My first post....my first plasma.....a Samsung P51D450 which won't start....heartbeat LED blinks about every 6 sec. No sound or video. Relay clicks on and off and my analogue multimeter connected to Vs doesn't stir.
Power is fed to Xsus from the Ysus board. I can start the smps by disconnecting Ysus (and therefore Xsus) *and* the Ysus ribbon cable from the control board. Then Vs and Va sustain their correct voltages and the heartbeat LED blinks ever y sec. So the smps appears good, but still no sound or chime. If I isolate Xsus (both with or without the Xsus ribbon) the Ysus fault remains.
The Ysus PBA is a LJ92-01760A, see pic below. Can I be reasonably sure the fault is on this board somewhere? I've checked out all the videos and forums I can find. I have multimeters and 'scope but no ESR meter. I've resoldered anything that looks suspicious, and used an ohmmeter to check for o/c's and s/c's - nothing obvious. I haven't found any fuses to test - should there be?
Does it make sense to swap out the Ysus board - $60-odd - before I get sound/chime? Is there any way to check the signal/video board without the panel and therefore no on-screen menus?
I note CapKid's advice to forget trying to fix Ysus or Xsus at the component level, and other comments that an Xsus fault can take out the Ysus board or viceversa. Is this common, and what are my chances of needing both boards? Is it unwise to buy and swap out Ysus without Xsus?
Any ideas anyone?
Power is fed to Xsus from the Ysus board. I can start the smps by disconnecting Ysus (and therefore Xsus) *and* the Ysus ribbon cable from the control board. Then Vs and Va sustain their correct voltages and the heartbeat LED blinks ever y sec. So the smps appears good, but still no sound or chime. If I isolate Xsus (both with or without the Xsus ribbon) the Ysus fault remains.
The Ysus PBA is a LJ92-01760A, see pic below. Can I be reasonably sure the fault is on this board somewhere? I've checked out all the videos and forums I can find. I have multimeters and 'scope but no ESR meter. I've resoldered anything that looks suspicious, and used an ohmmeter to check for o/c's and s/c's - nothing obvious. I haven't found any fuses to test - should there be?
Does it make sense to swap out the Ysus board - $60-odd - before I get sound/chime? Is there any way to check the signal/video board without the panel and therefore no on-screen menus?
I note CapKid's advice to forget trying to fix Ysus or Xsus at the component level, and other comments that an Xsus fault can take out the Ysus board or viceversa. Is this common, and what are my chances of needing both boards? Is it unwise to buy and swap out Ysus without Xsus?
Any ideas anyone?
Attached Files
what did we say about hoarding too much stuff and depriving others of them?! *cough* socialism *cough* lol! 
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