Hello all,


Working on my first C64 / Breadbin / 250407. Purchased as non-working. Getting black screen.


More detail below, but for those that want to get right to the question.... Here are a few waveforms comparing the Pin15 output on the VIC chip (luma/sync) to the pin 4 on the AV socket (composite signal).

https://imgur.com/gallery/PpqcqPY


My question is: Is the composite waveform range of 0.1v-1v too low for a c64?



More detail:


Symptoms are that that I get...

I have here a Magnum IA.100 which belongs to my parents.



The unit powers on & when the relay kicks in, you get a pop from the speakers (this might sound weird but is usual behavior for this amp). However, you get nothing coming through it from any of the inputs & no pops and crackls from any of the controls.


Because of the sound from the speaker when the amp turns on I have assumed that the output section probably works but I could be wrong & I'm not sure how to test that side of things further.


What Ive done........

Hello all... TV started boot looping. Opened the back panel and tried to isolate the problem. Just PSB no boot loop. PSB and MB no boot loop. Plug in the LVDS from panel to MB and boot looping starts up. It doesnt matter of order that I plug the LVDS ribbons back in, only 1 and no boot loop but as soon as 2nd one plugs in boot looping. I then noticed a flicker on the screen when I was closing the clip on the harness to the LVDS. Shut the lights off so I can see better, and I noticed as i slowly close it, I will get a picture, but as soon as it clips in, I lose picture and booting happens. So I...

​Hello

Laptop E15 I5 10gen
Mb nm-c421

I have a problem with the usb-c power dc.
The motherboard start only in one side of the usb-c

Replace the usb-c port 2 times same problem

With the usb-c meter, one side 20v ok, other side the usb-c meter don't come on

Try to test the pin with the Mechanic Tail insertion tester and every pin are ok ?

Can the pd controler be the fault ? Or something else maybe ?

Thx

...

Right SIDE usb.c port charges and transfers data without issue, two left side uSB c ports charge but do not receive or see data. Was liquid damaged, and repaired significantly and thought we were in the clear but appears this is the last issue that is rearing its head. I am trying to locate the RETIMER chip that communicates the DATA TX/RX but I cannot seem to find it on the schematic or maybe I am just so tired my eyes wore out lol. Any help would be great.