HonestFlames
New member
Have you tried pressing firmly on each of the ROM chips? They do work themselves loose eventually and can cause the kind of problem you're looking at.
A1200 no picture...
- Thread starter AmiNeo
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JACK98
New member
just curious,wonder would a hairline crack on the board cause any problems?
Hmm, thats something i hadnt considered but i did try pressing down on the chips when i first got it on a whim incase something was loose. Once ive got these caps replaced ill give that a shot if its still not working.
---------- Post added at 20:05 ---------- Previous post was at 20:03 ----------
Hmm, just found a pad under one of the caps that was probably not making contact with the board it lifted off with the capacitor, no resistance whatsoever...
Im guessing its been corroded... looks black where the solder isnt on it...
---------- Post added at 20:34 ---------- Previous post was at 20:05 ----------
any way anyone knows of to correct this? solder to the channel etc??? I fear this may have been the problem
---------- Post added at 20:44 ---------- Previous post was at 20:34 ----------
It seems that wasnt the only pad that has loosened considerably, ive discovered a couple more that havent completely detached but have lifted on one side.
HonestFlames
New member
Ouch, sounds like a world of troubles. The only way I know of fixing damaged tracks is to trace the track to where it goes and bung an ugly wire between the two things it should be connecting.
ChrisUnionNJ
We Will Never Forget..
Hey Zetr0
You got to do a pdf book of your repairs and mods it would make reading alot
Easer to follow when were doing one of your repairs...
Chris
You got to do a pdf book of your repairs and mods it would make reading alot
Easer to follow when were doing one of your repairs...
Chris
Y'know Chris,
Thats sounds like a great idea, it could be called a "Hardware Hacker Compendium" I can gather working hacks from all over the world a throw'em in an online-downloadable pdf for the Hack@Home <--- whoa.... Hack@Home and Hardware Hackers Compendium... thats two brain waves in as many minutes.... I better sit-down..
Thats sounds like a great idea, it could be called a "Hardware Hacker Compendium" I can gather working hacks from all over the world a throw'em in an online-downloadable pdf for the Hack@Home <--- whoa.... Hack@Home and Hardware Hackers Compendium... thats two brain waves in as many minutes.... I better sit-down..
Ah okay Z. Shes yours anyways now, was just curious if she ever got up and running again.
JonathanDrain
New member
I too have an A1200 that gives no video output
I too have an A1200 that gives no video output
I too have an A1200 that gives no video output.
Over RF, I get black screen and no sound. Over composite (yellow/white/red to SCART cable), I get a black screen, but the sound works normally. I don't have an RGB video cable to test it. I can hear the Frontier intro music, which suggests everything is working normally except video out.
There's something odd on the motherboard, too: someone has soldered the RF modulator and the composite connector at some point. They've replaced the yellow composite jack with a white one like the audio RCA audio connector.
Any idea what this fault could be, or how to fix it? Would an RGB cable work or could it be some larger video fault? (They're ~£17 on Amigakit and that's a lot of money for something that might not work.)
I too have an A1200 that gives no video output
I too have an A1200 that gives no video output.
Over RF, I get black screen and no sound. Over composite (yellow/white/red to SCART cable), I get a black screen, but the sound works normally. I don't have an RGB video cable to test it. I can hear the Frontier intro music, which suggests everything is working normally except video out.
There's something odd on the motherboard, too: someone has soldered the RF modulator and the composite connector at some point. They've replaced the yellow composite jack with a white one like the audio RCA audio connector.
Any idea what this fault could be, or how to fix it? Would an RGB cable work or could it be some larger video fault? (They're ~£17 on Amigakit and that's a lot of money for something that might not work.)
Hmm... My first instinct here would be to blame the capacitors responsible for the video output. Although with you mentioning the boards outputs having been altered I'd be looking more closely for bad connections and such. It's possible that the output has been badly connected to its place.
with no picture on the RF/Comp then its one of three problems
1. VIO (feed) Capacitor(s)
2. CXA1145 (RGB to Luma Croma) *feed RF and Composite
3. DAC (Digital to Analog converter)*
Recently I got smaked in the face with three boards with the latter DAC failure. since you have NO picture from either RF or Composite, I am leaning towards either a feeding capacitor to the DAC or a DAC failure itself.
While the caps are cheap and replaceable, the DAC generally isn't.... irony would have it, for an Uncommon component, its a common fault on some issue motherboards.
Sadly there are as many revisions of DAC as there are revisions of motherboard, each one needing the right version...
I wish I could bring better news.
1. VIO (feed) Capacitor(s)
2. CXA1145 (RGB to Luma Croma) *feed RF and Composite
3. DAC (Digital to Analog converter)*
Recently I got smaked in the face with three boards with the latter DAC failure. since you have NO picture from either RF or Composite, I am leaning towards either a feeding capacitor to the DAC or a DAC failure itself.
While the caps are cheap and replaceable, the DAC generally isn't.... irony would have it, for an Uncommon component, its a common fault on some issue motherboards.
Sadly there are as many revisions of DAC as there are revisions of motherboard, each one needing the right version...
I wish I could bring better news.
