![]() |
![]() |
#1 |
Registered User
Join Date: Sep 2004
Location: Tacoma, WA USA
Age: 52
Posts: 1,937
|
Amiga 1200 washed out video and flicker problem
Hi,
I was testing out my new ACA1221 today and got it fully licensed and wanted to see if it was going to be stable at 28Mhz. (From my trial tests it seemed to be doing fine), so I decided to copy a bunch of files to RAM: to fill it up and task the CPU and see how it would do. Came back later and machine was locked up, with LED flashing and screen looked washed out! I turned it off and then back on and now it boots up with the screen all washed out and colors look a little off, lot of PINK, and the screen also flickers/flips every every once in a while. Does it with Composite and RGB, see pics. The Car pic is RGB. Seems to work fine otherwise. So is this a big coincidence with the lockup or bad luck? Did I fry something? What can I check? ![]() Last edited by TjLaZer; 24 September 2015 at 08:19. |
![]() |
![]() |
#2 | |
Registered User
Join Date: Sep 2004
Location: Tacoma, WA USA
Age: 52
Posts: 1,937
|
Ran into a thread and saw this quote
Quote:
How can I make sure this is the problem and where can I get this chip? The chip I have is VP101 3BA. Last edited by TjLaZer; 25 September 2015 at 05:15. |
|
![]() |
![]() |
#3 |
Unregistered User
Join Date: Sep 2012
Location: Copenhagen / DK
Age: 44
Posts: 4,190
|
If something happens when you press on it, that would indicate a broken connection in that area. Maybe a pin on the IC has come loose from the PCB, or a track or via was damaged (usually due to leaking caps).
Your problem looks like you are missing the green channel and since it also happens on composite, the problem is located before the RGB signal splits to the RGB port and the CXA encoder. |
![]() |
![]() |
#4 |
Registered User
Join Date: Sep 2004
Location: Tacoma, WA USA
Age: 52
Posts: 1,937
|
The cap that is right above that looks like it leaked a bit, maybe it damaged some traces near the DAC... Yes when I press on the DAC, the screen jumps a little, but the color problem does go away, I do see it improve in that split second when the screen flips. So I am thinking it is a bad trace to the DAC!
|
![]() |
![]() |
#5 |
Ruler of the Universe
Join Date: Mar 2010
Location: Lanzarote/Spain
Posts: 6,196
![]() |
(Edited) So then try to resolder all of the pins of the DAC. Watch some video first to see how to make that if you've got a good soldering iron and you think you can do it.
Of course change all of the caps if just one has leaked. |
![]() |
![]() |
#6 |
Registered User
Join Date: Jul 2020
Location: Littlehampton
Posts: 32
|
Intermittent colour washed out and loss of a colour channel
Hi Amigas.
Is there a tutorial or some info on how to check and repair/replace this? My 1200Aga developed this very similar issue this morning 10.06.2023. It was a recap by AmigaPassion in Jan 2020. So the capacitors should be golden. See pics for chip. Thanks for any help. Last edited by AmigaDunc; 11 June 2023 at 10:44. |
![]() |
![]() |
#7 |
_Repair_Nerd_
Join Date: Jun 2020
Location: Germany
Posts: 71
|
Have a look here -> https://eab.abime.net/showthread.php?t=114763
|
![]() |
![]() |
#8 |
Registered User
Join Date: Jul 2020
Location: Littlehampton
Posts: 32
|
Thanks. Very interesting.
![]() |
![]() |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Amiga 1200 video problem | videofx | support.Hardware | 0 | 29 June 2014 01:31 |
Amiga 1200 Brightness Video Problem | mistermsk | support.Hardware | 0 | 09 December 2013 22:56 |
Amiga 1200 video problems | cyberfox_it | support.Hardware | 17 | 25 April 2011 10:20 |
Trade my 1200 flicker fixer for your 4000 FF? | batfatty | Swapshop | 0 | 18 January 2011 19:43 |
FS/FA: ICD Flicker Free Video/Scandoubler for Amiga 500,1000,2000,Toaster | vamigan | MarketPlace | 5 | 22 September 2007 02:37 |
|
|