Pin 12 on CN1 is a candidate for being burnt. Clean all the pins and if you cannot get a replacement socket, tighten the female pins in the socket so they grip the pins better to reduce heat build up.

Just had the same thing on a Jurassic Park

Skippy2904

Bit of a long shot. I have been posting on the DE JP thread asking for some help with a video problem and am wondering if this might be a more general Data East problem.

I have 2 scenarios that lead to the same symptom. The symptom is that the video in the top 3/4 of the screen gets frozen.

The first scenario is after playing a ball or two, the trex in the skill shot stops moving across the screen and the video clips for modes or going into the control room stop showing as the display may be stuck on the current score or whatever.

To narrow things down, the second scenario is to turn the game on from cold (ie left for several hours), start a game which plays through the game start video and then the skill shot comes up. To start with, the trex moves backwards and forwards across the screen. After a random period of time, the trex just stops.

What has been done:
- rebuilt the power supply board with new caps (c1, c2, c3, c4 x 4, c7), bridge rectifier, VR1 and the 2 caps near it,
- cleaned up CN1 as pin 12 was a little burnt
- reflowed all the pins on the power board
- had the power board, mpu, dmd board and dmd screen checked by a board repair chap who had them running on a test rig. All he found was the mpu rom was corrupt, so burnt a new one
- replaced the dmd board power supply molex and reflowed the pins on the board
- ribbon cables were checked as being ok
- removed CN4 on the mpu (18v supply to the control lamps) to see if reducing the power demand stopped the symptom. It did not, even after replacing VR1 on the power board, the video freezes with this CN4 connector removed
- visually checked all the diodes on the playfield. All are connected, none look damaged.

Latest thoughts are that there is a loose wire or a dry solder joint on a pin connector. Where to start.

With the game video frozen, I have tried removing the dmd power supply and refitting. This did nothing. Removing the small ribbon cable and replacing, you can sometimes see that the video has refreshed, but is still frozen at a different place, ie the trex has moved.

Has anybody experienced a similar issue on a Data East game? Does not have to be JP. My thought is that with the same board sets being used, this issue is probably not game specific. Just a hunch.

Thanks in advance
Skippy2904

You often do not see the leak until you remove the original cap. Had the same thing with a JP recently. In addition to changing the 4 caps mentioned previously, check the fuse holders as they can break / crack. May be check the bridge rectifier too.

Have a look thru the DE JP thread as there has been lots of discussion on there.

Good luck

Skippy2904

Edit see you already did post on the other thread!