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Re: SpeedyTT, black screen of death !!!! HELP
Posted: 08 Jan 2026 02:58
by zfrenchy
here is the results of my testing, the red X are the continuity fail (red number are the test #, not the pin #)
Screen Shot 01-07-26 at 06.54 PM 001.PNG
Anyone know where is R950 is on the board ? I cannot find it.
Screen Shot 01-07-26 at 06.54 PM.PNG
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 08 Jan 2026 05:34
by HigashiJun
Ouch, that's pretty bad...
:(
Now you have to bodge wire all the missing connections.
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 08 Jan 2026 06:42
by frank.lukas
You need a professional electric vacuum desoldering pump and experience for this kind of work. It's a multilayer circuit board and therefore quite delicate. If in doubt, clip off the IC pins and desolder them individually using tweezers.
A manual desoldering pump is completely unsuitable.
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 08 Jan 2026 06:47
by Atarian Computing
zfrenchy wrote: 08 Jan 2026 02:58
Anyone know where is R950 is on the board ? I cannot find it.
You have a later revision TT that never had the schematics published by Atari. The only schematics available are for the PGA revision so there is bound to be minor differences.
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 08 Jan 2026 06:54
by zfrenchy
frank.lukas wrote: 08 Jan 2026 06:42
You need a professional electric vacuum desoldering pump and experience for this kind of work. It's a multilayer circuit board and therefore quite delicate. If in doubt, clip off the IC pins and desolder them individually using tweezers.
A manual desoldering pump is completely unsuitable.
I have a Hakko 470
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 08 Jan 2026 06:55
by zfrenchy
Atarian Computing wrote: 08 Jan 2026 06:47
zfrenchy wrote: 08 Jan 2026 02:58
Anyone know where is R950 is on the board ? I cannot find it.
You have a later revision TT that never had the schematics published by Atari. The only schematics available are for the PGA revision so there is bound to be minor differences.
Ok. Thx
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 09 Jan 2026 12:49
by 12-MHz
zfrenchy wrote: 08 Jan 2026 02:58
here is the results of my testing, the red X are the continuity fail (red number are the test #, not the pin #)
Hi zfrenchy,
it is best to re-solder all pins of the GALs and the 74LS74.
Anyone know where is R950 is on the board ? I cannot find it.
Yes, indeed. Look at the attached picture.
In some boards, R950 has a value of 33 ohms.
Best regards
Robert
IMG_6097.JPG
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 09 Jan 2026 16:21
by zfrenchy
12-MHz wrote: 09 Jan 2026 12:49
zfrenchy wrote: 08 Jan 2026 02:58
here is the results of my testing, the red X are the continuity fail (red number are the test #, not the pin #)
Hi zfrenchy,
it is best to re-solder all pins of the GALs and the 74LS74.
Anyone know where is R950 is on the board ? I cannot find it.
Yes, indeed. Look at the attached picture.
In some boards, R950 has a value of 33 ohms.
Best regards
Robert
IMG_6097.JPG
Can you shot to me another photo of you board top silkscreen including the region of the CPU ?
It will be handy to see the traces whitout the component.
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 10 Jan 2026 19:35
by zfrenchy
ALL FIXED, hoping not coming back here when I will install the SpeedyTT, Storm and LighningVME.
At the end, it was only some point to resolder, and a new budge wire between U11 pin 17 and U112 pin 2, no component damaged so far, will see after a while.
20260110_112737.jpg
Re: SpeedyTT, black screen of death !!!! HELP
Posted: 10 Jan 2026 21:36
by Icky
Glad you got it working again. Always a nervous time when we do work on these old systems and they stop working.
Let us know how you get on with the SpeedyTT, Storm and LightningVME.