Dead TT

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Dead TT

Postby Cyprian » Sun Jun 17, 2012 10:50 am

Hi All,

three weeks after arrival my TT is dead. When I press power button, LED lights green, but there is no 'BEEP' sound and LCD's screen is black.
I disconnected all addons (FDD, HDD, Usatan, TT-RAM, CD VME) but TT still doesn't boot up. Also I checked LCD with laptop and it works ok.

Do you have any idea how to fix that?
thanks
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Re: Dead TT

Postby Zogging Hell » Sun Jun 17, 2012 1:01 pm

Is the yellow light for the disk drive access coming on? If not I'd check - power supply, memory and TOS chips first. How did it die (what were the circumstances)?
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Re: Dead TT

Postby lp » Sun Jun 17, 2012 3:23 pm

Sorry to hear this. I would check the power supply. You should get the standard AT voltages at the pigtails that go to the floppy and HD.
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Re: Dead TT

Postby frank.lukas » Sun Jun 17, 2012 4:37 pm

... use a Romport Testkit for the Atari TT !
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Re: Dead TT

Postby Cyprian » Sun Jun 17, 2012 7:46 pm

Zogging Hell wrote:Is the yellow light for the disk drive access coming on? If not I'd check - power supply, memory and TOS chips first. How did it die (what were the circumstances)?
no there is no yellow light. memory chips are soldered directly to motherboard, I pressed TOS chips but there is no any change.

How id died? I'm trying to code some effects for TT and now I'm checking videos hardware registers. I run STE video scroll test and TT just died :)

lp wrote:Sorry to hear this. I would check the power supply. You should get the standard AT voltages at the pigtails that go to the floppy and HD.

I didn't know that is standard AT power supply, I'll check voltage tommorow.

frank.lukas wrote:... use a Romport Testkit for the Atari TT !

unfortunately I don't have that testkit.
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Re: Dead TT

Postby Cyprian » Mon Jun 18, 2012 8:46 pm

ok, I've just checked the power supply and voltage and unfortunately it is consistent with standard AT voltage.

there is a battery on the board, my multimeter shows that is empty. is it normal?
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Re: Dead TT

Postby Dal » Mon Jun 18, 2012 8:55 pm

You can disconnect that battery, it's for the clock. However I'd be very surprised if it does anything to improve your situation.

What RAM do you have? You can try removing it, reseating it or swapping it (if you have spares kicking around?).

As Frank says, you could really do with a test cart - Try Nick Harllow (16/32), he may have a TT test cart. When you get it, you need to connect another machine to the serial port on your TT using a null modem cable (not sure which port?). Then a terminal emulator will be able to give an indication of what's not occurring.
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Re: Dead TT

Postby Zogging Hell » Mon Jun 18, 2012 9:06 pm

Cyprian wrote:ok, I've just checked the power supply and voltage and unfortunately it is consistent with standard AT voltage.

there is a battery on the board, my multimeter shows that is empty. is it normal?


As Dal says, and that happens a lot with second hand TTs. The general consensus suggests it will have no effect on your TTs performance or reliability.
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Re: Dead TT

Postby wongck » Tue Jun 19, 2012 1:06 am

Yes, my TT also had the clock battery dried out.
It still boots without proper time.
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Re: Dead TT

Postby Cyprian » Tue Jun 19, 2012 9:06 pm

Dal wrote:You can disconnect that battery, it's for the clock. However I'd be very surprised if it does anything to improve your situation.

What RAM do you have? You can try removing it, reseating it or swapping it (if you have spares kicking around?).

As Frank says, you could really do with a test cart - Try Nick Harllow (16/32), he may have a TT test cart. When you get it, you need to connect another machine to the serial port on your TT using a null modem cable (not sure which port?). Then a terminal emulator will be able to give an indication of what's not occurring.


TT-ram is unplugged and 2MB of ST-ram are installed directly on the board. I reseat all chips with sockets, but without success.
I have an idea that reset buttons is broken (I was using it very intensive that day), I need to check it somehow. Unfortunately I have no free time this week...
If it doesn't help I'll try to but that test cart mentioned by you.

thanks every one for your support
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Re: Dead TT

Postby Cyprian » Sat Jul 28, 2012 12:27 am

I'm more than happy, today my TT magically came to life : :mrgreen:
I replaced reset button with another one (from my old broken STfm) and thats all.
It turned out that button was broken and always pressed.
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Re: Dead TT

Postby wongck » Sat Jul 28, 2012 3:45 am

Cyprian wrote:I'm more than happy, today my TT magically came to life : :mrgreen:
I replaced reset button with another one (from my old broken STfm) and thats all.
It turned out that button was broken and always pressed.


[smilie=greencolorz4_pdt_12.gif] Great job !!
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Re: Dead TT

Postby Cyprian » Sat Jul 28, 2012 11:32 pm

thanks wongck, now I have to somehow extend ST-Ram. now I have 2MB
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Re: Dead TT

Postby Dark Willow » Sat Jul 28, 2012 11:50 pm

Glad to hear it's back to life :)

A good place to look for RAM boards for the TT is on Ebay.de - the TT was MUCH more popular there than anywhere else. You can usually pick up 16mb TT-RAM (fast ram) boards fairly easily, though usually unpopulated. It's a better investment than ST-RAM in most cases.
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Re: Dead TT

Postby Cyprian » Mon Jul 30, 2012 11:33 am

actually I have TT-RAM - Mighty MIC 32
but I'd like to extend ST -Ram, because demo TT-Highres by tSCc doesn't work on 2MB ST Ram :)
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Re: Dead TT

Postby simbo2 » Sun Oct 07, 2012 9:22 pm

if this happened to me i would closely inspect the mainboard for anything rolling around inside
Put an atari computer in your life and you will have a nice quiet time
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