Another Samsung: HP-S4 25 plasma - Clicks

[tvrescue]

Apparently this is a common problem, but I can't seem to find any guides that follow through to a solution. Any help will be appreciated.

Problem: won't turn on. Relay clicks over and over.

I opened the sucker up, but I couldn't find any problems visually. No burns, cracked boards, or melted pieces. No swollen caps or leakages. So I did the voltage test.

My readings for Va, Vsc, Vs, Ve, and Vset all check out. As well as the D5.3V and STB-5V pins. All voltages are good.

I saw a post on this website that says to check the PS-ON pin for fluctuations. Ah-ha! We have a winner! This pin fluctuates as the tv goes through the relay cycle.

Im still not sure what the source of the problem is, nor how to fix it. I have soldering experience so that wouldn't be an issue.

Any advice?
Thanks

[tvrescue]

Re: Another Samsung: HP-S4 25 plasma - Clicks

Bump

[mmartell]

Re: Another Samsung: HP-S4 25 plasma - Clicks

Main board. Something might be pulling it down after it starts up.

[mmartell]

Re: Another Samsung: HP-S4 25 plasma - Clicks

Pull the pson pin from the connector and meter it. Does it still fluctuate ? If not problem is on PS

[tvrescue]

Re: Another Samsung: HP-S4 25 plasma - Clicks

Pull the pson pin from the connector and meter it. Does it still fluctuate ? If not problem is on PS

I tested the pin and it still fluctuates. Note: the fluctuation occurs when the clicking happens.

What else can I try?

[tvrescue]

Re: Another Samsung: HP-S4 25 plasma - Clicks

I've tried testing the y and z sustain by unplugging them and turning on the tv.

The only thing I notice is when I unplug the z sustain, I get a split second of red blue and green pixels, and then a black screen. When I unplug the y sustain, I don't get these pixels, only a black screen.

Edit: just noticed the thread title has the wrong model. The correct one is Samsung HP-S4253. For some reason I can't edit the original post.