msi cr400 - no display

[crazypepe]

hey guys

have a msi cr400 with no display
already replaced proadlizer capacitor with 4 x 330uf tantalum
but still no display
havent done a reflow yet but checked capacitors under the nvidia chip it shows 7 ohms? is that considered a short circuit?

also dont know if its related or unusual but when plugging in the charger, the led in the charging battery indicator flashes once and then once again after removing the charger

thanks in advance guys

[crazypepe]

Re: msi cr400 - no display

attached schematics

[lezsimply]

Re: msi cr400 - no display

what's your vcore voltage? you can check fddizon's thread, it might be same problem with your's.

[lezsimply]

Re: msi cr400 - no display

I forgot its not even powering, sorry

[atsio]

Re: msi cr400 - no display

What is the resistance of your meter probes, i.e. if you touch them for test?
What is the resistance under the nvidia if you remove the processor?

[fddizon]

Re: msi cr400 - no display

pepe,

before putting those caps, whats the status of laptop when powered on?

given:
-no display
-
-

[crazypepe]

Re: msi cr400 - no display

@fddizon
well thats about it, there is no display
no beeps no blinking lights no change on screen

@atsio
meter shows there is 7 ohms under nvdia chip

@lezsimply
vcore is 0.01

already removed the nec/tokin type capacitor and replaced it with 4 x 330uf tantalum capacitors but still no display

thanks for the replies guys

[atsio]

Re: msi cr400 - no display

meter shows there is 7 ohms under nvdia chip

I asked you what is the resistance of your probes if you touch them for testing (Asking to see if meter shows 0 Ohm).

7 Ohms is without the processor plugged in?

What is the resistance on PL3, PL4, PL5, PL6, PL7, PL8, PL9, PIN 1 & 2 OF PQ36 with processor and memory removed.

[crazypepe]

Re: msi cr400 - no display

I asked you what is the resistance of your probes if you touch them for testing (Asking to see if meter shows 0 Ohm).

7 Ohms is without the processor plugged in?

What is the resistance on PL3, PL4, PL5, PL6, PL7, PL8, PL9, PIN 1 & 2 OF PQ36 with processor and memory removed.

probes touching is 0 ohms

yes, 7 ohms is without processor plugged

resistancce of
pl3=303
pl4=821
pl5=0
pl6=850
pl7=223
pl8=1013

pl9,pq38 and pu11 are empty
but pins are there see attached photo

[fddizon]

Re: msi cr400 - no display

pepe,

page 28.
remove pl5 coil and determine which side is shorted to ground.
if on the right side, check components going in that direction
if on left, you know what to do

[crazypepe]

Re: msi cr400 - no display

pepe,

page 28.
remove pl5 coil and determine which side is shorted to ground.
if on the right side, check components going in that direction
if on left, you know what to do

thanks for the reply fddizon

but already checked all components out of circuit towards the direction of the short, i ended up below the vga chip mcp79mvl-b3
its like the line of +mcp79_core is shorted?..

thought it was normal because in your other post you said that the vga is short and still the 4 x 330uf capacitors worked right?

again thanks for your time

[fddizon]

Re: msi cr400 - no display

my apology to that. i use diode tester with sound, when it measures low resistance value, it beeps.
forgot to post reading of resistance.

your reading is 0 which means that it is shorted as if you short your two probes.

[atsio]

Re: msi cr400 - no display

To be 100% certain you have to remove and PU8, r257, r258 but my experience tells me that the problem is with the Media and Communication Processor (MCP), your conclusion.
You have to unsolder it and check of course first, if the short is gone on the board and secondly if MPC is functional.