Recent content by BennehBoy

Declaring interest.Declaring interest please. 1xTF1232 -128MB RAM -50Mhz FPU -Buffered IDE -UK Signed for £187.50

Hi if anyone has a spare A500 KB in the UK please drop me a PM. Happy to buy or trade for either of the following: A500 RGB2HDMI with HDMI extender ribbon and 3d printed side cover (no RPi included) (tested working) Eyetech 4 Device buffered IDE Interface (untested)

Received 2x ESD protection sets. Thanks.

I've now replaced the flip flop and I still have a resistance short on R3 - any ideas anyone? I'm a bit stumped with my novice fault finding skills.

Want a working 1541 ALPS mechanism read write head - just the head, may consider the whole mechanism if the price is right. Thanks.

Done this and there's no longer a partial short, so there's no issue with the PLCC socket. I'll solder the flip flop back on and see what gives - there's no internal short between pin 1 (GND) and pin 4 (R3). EDIT - soldered it back on and no change.

I think I'll remove the flip flop with hot air and see if R3 still shows 75ohm to ground.

OK, so there's 75ohms resistance showing between R3 and ground on the adapter... R3 has good connectivity to U3 pin 4, but there's still 75ohm to ground from that pin. Has the flip flop gone bad? It worked originally, at no stage have I had this powered whilst the plcc wasn't clipping on well...

Looks to me like the high red bit is NC or tied to 0 (not sure if that would be high or low on denise). Didn't bother with kickstart as this screenshot says it all... Apologies if this shows huge.

Tested connectivity and that's fine. Pics below, the side next to the 28mhz crystal is the worst in terms of denise alignment, but all the pins are solidly anchored. top side bottom left - some flux residue that I need to flush right - hardest to photo due to the close crystal

Without the adapter plugged in DB23 image is normal. I'll take some pics & check continuity after work - thanks.

Reflowed denise, still got a blue cast. Denise seems to be misaligned front to back about a third of a pin width - so my theory is that potentially some pins could be getting bridged. Here's the sequence of events: Board arrived, would not stay clipped on. Sanded board and it stayed on -...

Ha, I'm now getting a blue/purple colour caste with the adapter fitted, both on HDMI & on RGB out - I suspect one of the denise pins has a corroded/cracked solder joint which the adapter is pushing away from the main board when it's clipped on. It's all fun and games with these old machines -...

I looked very closely under my scope and the left hand side was slightly less sanded - a few passes on low grit paper levelled things off and it's much better now.

I'll give that a go, cheers. There doesn't look to be any excess plastic from the pin tops when looking at it under the scope though...