Dead TT

[Cyprian]

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

[Zogging Hell]

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)?

[lp]

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.

[frank.lukas]

... use a Romport Testkit for the Atari TT !

[Cyprian]

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

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.

... use a Romport Testkit for the Atari TT !

unfortunately I don't have that testkit.

[Cyprian]

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?

[Dal]

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.

[Zogging Hell]

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.

[wongck]

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

[Cyprian]

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

[Cyprian]

I'm more than happy, today my TT magically came to life :
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.

[wongck]

I'm more than happy, today my TT magically came to life :
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.

Great job !!

[Cyprian]

thanks wongck, now I have to somehow extend ST-Ram. now I have 2MB

[Dark Willow]

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.

[Cyprian]

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
http://www.pouet.net/prod.php?which=52339

[simbo2]

if this happened to me i would closely inspect the mainboard for anything rolling around inside