Re: LOTR Power Problems
- From: "b__dakur@xxxxxxxxxxx" <basdakur@xxxxxxxxxxx>
- Date: Tue, 19 Feb 2008 17:26:23 -0800 (PST)
On Feb 19, 5:14 pm, "Coin-Op Cauldron (Clive)"
<Clivejone...@xxxxxxxxxxxx> wrote:
Mike Muglia wrote:
Somehow I knew you would chime in Lloyd. :) Thanks!
I checked the connectors at the transformer and all looks to be fine.
I didn't inspect the board that close when it came back because it was
repaired by trustworthy Clive.
Hi Mike.
You're probably not going to like this but it may save you a few hours
of work: The I/O driver board that was sent in for repair had all the
logic blown. In fact, +5v, D1 and D2 data bus lines were shorted to
ground throughout the board and none of the logic survived, this
obviously was a catastrophic failure. I believe that +50v was shorted to
the logic as the +50v fuse was blow along with the logic and no MOSFETs
or protection diodes were blown indicating a driver to logic short never
occured.
Some of the voltages you are listing having been measured *prior* to the
bridges (at the fuses) and are *AC* not *DC* so you are seeing an
incorrect reading. J16 will yield +5, +12 and -12 volts, with +18, +12
and +50v being indicated by the LEDs which you confirm are on.
Your best bet is to disconnect all the boards in the game except for the
AC into the I/O Power driver and measure the *DC* voltages at the I/O
board at confirm they are still present. Hopefully the short no longer
resides in the game and the I/O driver has not been damaged again.
The I/O driver was fully tested prior to release and functioned
perfectly and without error. There's a very good chance that if +50v was
shorted to the I/O driver that the CPU is now damaged (as was indicated
in a notification email to the customer). The migration would have
occured through the ribbon cable. Worst case, the short has propogated
through the system and taken out the CPU and display driver boards and
neither may now be repairable due to the use of CPLDs used on the board
as these *may* be damaged and are a custom programmable part.
Your may wish to check the resistance between +5 and ground test points
on the CPU. A low reading (less than 100 ohms) would indicated the +5
volt rail is being pulled down and would indicate a problem on the CPU
board.
Clive
---
Board repairs, EPROMs, servicing...
The Coin-Op Cauldron
103 Armistead Lane
Easley, SC 29642
(864)238-1707
http://www.coinopcauldron.com ;
All this because of a friggin $44.95 knocker mod..... no more
aftermarket "plug in" mods for me. I'll send you and email Mike
after I finish throwing up....
.
- References:
- Tech: LOTR Power Problems
- From: Mike Muglia
- Re: LOTR Power Problems
- From: Lloyd Olson
- Re: LOTR Power Problems
- From: Mike Muglia
- Re: LOTR Power Problems
- From: Coin-Op Cauldron (Clive)
- Tech: LOTR Power Problems
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