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traindriver69

Received TI-99/4A weird thing on screen

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Hi all

Just received a TI99/4A and after plugging it in get this on the screen.

attachicon.gifpicture 1.jpg

And this

attachicon.gifpicture 2.jpg

anyone any ideas please.

many thanks

 

This is what your computer is trying to tell you:

@BHTTNF: D@R L@BHHND HRT NHBHT FDR FDRFHNFDRPNJDN TND LHTTDNFR@BDN. HRT D@RX RN@PPDN DDR RPRHNFDNVDRJ BLNVDNFTRDN, TND BNRJDNPNPPHN LHT RPHTZDNRP@RJDN. HRT NHBHT FDR FDVDRJDN BX D@R DTLPJNFDN. D@R RTBBDRNDBJDN RHFHTRDDRDN JDDPDN D@R H@NDR HN D@R PNBJDTR. RDL@XDN TND V@TBHDN D@R BLHNJDNLHFHTR.

 

 

Seriously, have a look here:
One of the 4116 R@Ms has failed. Specific@lly, U102 which is @ll the way over to the left by the joystick pnrt.
Replacing it will take some desoldering skills (this is a great way to start with electronics.)
Edited by FarmerPotato

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This is the basic screen

post-40858-0-50426000-1553787741_thumb.jpg

When in basic there are some white lines flashing interference on the screen and you can type the keys but what letter or number although readable does not reflect which key has been pressed.

 

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@traindriver69, if you do attempt to replace the relevant VRAM chip, be very careful not to compromise the integrity of those white vertical strips running across the top and bottom of those chips. They each house one or more bus bars integral to the motherboard’s circuitry!

 

...lee

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Hi all

I have got hold of some dram chips and dip sockets and have unsoldered the first chip by the joystick socket but like an idiot I forgot to take a picture to see which points need soldering to where.Has anyone got or able to send me a picture with a close up of the back of the board at that point so I can double check what needs soldering to where.

Many Thanks

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