Por JimGR
Rookie (28)
27-10-2011, 11:56
Hi, after replace of capacitors in 8020, opens with a black screen and the caps lock led is on (maybe some time contacted some ground from keyboard). My ROM is faulty ?
Por Jipe
Paragon (1594)
27-10-2011, 12:23
check the solder and if you have breaking a wire !
27-10-2011, 12:27
I checked and everything is ok, the problem is stable....
27-10-2011, 14:56
your 8020 working fine before replace the capacitors ?
27-10-2011, 21:39
Yes and after replacing capacitor working, but one ground from keyboard, touch it to U20 and ... all black
27-10-2011, 23:50
Sorry, U29 not U20....
28-10-2011, 07:13
if your philips 8020 is a /00
the IC U29 is a 74LS273 and is the printer port , you can change it
but if you have broken a D0 to D7 signal change U23 74LS245 , is the buffer D0 to D7
only if your model is a 8020/00
28-10-2011, 08:42
Yes it is 8020/00, (U29 is 74SL273) but the printer buffer can able to stop the signal screen? I will take out the chip to see if turn on the screen?
28-10-2011, 09:56
if you have broken a Data Signal D0 to D7 the MSX don't start
28-10-2011, 16:28
I did order from eBay the two 74SL and I expect to come, in a few days I will have news!
14-11-2011, 13:12
I replaced the U29 and U23 and the problem still remain .... black screen only ....
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