Sir partyanimallighting . . . . .
Why 'soitanly . . . .here is a run down of what is being seen, using your 9 initial and 3 updated photos.
On the first set of photos . . . #3 . . . on jpeg-45635 . . . . serves me best.
I am seeing an octet of 50 ohm loading / matching resistors, relating to the 16 bare header pins at the top right of the board . They are associated with the in / out interfacing of the LED 7 seg display and control pots on the offboard communications board of the very first photo, showing it being plugged in, along with the LED PAR board.
In its proximity, I also see the central / edge located WHITE 3 pin molex that mates with the 75176 line commnications chip that would permit 2 way serial digital interfacing into the STS u/p chip.
I see that you are not using that input, but the first one that I mentioned .
Top left corner, I see the top electret microphone element , with its black cloth windscreen.
ALSO I see a LM358 to its right, which would relate to analog audio processing into the u/p, so that this unit would also have the option of audio pick up and modulating the LED displays to have a "LIGHT ORGAN" display capability, modulating in unison with the picked up music.
There is being a BLUE 500K trim pot that is too high to be related to the to be mentione SMPS below , so its rotor must route up to the 1ufd block ceramic cap for pot wiper noise filtering and then to the 51K and into the LM358 for mike sensitivity adjustment for the "LIGHT ORGAN" mode of use.
On the left just below the mike we see the component cluster of a switch mode dedicated power supply with its associated ringing inductor , rectifier and E-capacitor for a dedicated Minus 5 volt power supply.
On my initial photo sightings, I could not make out the variant of that LM25XX chip, as for its being variable or fixed value voltage output . . . . now its seen as being minus 5.
Traveling across the board to the right, we encounter the six sections within a flat pack 74H*C04. It appears to be the interfacing between the systems STC608AD-5V *** u/p and the four POWER LED drivers circuitry.
Now I need
YOUR eyes for inspection and some info retrieval.
Look at the area between the left side of the u/p and the 7404 and you will see :
At the very top, you see a silver via, to dissapear to the other side of the board for its foils completion path.
Then a foil path that runs to the left to get out of any further viewing, by being blocked by the white 10K silk screen symbolization.
The third foil seems to take a hook down and connect right into pin 1 of the 7404, which is a valid inverter input, as is being confirmed by the chip pinout, being placed below.
The next foil goes right into a silver via to complete its path on the other board side.
Then there two final foil paths at the bottom which route underneth the 7404, and I am unable to see.
The output ports of the u/p should go into a pin 1-3-5-9-11 or 13 of the 7404.
While the solely needed 4 output ports of the 7404 should be pin 2-4-6-8-10 or 12. The opted for / utilized 4 connections should go to the to the 4 vias that you see just in the foreground from the 7404 which has a quad resistor pack with its 4 side by side 1K resistors within it.
Confirm if I don't then see the left resistor sneaking under the large E-cap to its left and ending up at the pin 5 input into the RED driver IC chip.
The second resistor in that pack makes a quick route down to the pin 5 input into the GREEN driver IC chip.
The third resistor in that pack makes a sneaky under and around the large E-cap to its right and down to the
pin 5 input of the BLUE driver IC.
The fourth resistor makes a vewy-vewy round about trip, eventually getting to the pin 5 input of the WHITE driver IC.
NOW . . . they seem to have initially assigned the board markings as " 240K " cryptic shorthand for these 4 drivers board markings.
I see no similarities in the ???? markings ???? on the cases of those IC's with that cryptic 240K, so I'm guessing that a production change altered the part # being finally used. . . . . AFTER PC bare boards were already fabricated.
With my best enhancement if the most visibly marked IC case , I agree with 6 characters being present on the first line.
One usually expects the second line typically being proprietary manufactiring data, akin to plant, shift, date code, etc.
I cannot get /relate to your 6 digits identification of the unit.
It looks more like a 5 or S, then a Q or O or zero, then agreeing on the possible two 9's , but the next item is not a vertical up and down slash as an I or 1 would be.
Then the final charactewr looks like a skinny zero or a skinny stylized backwards D .
Laser cut etching is universal for these markings . . . . except stamp pad bogus manufacturers.
What I think has happened, is that the conformal coating has filled in the laser cavities flush and made the contrast then being absolutely minimal.
OPTIMIZED IMAGE . . . . Mystery "DRIVER" I.C.
Try HARD pressing a Q- tip wetted in denatured alcohol / or / Paint thinner / or / Lacquer thinner / or / Methy Ethyl Ketone / or / Xylene / or / Acetone / or / Naptha ( aka Ronson lighter fluid) / or / Brake cleaner / or / Fuel injector cleaner . . . . . . . types of more aggresive solvents and rub vigorously to see what takes the conformal coating off and leaves you with a thwen relatedly more contrasty and readible marking.
No problems, with your now confirming the POWER FET's used as being N channel POWER FET's by INT RECT
SUMMARY . . . . .
Your swapping the driver iC's between the RED and GREEN with no changes confirmed both of them being OK . . . . if the GREEN then still operated O.K.
So you can disregard my suggestion of lifting and cross swapping the driver output connections between the gates of the RED and GREEN power FETS. You have already effectively accompliahed that test.
Now we have to sort out, if the problem is being the signal into the drivers from the u/p thru the 7404 stages
OR if the output of the 4 POWER FETS to the associative 1 inductor, 1 E-cap and 1 diode sets that are used within the
separate 4 stages to that WHITE Molex pin connector.
What you might do now is power up the unit and monitor at the top of the resistors in the resistor packs four 1K resistors with a DVM set in AC voltage testing mode and swing that colors adjustment pot thru its range.
E.G. . . . . . I'm expecting that if you monitor the top of the second 1K resistor for GREEN info, that you will get a measurable reading at MAX CW pot position and a decreasing one at MID pot position.
Then step a resistor to the right for BLUE info and then for WHITE info and expect all of them to read similar and FINALLY move back to resistor 1 and see how its reading compares to the three normally functioning
ones previously tested.
If that last test differs, we work on that , if being the same as the three others, we concentrate on the power outputs 4 components.
* Details
* 74H*C04 recheck that IC and expect it to be a misread, and NOT to be a N, but a HC instead, at the speed this unit is being expected to work at.
*** It's 8051 design based and this unit is clocking at 24 Mhz
BTW . . . . .
Very 1st photo . . . . very top light cluster at 12:00 position . . . . now drop down one position.
??????? What happened there, some GOOBER try to snuff out his cigarette butt , there ?
Or do you have outdoor use and an insect nesting problem ?
73's de Edd . . . . .
I was born by Cesarean section . . . . . but not so you'd notice. . . . . It's just that when I leave a house, I go out through the window.
