Sir nate72 . . . . . .(are you really 72 YO . . .or only going on 50'ish ? )
Mark up Photo . . . . . . . and . . . . . Concept of Circuit Design . . . . . . as per my perception . . .
( Frame . . . . . 24 K gold foil flakes and Brazilian Rosewood . . . hand rubbed )
HOLY MACKERAL . . . . dere Andy ! this boards opaque white reeeeeeeeee-sist is on par with a Macbook's damn BLACK resist covering, one can't make out its underlaying foil traces
ANYwhere . . . only the vias !
This is a job for your multimeters lowest ohms function . . . to detect direct connections.
SINCE . . . . .we need to know about a couple of direct connections.
I am seeing the 5 VDC power supply coming into the USB connector and feeding the RED BOXED in circuitry, which uses U3 and rings L1 inductor and D1 back EMF rectifier , to then up vert that 5 V DC input, on up to 24-30'ish volts DC to be then stored in E-cap C6 at the very bottom. That powers up the LED LIGHT strips.
That power then us routed up to individual sets of U4 and U7 LED controllers ( BLUE BOXED) for your WHITE and OFF WHITE LED illumination strings.
They keep their operating voltages and current control in check.
An educated guess is that the individual very bottom . . .
YES . . .
Pulse Width Modulated control lines coming in at the very bottom, will then route up to ?R3?R8? and R17 and pass upward out of them to the separate bases of Q6 and Q5 transistors (VIOLET BOXES) . They will then respectively and proportionately control the two strips of ILLUMINATOR LED's.
HOMEWORK . . . .
Get metering and place in its lowest ohms range, short the meter probes to see what the display reads, when being as a full / dead short connection.
Move over to the UNPOWERED AND UNPLUGGED light unit to measure from the bottom incoming Pulse Width Modulated connections and see if they are then routing up and direct connecting into the bottom connections of those just referenced resistor pairs. Then see if their top connections don't then route up to the bases of Q5 and Q6 control transistors ?
Next, we need to see those transistors positons within the circuitry, the most logical would be for the emitter of those transistors to go to ground. Measure from either emitter down to bottom E-caps right ground lead of C6, to see if there is direct connection..
ARE the emitters going to ground ?
If so then you just need to differentiate as to which transistor controls the off White LED light string and disrupt / open its driver transistors base drive voltage .
AND as hard as that . . . . . white resist encased . . . . . foil trace might be to locate, I, myself, would go for having my mini SPST switch mounted and then , have its wiring then shorting out base drive with a connection to the
EASILY accessible base and emitter of that involved driver transistor.
73's de Edd . . . . .
I was wondering why the Frisbee coming at me kept getting bigger and bigger and BIGGER . . . . . but then it hit me.
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