(347) 552-2258 [email protected]

820-4924 No chime/ no video

R

Ryanlen2

Member
Hello - This board came in dead with liquid damage around clock area. I replaced U1900/Y1905 and surrounding components and now I have 1.8V on PPVCORE. However I don't get a chime or video or light on USB mouse.
Also I do not have a scope so I cant measure frequencies sorry. Any help would be appreciated. Thanks!
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
Try new BIOS.
Check for corrosion around U6100.
Also check all SPI Bus Series Termination resistors, page 47.
 
R

Ryanlen2

Member
Hello -

Tried new bios - no change

0 corrosion around U6100

All SPI Termination resistors measure correct value and have continuity to related components.

Other things I have done -

Reflowed SMC, ran good flux under PCH/CPU and I tried replacing U1950. Still no change.


I also had to run a wire from C0890 to C1910 due to bad trace...

Should I pull SMC?

Thanks Again!
 
R

Ryanlen2

Member
USB mouse only lights when it is intially plugged in or unplugged. It never stays lit. l connected new internal KB to PRAM with no success. Only tried USB on the board, have not tried USB via I/O board...
 
Last edited:
R

Ryanlen2

Member
New bios came from donor of same board. It should still work just for testing, shouldnt it?
thanks again man .

????edit - when it first came in it did boot once oddly enough with chime and video then died and I lost Vcore. Replace parts, got Vcore then through in USC. Hasn't booted since...

You USC had something to do with it?


Take care.
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
Do not expect miracles from UC; too many times viceversa reported.
Do not use UC without real reason.
You could have broken trace, or some knocked off component now.

"Replace parts, got Vcore"
Did you test the board then?

"replacing U1950"
Don't do that again when VCORE is present.

Trying so many things will complicate the repair...
 
R

Ryanlen2

Member
Ok, I hear ya .
Yes, it booted once normally after "replaced parts, got Vcore". I thought it was fixed and put it in USC to get rid of flux. Then never booted again. This is when I found broken trace between C0890 to C1910. I have been checking for broken traces in the damaged area but everything seems to been out. So sorry for the confusion.
 
You must log in or register to reply here.
Top