820-3462 fu***d up?

[Glenn]

Have a 820-3462 card that i have change the smc on for some months ago. One day when i was surfing on it, it just shut down and nevere started again. I replace a condensator so now fan is spinning... but it's a lot more problems like, no pictures on screen, no chime, no backlight and it is beeping like no RAM is installed.

is this just a good donor card now?

I have ligt on usb mouse

 

[dukefawks]

What beeps? 1 beep or 3 beeps?

 

[Glenn]

1 beep. I also burn my finer on L7520 and L7630

 

[Glenn]

Guess it's nothing too fix on

 

[dukefawks]

Resistance to GND on both of those coils?

 

[Glenn]

L7630 d0.001 and L7520 0.001 (diode)

 

[dukefawks]

Both are way too low, something is fucked up. Inject voltage on L7520 see what heats up, I bet the CPU.

 

[Glenn]

Will tray that. Inject max 1,25v right?
if the cpu geting heat there is nothing to do right?

 

[dukefawks]

L7520 is 5V supply so 5V would be max. Just start low at 1V and see if anything heats up.

 

[Glenn]

ok. will tray it tomorrow and report. Thank you Duke

 

[Glenn]

Are you sure about 5v? I can only see 1.25v

 

[aprendiz]

L7520 and L7630 are for CPU feed always have a low resistance to ground, we just need to know how low is the resistance, be sure to measure resistance not in diode mode.......

 

[dukefawks]

Shit I was looking at the wrong schematic!

What is resistance to GND on L7630?

 

[Glenn]

i dont know the resistans right know. have remove booth was ready to inject voltage. but any way something is wrong on this trace since i burn my finger on booth off them. will replace them whet new one and report.