software, but makes no mention of how to alter the PSU rails.
The voltage stays the same during fault and when the set is near perfect after warming up.....
Any ideas....?
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