LG 50PC5D YSUS/ZSUS Issues - Videokarma.org TV - Video

YamahaFreak · #1 02-05-2015, 08:19 PM

I really think I need a better iron. I have two; one is a Heathkit with three settings from the 1960s, and the other is a cheap Chinese one I paid $6 for...

Findm-Keepm · #2 02-05-2015, 09:35 PM

Quote:

Originally Posted by YamahaFreak

I really think I need a better iron. I have two; one is a Heathkit with three settings from the 1960s, and the other is a cheap Chinese one I paid $6 for...

Invest in a good Weller or Hakko - I've used a WP25 and WP40 for board work in the past, but switched to a Hakko 936 station. MAT Electronics had them on sale in 2009 or 2010, so I took the plunge. Chem-wik is a good brand of solder wick, although I've used others. I also like chip-quik solder for removing multileaded devices soldered with lead-free solder. It lowers the melting point quite a bit. It's a bit pricey, but I still have more than half after 3 or 4 years.

Cheers,

YamahaFreak · #3 02-05-2015, 10:59 PM

Okay...decision time.

I think what I am going to do is purchase a used YSUS board and install that. I have tested most of the other boards in the TV and see no reason to believe the board will be damaged if I install it. One question, though: If the donor TV's screen was cracked while it was in operation, or it was powered on after being cracked, would the board harm itself or my TV?

drussell · #4 02-06-2015, 07:06 AM

Quote:

Originally Posted by YamahaFreak

One question, though: If the donor TV's screen was cracked while it was in operation, or it was powered on after being cracked, would the board harm itself or my TV?

Powering on with a cracked panel almost always blows chips on the buffer board and often damages the Y-Sustain board also, yes...

Best to get a known working, tested good, board.

YamahaFreak · #5 02-06-2015, 12:20 PM

I do know that this seller will take the board back less return shipping if it doesn't work. Now, all I need to worry about is my set damaging his board...

YamahaFreak · #6 02-09-2015, 12:30 AM

Well, the replacement YSUS board is on its way. Wish me luck in keeping the magic smoke contained! I'll report back once the 'new' board is installed, hopefully with a photo of a happy TV.

YamahaFreak · #7 02-18-2015, 01:20 PM

The replacement YSUS board came in today. I checked the fuses and did a visual inspection...all looks good. Upon installation, still no picture! When I turn the set off, there is an ephemeral, barely perceptible flash on the panel. I also noticed that all three heat sinks on both sustain boards don't get nearly as warm as they did before, and in particular, the larger of the two YSUS heat sinks stays stone cold. No fire or smoke, though! Upon closer examination of the new YSUS board, I found the small surface mount fuse near the bottom row of capacitors to be ...odd. With my multimeter, it tests differently than good, but not completely open. I guess this is the problem? I'll probably ask for my refund now, and hope a better board becomes available.