Configured like this?
View attachment 355174

i had connected the LED On the emitter side. in addition, i had added hard wires to take of the error in my schematic drwg copied from You tube. pl. excuse

 

i had connected the LED On the emitter side

OK then like this:

Lets talk about why the LED on the pcb is always ON.

 

OK then like this:
View attachment 355177
Lets talk about why the LED on the pcb is always ON.

just want to make my point of communication clear as far as possible. The schematic given for receiver, with LED , Uses s8550 pnp trans . In that, when the pin 3 goes high, the LED IDEALLY MUST Not glow,

wHERE AS the one you had put, pin 4,7,10, are the triggering outputs( expected and goal of the project).
Hope i am making it clear.

I am not sure why the LED is always on, that must not be case. i checked if the 8550 damaged, but, no. So....

 

I am not sure why the LED is always on, that must not be case. i checked if the 8550 damaged, but, no. So....

Do you have a volt meter to get some readings on that 8550 transistor?

 

Do you have a volt meter to get some readings on that 8550 transistor?

yes i did. with the transistor in pcb and also a normal transistor. from collector to emitter it has a continuity. on the reverse side, it does not have a continuity. meaning. it shows a four digit value when i measure it with diode setting. when i measure it on the rev. side it shows 1. My only pain is not sure what i do, or what is happening. the pin 3 of 4017 shows high. but, the LED is glowing too.

 

yes i did. with the transistor in pcb and also a normal transistor. from collector to emitter it has a continuity. on the reverse side, it does not have a continuity. meaning. it shows a four digit value when i measure it with diode setting. when i measure it on the rev. side it shows 1. My only pain is not sure what i do, or what is happening. the pin 3 of 4017 shows high. but, the LED is glowing too.

whats a "normal" transistor you mention ?
when people ask for some readings, they hormaly mean what actual voltage are you seeing at certain pints with respect to otheres. being you getba glow, the signal is either not h / l, or its pulses,

 

whats a "normal" transistor you mention ?
when people ask for some readings, they hormaly mean what actual voltage are you seeing at certain pints with respect to otheres. being you getba glow, the signal is either not h / l, or its pulses,

sorry had I miscommunicated. I reviewed the set up once again. to feed it 5v( 4.95 to 5.1v). the LED Is on always, In the IC4017, I am not clear for what reason, the pin always is in HIGH State despite a low trigger on pin 14.
As i said, earlier, the transistor if open, may lead to possible path to LED. Upon checking the continuity between emitter to collector and i do not see any issue. hope i clarify. added a picture too.

 

My only pain is not sure what i do, or what is happening. the pin 3 of 4017 shows high. but, the LED is glowing too.

I need you to get voltage readings on this transistor in the circuit in order to properly troubleshoot.
Are you sure the transistors are installed correctly?
I see a jumper missing from the negative side of the 100uf capacitor to pin15 on the 4017, shown in BLUE on this image of the pcb.

 

I also see a capacitor from the collector of the 8550 to ground.
This capacitor is not on the schematic and not needed and probably damaged the transistor which is causing the problem.

 

I need you to get voltage readings on this transistor in the circuit in order to properly troubleshoot.
Are you sure the transistors are installed correctly?
I see a jumper missing from the negative side of the 100uf capacitor to pin15 on the 4017, shown in BLUE on this image of the pcb.
View attachment 355208

Sir, i beleive the jumper is the green line going to pin 15. hope the picture explains. as you said i took the readings on emitter, collector and base. the continuity and HFE values. i believe my conclusion on S8550 is ambiguous still. the voltages also i measured. the voltage on the emitter pin was 4.94, the collector pin was 4.75, the base was 4.9, for a VCC OF 5.01 VOLTS.

 

I also see a capacitor from the collector of the 8550 to ground.
This capacitor is not on the schematic and not needed and probably damaged the transistor which is causing the problem.
View attachment 355211

Yes, sir, that was a mistake on the tracks, i left it bare, not added any cap. there. Thank you very much.

 

i believe my conclusion on S8550 is ambiguous still. the voltages also i measured. the voltage on the emitter pin was 4.94, the collector pin was 4.75, the base was 4.9, for a VCC OF 5.01 VOLTS.

That transistor is defective and should be replaced.
Again that 100uf cap shows no connection from the negative side of the cap to pin 14 in your layout.

 

That transistor is defective and should be replaced.
Again that 100uf cap shows no connection from the negative side of the cap to pin 14 in your layout.

ok sir!!
-"Again that 100uf cap shows no connection from the negative side of the cap to pin 14 in your layout".
I wish and pray you saw the picture i attached pl.

 

I wish and pray you saw the picture i attached pl.

I have several times.
The green line shows the connection from the emitter of the 2N2222 to pin15 but I see no connection from pin15 to the negative side of the cap.
The green line should connect to the purple line to complete the circuit correctly.

 

I have several times.
The green line shows the connection from the emitter of the 2N2222 to pin15 but I see no connection from pin15 to the negative side of the cap.
The green line should connect to the purple line to complete the circuit correctly.

ok sir. i got it, i removed the track , sorry. just understood. thank you.

 

ok sir. i got it, i removed the track , sorry. just understood. thank you.

SIR, Upon check, i tried measuring ic4093 inputs to debug from beginning. the pin 3 in ic4093, gives 1.6 to 1.8 volts that i saw in multimeter. not sure why. but 4093, has to gvie a low or high value only not inbetween random. any issues be there pl.

 

Hello,

Can it be that the 1 uF capacitor on the output of the 4093 creates a to heavy load?
What is the purpose of that capacitor?

Bertus

 

The cap is there to filter out noise.
But I would add a 10K resistor between the output of the 4093 and pin14 of the 4017.
Replace the 1uf cap with a 0.1uf cap from pin14 of the 4017 to ground.

 

SIR, Upon check, i tried measuring ic4093 inputs to debug from beginning. the pin 3 in ic4093, gives 1.6 to 1.8 volts

What you are measuring might be noise from the output of the IR receiver module.
Try my suggestion in the previous post.
Do you have access to an oscilloscope?
BTW did you get the 8550 replaced ?
Is the LED Off now when in the standby mode?

 

What you are measuring might be noise from the output of the IR receiver module.
Try my suggestion in the previous post.
Do you have access to an oscilloscope?
BTW did you get the 8550 replaced ?
Is the LED Off now when in the standby mode?

yes sir, i did, when i measured in pcb and i found it erratic. and changed. but, is not the case when i rechecked the removed rogue( (pl. xcuse) transistor. i added my comments in the picture. Now, i am going to excavate the ic 4093 and replace it.?? i thank you for your meticulous guidance as a pal and an SME.