kgs@cunixb.cc.columbia.edu (Kok G Sang) (09/03/90)
My friend just fried his amiga 500 by accident. He used a serial cable instead of the monitor cable in his RGB port, and there was a spark. He's thinking of replacing the bad parts himself but doesn't know what's burnt. Maybe one of you readers can help. Here are the symptons: 1. There's no hand with the disk picture when the computer is turned on. 2. Both video ports are not functioning (RGB and RCA mono). 3. If he inserts a disk that plays music the audio is messed up. If it helps, he has the 1.3 Kickstart, and the old fat agnus. His commodore dealer asks for an outrageous price just to open the case! Thanks, -Kok
lkoop@pnet01.cts.com (Lamonte Koop) (09/04/90)
kgs@cunixb.cc.columbia.edu (Kok G Sang) writes: > >My friend just fried his amiga 500 by accident. He used a serial cable instead >of the monitor cable in his RGB port, and there was a spark. He's thinking of >replacing the bad parts himself but doesn't know what's burnt. Maybe one of >you readers can help. > >Here are the symptons: > > 1. There's no hand with the disk picture when the computer is > turned on. > 2. Both video ports are not functioning (RGB and RCA mono). > 3. If he inserts a disk that plays music the audio is messed up. > >If it helps, he has the 1.3 Kickstart, and the old fat agnus. > >His commodore dealer asks for an outrageous price just to open the case! > >Thanks, > >-Kok > > > Hmm...that sounds like one very unhappy system. It could be Paula giving the trouble, but something tells me it isn't going to be that simple. A more detailed explanation may illicit more help. UUCP: {hplabs!hp-sdd ucsd nosc}!crash!pnet01!lkoop ARPA: crash!pnet01!lkoop@nosc.mil INET: lkoop@pnet01.cts.com
<LEEK@QUCDN.QueensU.CA> (09/04/90)
4 Sep 90 01:56:02 GMT kgs@cunixb.cc.columbia.edu (Kok G Sang) writes: >My friend just fried his amiga 500 by accident. He used a serial cable instead >of the monitor cable in his RGB port, and there was a spark. Well... Due to the lack of info like what did he get on the screen - anything at all after that, which pins bears the marks of the spark... etc; I can't pin point the damage. Since the description is not too technical, I would advise you seek the help from someone who know about fixing computers. If you are willing to take the risk, these are the parts I would look at. The video port is driven by the Video Hybrid (HY1), 2 of the signals goes from the Fat Agnus chip (_HSYNC and VSYNC). My bet is on a fried Agnus since the music program don't work and (assuming) the video don't work either. Try to borrow/steal a old fat agnus chip for swapping from someone else who did the upgrade. If that fix the music program and not the video, then the second g damage is the video hybid. If the colour are messed up a bit, I'll also take a look at U40 and U41 (74HCT245). Note: Paula is isolated, so it is not the problem. If you don't know who to remove any of the chips, seek help from a C= repair centre. You are more likely to break things than fixing it. K. C. Lee Elec. Eng. Grad. Student