Funhouse G.I. Problem (SOLVED)


By provato

4 months ago


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  • Latest reply 4 months ago by ChrisHibler
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#1 4 months ago

Hi there, once again I'm in need of an expert opinion on a problem I have with my fh pinball.

Problem: front playfield G.I. Strings (white-violet) burn the 5v fuse (F106) every time I turn the machine on.

History: all G.I. Was working fine on my machine (I have LEDs from comet installed) until Suddenly while playing the front playfield G.I. (Including coin door) turned off. I opened the backbox and found out that f106 tripped. I replaced the fuse but unfortunately it tripped again once I turned on the machine.

Diagnostics I've made so far: 1. I checked all lamps & wiring of the white-violet gi string. Everything seems perfect. 2. I checked to see if any soldering point was connected to ground. No such thing. 3. I Checked for continuity between the fuse holder edges on the Pcb (fuse off - machine turned on). The multimeter gave me a strange sound to my surprise!!! I turned the multimeter to measure VAC between the fuse holder's edges and it showed me 4,7 Volts AC!!! 4. I disconnected J119 & J121 which contained the white-violet G.I. Strings and now I don't have any voltage across f106 edges!

My thoughts on solution: maybe the triac Q12 shorted out??

Please guys I'm in desperate need of advice what to do next....
Thank you!

#2 4 months ago

The triac isn't shorted. They rarely fail.
It's more likely that the GI lamps on the coin door are shorting, perhaps to the lockdown bar lever. Remove J119 and retest.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://www.PinWiki.com - The new place for pinball repair info

#3 4 months ago

I have the lever wrapped in electrical tape (as suggested in flippers.be) so I'm pretty sure they are not shorted (plus I checked with my dmm)

Anyway, I removed the small j119, turned the game on and... Tripped f106 again... good thing I have many 5a/250v fuses

#4 4 months ago

I had the same problem a couple of years ago. After adjusting the coin door lights everything went back to perfect

#5 4 months ago
Quoted from MeNaCeFiRe:

I had the same problem a couple of years ago. After adjusting the coin door lights everything went back to perfect

By adjusting you mean...?

#6 4 months ago

The bulb base was shorting out w the coin door

#7 4 months ago

Ok here's what I tested now: I disconnected all coin door cables from coin door interface PCB and also disconnected j119. Still fuse trips

Edit: the only way the fuse does not trip is if BOTH j119 and j121 (that have the white-violet string) are disconnected from power driver pcb

#8 4 months ago
Quoted from provato:

Ok here's what I tested now: I disconnected all coin door cables from coin door interface PCB and also disconnected j119. Still fuse trips

It's a board problem then. Probably a bad transistor.

#9 4 months ago

I'm not very bright with schematics.

Any idea which transistors are involved in this gi string? I'll check them one by one.

#10 4 months ago
Quoted from provato:

I'm not very bright with schematics.
Any idea which transistors are involved in this gi string? I'll check them one by one.

Not off hand, no. (game is at my grandmas for the family to play)

#12 4 months ago

Let's not indict the board yet.
Does the fuse blow with =just= J121 off?

If so, then you're going to need to track that violet/white-violet GI string.
Where you look depends on whether you have the backbox or playfield GI connector attached to J121.
Fat wires go to the PF. Skinny wires go to the head lamp insert panel.
Review the violet string appropriately.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#13 4 months ago

There are gi bulbs under the apron, check that they aren't shorting.

#14 4 months ago

It could also be a shorted LED. LEDs are cheap and sometimes the leads inside can break loose and short together. I've seen it happen. Instead of burning through fuses test with a multimeter removing one LED at a time. This will allow you to trace down the short, provided it is indeed an LED or socket.

#15 4 months ago

Ok I'm at work now, give me a little time and I'll check the whole string again with dmm for shorts. Then I'll try turning the game on with no bulbs at all in the sockets, and I'll write back.

#16 4 months ago

PROBLEM SOLVED!!!! Thank you all you helped me a ton.

The problem was out of the pcb and in the g.i. string indeed..!

A lamp socket was shorted (its two legs were touching each other...). After I bent the legs outwards, f106 stopped tripping and all lights in the white-violet string are now lit!

See the photo I uploaded to see exactly where the problem was

IMG_3465 1 (resized).JPG

#17 4 months ago

Thanks for posting the resolution.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://www.PinWiki.com - The new place for pinball repair info

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