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(Topic ID: 261445)

Burned bulbs...why?


By Pinballark

9 months ago



Topic Stats

  • 7 posts
  • 6 Pinsiders participating
  • Latest reply 9 months ago by Atari_Daze
  • Topic is favorited by 1 Pinsider

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#1 9 months ago

Hi
How comes that the bulbs in my Space Invaders often goes black and burned out? I guess it' because of too high current, but how can I fix it.
Most often in the bumpers...both the active 3 and the passive 50-points.
/Thanks

20200207_143547 (resized).jpg
#2 9 months ago

LED the GI and be done with it.

LEDing the controlled lamps will require an addon or replacement board.

#3 9 months ago

Those areas where the bulbs are closed in seem to turn black and I think it has to do with the buildup of heat rather than an over current problem.

#4 9 months ago

I would put LEDs into the pops. Those lights frequently burn out because of the vibration and heat. Not great for the caps either.

#5 9 months ago

This is because the bayonet socket on pop-bumpers has a pretty crap design, and doesn't make good contact with the bulb. Over time, dirt/corrosion adds resistance to the connection, and the socket becomes loose, so this acts as a resistance between the bulb and the power-source. Resistance + current = heat, which cooks the bulb. A hot bulb will slowly evaporate the filament which then deposits metal inside the bulb, which causes the heat to build up even more. Result, is a runaway situation and a nice black/shiny bulb. This can happen with any poor socket, but the cover of the pop-bumper (which keeps the heat in) makes it even worse, and the poor design of pop-bumper sockets makes it doubly worse.

#6 9 months ago
Quoted from Dr_Dude:

This is because the bayonet socket on pop-bumpers has a pretty crap design, and doesn't make good contact with the bulb. Over time, dirt/corrosion adds resistance to the connection, and the socket becomes loose, so this acts as a resistance between the bulb and the power-source. Resistance + current = heat, which cooks the bulb. A hot bulb will slowly evaporate the filament which then deposits metal inside the bulb, which causes the heat to build up even more. Result, is a runaway situation and a nice black/shiny bulb. This can happen with any poor socket, but the cover of the pop-bumper (which keeps the heat in) makes it even worse, and the poor design of pop-bumper sockets makes it doubly worse.

That was great information...thanks!
Since the popbodies are built as they are, it's hard to get a newer holder with bulb inside unless pressed sideways.
Any tip on this?

#7 9 months ago
Quoted from Pinballark:

it's hard to get a newer holder with bulb inside unless pressed sideways.
Any tip on this?

try this:

https://pinside.com/pinball/forum/topic/vids-guide-to-rebuilding-pop-bumpers#post-485893

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