hansm@dutesta.UUCP (Hans Mulder) (04/19/88)
My Mac-128, upgraded with new roms, 2Mbyte, and a SCSI port (both from Levco) exhibits a strange hardware problem. Occurence: The Mac is functionally correct, but has vertical, thin, equally spaced, lines accross the screen, which originate on the top and descend from barely noticible to the full length of the screen. The length of the lines varie when the floppy, or harddisk is active. There are approximately 2 to 3 lines centimeter History: First occurence is in the summer of 1986, and it only happens when the Mac is cold. Generally after 5 minutes the problems disappear. Over the year the problems become slightly worse, and in the summer of 1987 the occurences are much more serious (the lines are longer), it takes longer before they dissapear, and sometimes don't disappear at all. December 1987, the Mac becomes close to unworkable (the lines run from top to bottom and make the characters on the screen unreadable). December 1987, the Mac is moved from the US to Europe and now runs on 220V (via a transformer) and 50Hz. The Mac still functions but is unworkable, and is brought to a Mac repair shop. The Mac is repaired: the flyback, the picture tube, and deflect unit are replaced, and the power supply (the original (128k) one) is repaired. A couple of days later the problem reappears and now includes high pitched noises from within. The Mac is returned, the flyback is re-replaced and the Mac works perfectly again (2 days continuous in the repair center). A couple of weeks later (very light use, a few hours per week), the problem reappears. The Mac is returned to the repair center (last week) and I am waiting to pick it up. Question: What is the real problem? apparently the problem disappears temporarily when the flyback is replaced, but the cause doesn't. Was it really necessary to replace the picture-tube and deflect unit? When I get the Mac back from the repairman, I'd like to understand the real cause to avoid getting screwed. Any ideas or solutions appreciated. Hans Mulder mcvax!dutesta!hansm
Fabian_Fabe_Ramirez@cup.portal.com (04/28/88)
Hans, I would recommend that you give Keith at Levco's Technical Support a call. It is possible that there could be something wrong with your MonsterMac upgrade. Levco can be reached at (415) 457-2011. Fabian Ramirez SuperMac Technology fabian_fabe_ramirez@cup.portal.com sun!cup.portal.com!fabian_fabe_ramirez
Fabian_Fabe_Ramirez@cup.portal.com (04/30/88)
Hans, Oops....Levco's phone number is (619) 457-2011. Apologies for any confusion. Fabian Ramirez SuperMac Technology fabian_fabe_ramirez@cup.portal.com sun!cup.portal.com!fabian_fabe_ramirez