Recent content by Dion

Update: i found that the 12v line comes from AN7812 @QF04. The input voltage is just wrong, it dropped around 11volts. I guess i will have to check the power circuitry again. So far replacing the feedback opto have no effect.

I have 2 monitors with same symptoms, flyback looks not working, but HOT is presumably ok, since it is not shorted. I have checked the power supply section, all voltages out are all availables. before HOT, there is somekind of transformer driving it. I checked for ac voltage both sides...

I think i found it. It surge absorber, reading the texts on the body looks legit too.

Googling for spark gap, i found nothing alike. Digikey too, nothing.

Just a quick question, photo attached. That thing that is like an old neon indicator lamp. Thanks in advance 🙏

So i have this twin cyber cycle that have some part of the graphics bad, like shown in the photos. I have narrow down the problem source to be the mrom pcb problem. is there any tricks to know which chips are bad? Thanks in advance.

Just fyi, used that table esr check to replace mine, now it is working, before the screen is wavy badly(horizontally) around the center. Now it is fixed like a new. Thank You. This is the list of caps replaced : C457 10uf 50V C456 10uf 50V C455 10uf 50V C956 10uf 50V C459 22uf 50V C458 22uf...

Ah, didn't notice that before. Thanks.

So, the dark blue is the ones esr checked bad?

You wouldnt believe what i found. After so many days figuring out, i found the problem, well, you cant really say it is problem per se, but the culprit were the resistor divider in the rgb input. The resistor was placed around the marked area. Each color line has 2 resistor divider. Now, i...

DY /yoke cable socket problem?

I have adjusted it to the best, before i took the photo.

Hi, i have nanao in a sega cab which have this symptom. When you use crt test and choose the grid test, the vertical lines is like weaker/more dim than horizontal lines. Anyone know what causing this? Btw, i have recap all electrolytes cap in the board, and it nothing changes. Thanks

according to this, copy would be useless. sorry for my ignorance.

i know this is a bit old post, but i have encounter such error because of the vga card. We had both japanese and asia version which use different vga card type. i accidentally used another one and result in that very error.