Re: Manually Degaussing a CRT


The colour in the problem area looks to be magneta in colour, suggesting the blue and red pixels are being affected.

I would think with a degaussing issue that you'd see colour images around print characters in that area. Can you get gray scale printed characters in the area at a low resolution?

The manual for your HP suggests there are dynamic colour and convergence adjustments (page 14, 15) that affect different regions of the screen. Seems to me that may be the issue rather than an overall convergence problem...

Re: Aliexpress oscilloscope....good idea/bad idea ?



That's true to an extent but it all comes down to how you intend to use it.

If you want to do serious digital work, you may need a multi-channel scope with storage facilities. Depends how complex the digital circuit might be.

If you want to watch parallel digital signals, like on a buss, to check for timing, you may need 8 - 16 channels.

If you want to capture a glitch, you'll need a scope with an amp that can catch the glitch and maybe a storage scope to capture it....

Re: Asus k52f short

No point shutting down a good thread that is unresolved. If this can be solved, it will teach me a lot about the ins and outs of laptop mobos and their peculiar power supplies.

I've had several experiences with people who have taken over old threads, or newsgroups, and thought they owned them.

No fear of me going there.

Re: Asus k52f short

re liquid damage are you referring to me or original poster?

I was given the Asus laptop knowing it was damaged and not working. I am skilled in electronics and received it as a challenge. I have done crazy things in the past like taking a hard drive apart to see why it was not reading. I had to learn a certain amount of Russian since that's where the expertise could be located.

Different strokes for different folks.

Although the laptop is old, it has an Intel i7 processor which appealed to me.

I did...

Re: New Members - please post your introductions here

Thanks for allowing me aboard.

I have decades of experience in electronics, computers, and the electrical field. I refer to myself as a jack of all trades and a master of none. That's because technology has accelerated so quickly over the decades in electronics and computers that it's pretty hard to claim one is an expert.

Right now, I'm working on an Asus K52jr system. Those in the field would suggest I am crazy but I enjoy working at chip level. I do it purely for interest, not to save money....

Yes...but did that fix the problem with the blown power board?

I have the same problem, pretty well exactly. Blown, JMC251, the K1 LED driver and the lid switch IC, which is a Hall Effect chip.

I am approaching this differently, it's an odd one. The symptoms point to an over-voltage condition and quite an over-voltage considering the degree to which the JMC251 was toasted.

I have loads of experience in electronics and I don't feel good working blind. Therefore I am tracing the pertinent circuits to see what I'm dealing with. As someone indicated earlier...