Star Wars WG6100 yet again...

Hi,

I have had this cab for just about 2 years, it is in my favourite top 3 but is by far my most unreliable cab, in the beginging it was gameboard faults, but i battled my way through these, then AR II probs but i rebuilt this and did the sense mod, Then things started to go wrong in the HV section and so i re-capped it and replaced each component as it failed, then things started to go on the deflection pcb and so i did the same to that, re-capped it and replaced the bits as they failed, sometimes it would live for a week sometimes a couple of months and sometimes only a few hours, i repeatedly checked the voltages for ripple, but everything was always ok. I added grounding wires between the monitor cage / game pcb / ARII / power brick. So far on the deflection pcb i have replaced all the transitors, some of the resistors and nearly all the diodes, i posted recently about a diode that kept dying in the LV section and a thread came and went about the LV2000.
  The main problem was it kept losing its HV, and blowing that diode in the LV section, so i took the HV cage out again checked the transistors mounted on the outside and found the BU409 didnt meter correctly, so i replaced this and just as a matter of cource replaced the other external transistor at the other end of the cage both with new mica's and heatsink compound. Turned it on and it works, leave it on for about 3 hours play it here and there and then put the cab back in the line up, turn it on again and after 5 mins it goes blind again, i turn it off and leave it half hour, turn it on again and it works, so i stand there and watch it and after another 4-5mins the image grows (blooms?) for a couple of secs and then dissapears, i'm guessing this is down to the HV dropping off as it fails (is it correct that lower HV causes blooming ?)
 To me it has to be either a component breaking down under load or a bad connection as things warm up, anyone else had this kind of problem with a WG6100 ? Do the flybacks go intermitantly faulty or do they die only ? To say that this has become a bit frustrating is an understatement. Any idea's greatly recieved....

Pinx

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Received on Sun Sep 10 15:09:58 2006