Hello All, received another project just in time for the holidays! The only difference between this one and the others is that it belongs to my father-in-law so I actually have to repair it without destroying it!
Apparently he was watching it for some time when all of a sudden the picture went out, the sound was still working.
When I got it back to my house I opened her up and checked out all the usual suspects, nothing burnt, no blown fuses, etc.
Here's what I know:
1. All voltages are correct except for VSCAN, which bounces around all over the place and never settles.
2. When I turn the TV on, there is absolutely no image on the screen, no glow, no illumination whatsoever.
3. The first few times I turned the tv on, after the startup chime there was a brief flash of "horizontal snow" for lack of a better description, then nothing. I proceeded to jump pins 3 & 4 on the CTRL board with the LVDS cable removed to see if I could get a test pattern, but I never got anything from the test. Powering on the tv after the test attempt now results in nothing on the screen at all.
4. The LED on the CTRL board blinks once per second, indicating normal operation.
My gut tells me it's a failed Y board and seeing as they're ~$40 on ebay at the moment, I wouldn't hesitate to throw a board at it and see if it does the trick. I'd even replace all of the boards if anyone on here deemed it necessary. My usual method of "butcher it until it's fixed or FUBAR" doesn't apply here!
I always remain hopeful and I know that someone will guide me on the path of diagnostics(cough cough Tom66). My only worry is that I've seen multiple threads on here with these 50" sammys that are unresolved. There's even one guy who replaced all boards on the tv only to still have no picture!
So I guess my first question is, where do I start? Feel free to make me double check any readings you'd feel would shed some light on the issue, I'm known to figure out the hard stuff while overlooking the simplest things!
As always, any help would greatly appreciated!
Apparently he was watching it for some time when all of a sudden the picture went out, the sound was still working.
When I got it back to my house I opened her up and checked out all the usual suspects, nothing burnt, no blown fuses, etc.
Here's what I know:
1. All voltages are correct except for VSCAN, which bounces around all over the place and never settles.
2. When I turn the TV on, there is absolutely no image on the screen, no glow, no illumination whatsoever.
3. The first few times I turned the tv on, after the startup chime there was a brief flash of "horizontal snow" for lack of a better description, then nothing. I proceeded to jump pins 3 & 4 on the CTRL board with the LVDS cable removed to see if I could get a test pattern, but I never got anything from the test. Powering on the tv after the test attempt now results in nothing on the screen at all.
4. The LED on the CTRL board blinks once per second, indicating normal operation.
My gut tells me it's a failed Y board and seeing as they're ~$40 on ebay at the moment, I wouldn't hesitate to throw a board at it and see if it does the trick. I'd even replace all of the boards if anyone on here deemed it necessary. My usual method of "butcher it until it's fixed or FUBAR" doesn't apply here!
I always remain hopeful and I know that someone will guide me on the path of diagnostics(cough cough Tom66). My only worry is that I've seen multiple threads on here with these 50" sammys that are unresolved. There's even one guy who replaced all boards on the tv only to still have no picture!
So I guess my first question is, where do I start? Feel free to make me double check any readings you'd feel would shed some light on the issue, I'm known to figure out the hard stuff while overlooking the simplest things!
As always, any help would greatly appreciated!
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