WG 6100 LV2000 burnt up

mtp66

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My five year old was playing my Tempest/MH conversion the other day and I could smell something burning. A few seconds later he screamed that the screen went black. I pulled the back cover off and I immediately noticed that the LV2000 light on the deflection pcb had burnt to a crisp. Also blew fuses f100 & f101. Before I go ahead and replace the lv2000 with a new one I would like to know what may have caused this ? Any ideas ?
 

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I just checked all the chassis mounted transistors I found a bad 2n3792. It is shorted between the emitter and the collector. I wonder if this was the cause ?
 
Which 2N3792 is it? If its the one the lv 2000 uses then possible. But check the big 4 diodes between the fuses also.

Andrew
 
Which 2N3792 is it? If its the one the lv 2000 uses then possible. But check the big 4 diodes between the fuses also.

Andrew

Yes it was the 2n3792 that the lv 2000 used. All of the large diodes check out ok. I pulled out the monitor and replaced the bad 2n3792. Jeff has told me that he will be sending me a replacement. It appears that one of the tantalum capacitors on the LV2000 blew up. Not sure if it went first then took out the 3792 or the other way around. Once the replacement part comes in I will let you guys know how I make out. Hopefully nothing else is cooked....
 
Update, after replacing the LV2000 with a new one and replacing the bad chassis transistor the monitor worked for about 10 seconds and then went out again. Spot killer is on, all fuses on deflection pcb are good, both lights on LV 2000 are on, I have neck glow and the game does play blind (checked with another working 6100) I pulled the deflection pcb and checked chassis transistors again, they all check good. I have also reflowed solder on the header pins.

Could the LV2000 have flaked out again ?
 
I had this happen recently. Zero B+. Turns out a pin on the big connector had backed out...
 
If your spot killer is on, your deflection board is still messed up. Check all the frame transistors and connections. Fire up the monitor with the HV disconnected, and unhook one of the output transitor connectors..( Red connectors) If you still hear deflection, then turn off, swiitch which output is connected, then try again.. That will help you narrow down if an axis isnt working.
 
So now instead of about $1 worth of parts being burned up he has a $30 dollar circuit board burned up ?

Back in the day those chassis mounted transistors were $30ea for 16's and $25ea for the 92's. I wish we had something like the LV2000 back then. I guess it would have been called the "LV1983" though! LOL!

Those monitors were always on my bench back in the day. Ugh...
 
If your spot killer is on, your deflection board is still messed up. Check all the frame transistors and connections. Fire up the monitor with the HV disconnected, and unhook one of the output transitor connectors..( Red connectors) If you still hear deflection, then turn off, swiitch which output is connected, then try again.. That will help you narrow down if an axis isnt working.

You were right, bad TO-3 socket on one of the chassis transistors. Replaced Q900 and I am back up and running. Thanks everyone for your help.
 
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