TNPA5623 schematic Panasonic needed

[dgewertz]

Re: TNPA5623 schematic Panasonic needed

I may cave and get the cheapy hot air rework station to pull the chip and not do any more damage...don't see how else to get to the solder under the IC.

Martino,
Just looked at your post again...do the red x's on your board mean no connection?

[meyerpflug]

Re: TNPA5623 schematic Panasonic needed

I purchased the SS Board Component Repair Kit from SJ but I messed up one of the pads on the IC (pin 4). I believe this is a ground but would like to verify this by checking the schematic/pinout for this IC (BD8694 1521). Can anyone provide a datasheet for this chip or a better mfr/part number? Google searches do not bring up anything worthwhile using keyword BD8694.

[badly]

Re: TNPA5623 schematic Panasonic needed

I had a similar issue with a missing pad for the IC. Can confirm that the TV functions when pins 4 and 5 (the left hand side two) are left not connected.

Pins 1-3 can be wired pretty much straight upwards on the board (assuming you're only missing the pads themselves and not the trace above them).

Pin 8 likewise can be wired straight down.

Whereas pins 6 and 7 at the bottom are both wired into the same trace below that runs all the way to the R051 resistor that you no doubt are also replacing, so just attaching to anywhere along that trace should get you up and running.

Remember that you also need to attach the thermal pad at the back of the chip to the board below.

[bkeltm]

Re: TNPA5623 schematic Panasonic needed

For others with pad damage: it appears to work with end pins (4&5, shown w/ X's in pict) not connected. For me, pad 4 came off with chip, pad 5 while i was scraping the charred board between pins - it just jumped off the board. After scraping around and finding no traces, and based on this page, put the chip on w/ those legs dangling. TV has been working for an hour so far.
Reminder: bottom of IC152 is a metal plate that solders to the board.