Need help for basketball scoreboard (double digit up/down counter)

[patrick_marin]

sir to clarify, should i connect the +pin of the test LED to pin16 and -pin of test LED to pin8?

OR

should i just connect +pin of test LED to pin16 and -pin to ground?

i think i dint get your instructions sir, sorry for that.

 

[patrick_marin]

I think you mean the test LED is OFF when connected to the #8 pins, I hope!


EDIT:
Now do this test.
View attachment 41110

pin 3 4 5 of LS47 are +

 

[ericgibbs]

sir to clarify, should i connect the +pin of the test LED to pin16 and -pin of test LED to pin8?

OR

should i just connect +pin of test LED to pin16 and -pin to ground?

i think i dint get your instructions sir, sorry for that.

hi,
Connect the test LED cathode to the 0V line as before.

Use the test lead from the resistor to check pins 16 , which should light the LED

When you touch pins 8 the LED should not be lit because its 0V.

OK.

 

[patrick_marin]

got it sir.. all pin 16 are ON while all pin 8 are off

 

[ericgibbs]

got it sir.. all pin 16 are ON while all pin 8 are off

OK,

When the power is ON to the PCB, do you see any of the NUMBER LED's lit.?

Tell me what you see.

 

[patrick_marin]

hi,
When you have done the pins 8 and pins 16 test, look at this image and do this test.

View attachment 41109

pin 5 = ON
pin 4 = ON
pin 11 = ON
pin 14 = OFF

PCB ON= displays 0 0

 

[ericgibbs]

hi,
Next test.


EDIT:
As you can see the '00' this test is not required.!

 

[ericgibbs]

hi,
From these tests the counter should be working!

What is the power supply.???

 

[patrick_marin]

im using 7805 9v to 5v sir

still not working sir, what can you suggest? redo the entire circuit and redo the tests?

 

[ericgibbs]

im using 7805 9v to 5v sir

still not working sir, what can you suggest? redo the entire circuit and redo the tests?

hi,
In what way have you built it differently to the first time.
Is a new pcb or project board.???

Give me 10 minutes to work out the next test.

I will get back to you.

EDIT:
Look at this image.
Disconnect pin #7 on the LS247, you should see 1 displayed on the number LED

 

[patrick_marin]

hi,
In what way have you built it differently to the first time.
Is a new pcb or project board.???

Give me 10 minutes to work out the next test.

I will get back to you.

im using project board sir

 

[ericgibbs]

im using project board sir

Look at my last EDIT.

Whats your location.?

Can you post a clear picture of the project board.?

 

[patrick_marin]

i disconnected pin7 and 1 is displayed on ones digit

i dont have a good camera sir to post my project, im in manila

 

[ericgibbs]

i disconnected pin7 and 1 is displayed on ones digit

i dont have a good camera sir to post my project, im in manila

hi,
That quick '1's test shows that the LS247 is working and the LED to that LS247 is connected OK.

So the problem is somewhere on that first LS192 , the one near the 74LS14, check around that IC.

 

[patrick_marin]

ok sir, ill be checking again that ic.

btw sir, is a low battery will affect the counting? or will it still count?

 

[ericgibbs]

ok sir, ill be checking again that ic.

btw sir, is a low battery will affect the counting? or will it still count?

hi,
It depends how low the battery volts are.? but it could cause the circuit to fail.

Try a new battery.

 

[alexandrebraghin]

This scoreboard is exactly what I want to do, where can I found the full scheme? in the end, worked?

thanks

 

[ericgibbs]

This scoreboard is exactly what I want to do, where can I found the full scheme? in the end, worked?

thanks

hi,
Look here for up/down counters.
https://www.electro-tech-online.com...asic-3-digit-led-decade-up-down-counter1.html

 

[alexandrebraghin]

this one: **broken link removed**

is it the scoreboard or time counter?

 

[ericgibbs]

this one:

is it the scoreboard or time counter?

hi,
As the input are manual switches, how could it be a time counter, unless you push the 'UP' button every second.??

To add 1 to a score you push the UP button once, to deduct a 1 you press the DOWN button,,, to Reset the count to Zero , all '00's use Clear