Philips VG8020 black screen problem....

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By JimGR

Rookie (28)

Аватар пользователя JimGR

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 ?

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By Jipe

Paragon (1594)

Аватар пользователя Jipe

27-10-2011, 12:23

check the solder and if you have breaking a wire !

By JimGR

Rookie (28)

Аватар пользователя JimGR

27-10-2011, 12:27

I checked and everything is ok, the problem is stable....

By Jipe

Paragon (1594)

Аватар пользователя Jipe

27-10-2011, 14:56

your 8020 working fine before replace the capacitors ?

By JimGR

Rookie (28)

Аватар пользователя JimGR

27-10-2011, 21:39

Yes and after replacing capacitor working, but one ground from keyboard, touch it to U20 and ... all black Sad

By JimGR

Rookie (28)

Аватар пользователя JimGR

27-10-2011, 23:50

Sorry, U29 not U20....

By Jipe

Paragon (1594)

Аватар пользователя Jipe

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

By JimGR

Rookie (28)

Аватар пользователя JimGR

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?

By Jipe

Paragon (1594)

Аватар пользователя Jipe

28-10-2011, 09:56

if you have broken a Data Signal D0 to D7 the MSX don't start

By JimGR

Rookie (28)

Аватар пользователя JimGR

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!Smile

By JimGR

Rookie (28)

Аватар пользователя JimGR

14-11-2011, 13:12

I replaced the U29 and U23 and the problem still remain .... black screen only ....Question

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