Tempest monitor repair log – WG 6100 color vector monitor rebuild
Status: FIXED
Repair cost: About $50
KLOV Post: http://forums.arcade-museum.com/showthread.php?t=98417
Symptom: Monitor dead. Original 6100, fireworks on deflection board, R100 burned through.
Diagnosis: Low voltage section of deflection board is toast. Perform cap kit, install LV2000, concentrate on chassis transistors & power transistors on deflection board.
Fix:
- 08/02/2009 – Installed cap kit + extra parts, LV2000. F100 & F101 blow immediately after powerup.
- 08/18/2009 – Replace diodes, transistors on LV2000. Replace blown (underrated) D100-103 with 6A2 diodes. Replace Q603/Q703 on frame.
- 08/24/2009 – Learn, inspect work, double-check, triple check…smoke test tonight. Deflection board fixed – we have monitor chatter, but only half a picture.
- 09/17/2009 – F600 now blowing on powerup. Replaced blown Q606. Powers up and runs for about 5-6 seconds with vertical line before F600 blows again.
- 06/25/2010 – Replaced all frame mounted transistor sockets with new ones. Monitor now powering up. Issue with Tempest boardset (link), monitor verified working with another color vector game.
Notes:
The frame-mounted transistor sockets were most likely causing intermittent/bad connections from the corroded and weakened leafs. The intermittent connections were eventually leading to the transistors shorting out, causing a domino effect of other parts to fail, or a fuse to blow. Every time a fuse would blow, the proper thing to do would have been to test all the transistors (on the frame and deflection board) for shorts before continuing. Replacing all 6 sockets eliminated this issue.
Eventually, the culprit parts were the MPSU07/57 power transistors on the deflection board. These parts are very expensive and/or hard to find, but I bit the bullet and replaced them all, which fixed the problem.