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Search: Posts Made By: kingsapper
Forum: Troubleshooting TVs and Video Sources 11-24-2013, 12:08 AM
Replies: 12
Views: 3,648
Posted By kingsapper
Re: LG 50PS30 Z-sustain questions

Update:

Three of the GT45F122 IGBT's on the HV side of the board were short as well. So all up, that's 5 devices that shorted. Can anyone suggest a replacement for these? I can't seem to source...
Forum: Troubleshooting TVs and Video Sources 11-02-2013, 04:53 AM
Replies: 33
Views: 5,000
Posted By kingsapper
Re: How to Troubleshoot a Plasma TV (p50s602) with an Oscilloscope

Yeah, important safety tip: When this system is operating there may be FLOATING parts of the system. Not directly connected to safety earth, the heatsinks or other parts of the system may float...
Forum: Troubleshooting TVs and Video Sources 11-01-2013, 08:02 PM
Replies: 33
Views: 5,000
Posted By kingsapper
Re: How to Troubleshoot a Plasma TV (p50s602) with an Oscilloscope

Test points are handy, but if you can get a service/training manual for the boards you don't neccisarily need them if you can back-pin or solder on a takeoff point of your own.

When it comes to...
Forum: Troubleshooting TVs and Video Sources 10-28-2013, 09:48 PM
Replies: 12
Views: 3,648
Posted By kingsapper
Re: LG 50PS30 Z-sustain questions

Update:
Both of the STF20NF20 NMOSFETs appear to have gone short-circuit. Spare parts have already been ordered, we'll see how things go. Oddly enough the FDP51N25 seems to be fine. I may...
Forum: General Electronics Technical Discussion 10-25-2013, 05:02 AM
Replies: 38
Views: 5,569
Posted By kingsapper
Re: bad power very VERY bad power! dont want server damage

All the more reason to run a real file system like ZFS :d

Enterprise power supplies in real servers are built pretty hard-core. And most modern servers have dual redundant power supplies that are...
Forum: Troubleshooting TVs and Video Sources 10-25-2013, 04:38 AM
Replies: 12
Views: 3,648
Posted By kingsapper
Re: LG 50PS30 Z-sustain questions

I'm doing failure analysis on the three MOSFETs listed on the repair kit you guys put up over the weekend. That will give me the failure mode, which will send me in the right direction hopefully. ...
Forum: Troubleshooting TVs and Video Sources 10-24-2013, 03:37 PM
Replies: 12
Views: 3,648
Posted By kingsapper
Re: LG 50PS30 Z-sustain questions

Panel model is PDP50H30001

Good news about the document being more in depth. Maybe it's just the tech in me, but if something breaks I want to know why it broke and prevent it from happening...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-24-2013, 05:30 AM
Replies: 2
Views: 1,478
Posted By kingsapper
Re: How to sweep test an IF filter

doesn't appear that the source and load impedances are matched.. what's the working impedance of that filter?
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-24-2013, 05:26 AM
Replies: 33
Views: 35,045
Posted By kingsapper
Re: warning!xcelite flush cutters!

In my opinion...

Cutters (Diagonal, flush, etc) should be sharp and well cared for. If you use them improperly they will damage things of course, but if you use dull banged up cutters or try and...
Forum: Troubleshooting TVs and Video Sources 10-24-2013, 05:00 AM
Replies: 12
Views: 3,648
Posted By kingsapper
Re: LG 50PS30 Z-sustain questions

I have the service manual for the 50PS30 which does not mention the Z-sus at all really.. I was expecting more out of a "service manual" it was actually a bit disappointing. Thanks for the point to...
Forum: Troubleshooting TVs and Video Sources 10-24-2013, 04:29 AM
Replies: 12
Views: 3,648
Posted By kingsapper
Re: LG 50PS30 Z-sustain questions

Ok, that being said I just took a closer look at the datasheets on those two MOSFETS.. if this is a well known issue does anyone know why these parts blow up? The manufacturers are reputable, so I'm...
Forum: Troubleshooting TVs and Video Sources 10-24-2013, 04:18 AM
Replies: 12
Views: 3,648
Posted By kingsapper
Re: LG 50PS30 Z-sustain questions

Much appreciated for the assistance. I've got a developer's account at a few places so I'll look into the parts and order replacements. I've gotten quotes in the neighborhood of that ebay price for...
Forum: Troubleshooting TVs and Video Sources 10-24-2013, 03:41 AM
Replies: 12
Views: 3,648
Posted By kingsapper
LG 50PS30 Z-sustain questions

Hi All,

I have a LG 50PS30 in near-mint condition given to me by a colleague in it's original packaging (!). On startup it was black screen, but the LED indicator blinked red then went solid...
Forum: Announcements & Related News 10-24-2013, 02:46 AM
Replies: 21,732
Views: 1,287,024
Posted By kingsapper
Re: New Members - please post your introductions here

Hi All,

I'm a qualified Electronics and Communications Systems Technician with many years of tinkering before getting a qualification.. Background in communications systems and...
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