Watch out for this one folks, just warning you'll because i got fooled. Symptom: No input selction or audio. All you hear is click click when you crank the volume control.
The BD3816K1 is mounted on a vertical pcb which plugs into 2 connectors on the main board. 1 connector supplies + and - DC along with data, clk, mute etc, the other connector has 5 channel audio outputs to main board. A few 8 pin smd op amps lie in the ics periphery.The vertical board has pcb mounted rca sockets for various audio inputs. I measured supplies, looked at data and clock on my scope and everything checked out fine. Two transistors in a TO92 package had "K429 A1266" and "K435 C3198" printed on them. I wrongly assume they're FETs and do an in circuit check for a shorted gate-drain, find none and move ahead. So i invested 25$ in a new BD3816K1 and replaced the old one. Naturally i'm shocked and desperate when i power up the set and find the same symptom. I've already quoted estimate and an anxious knot in my stomach has me thinking "oh god what if another ic which isn't available locally is the actual culprit , i'm doomed." I slip into depression , curse the woes of this trade , and decide to give it a last attempt before resigning myself to accepting another loss.I look up datasheets for 2sk429 and i find the package doesnt match, turns out the damn thing's a 2SA1266 with an open BE junction. The other being a 2SC3198, the K no.s printed on top in both cases. Seems like some leakage from another device connected to the cd input on board (it left a nasty scar near the rca socket)( i'll bet a philips....say what?) took out both the transistors. They are in series with + and - supplies. What is this transistor coding system that starts with K ?, have never seen it before. Jango