VAR00 LA-9201P short to ground

[bjhawfam]

Re: VAR00 LA-9201P short to ground

took voltage reading at the location shown in the attachment and get 19v...

[caspian]

Re: VAR00 LA-9201P short to ground

B+_BIAS is pin1 of PQ3 and also pin1 of PC11.
it is different from B+. I think you measured B+.

[bjhawfam]

Re: VAR00 LA-9201P short to ground

These are the measurements I took from pq3 and pq4? These are the voltages prior to pressing the power... After pushing the power button the 5 volts drops to 0.00 and the 19.6 volts drops to 0.5....

[caspian]

Re: VAR00 LA-9201P short to ground

do you get any beep or blink code after turning on?

[bjhawfam]

Re: VAR00 LA-9201P short to ground

not at all,,, after replacing the ribbon cable and the UL indicator board I get no beeps and the LED's dont light up... I know the board receives power, theres just no beeps or LED codes... Prior to that I did get the 7 beeps from the speakers...

[caspian]

Re: VAR00 LA-9201P short to ground

something is faulty on the board that makes the laptop to turn off.
But it is not figured out yet.

[caspian]

Re: VAR00 LA-9201P short to ground

now open page45 of the schematics and measure the following points after turning on:
PCH_PWR_EN , PCH_PWR_EN# , SUSP, SUSP# , SYSON , SYSON#

[bjhawfam]

Re: VAR00 LA-9201P short to ground

okay i get
0volts PCH_PWR_EN before power and 0volts after power is pressed
0volts PCH_PWR_EN# before power and .3volts after power is pressed and it drops immediatly to 0.00 this was at qz15 on page 45,, pin 3 gets 5valw...
SUSP = 0 volts
SUSP# = 0 volts
SYSON = 0
SYSON# = 0

[caspian]

Re: VAR00 LA-9201P short to ground

now you would better reprogram the EC bios.
this may solve some problems of your laptop.
then we go forward to solve the remaining problems.

[bjhawfam]

Re: VAR00 LA-9201P short to ground

Sounds good ill pull both chips and reprogram them both

[caspian]

Re: VAR00 LA-9201P short to ground

It would be better not to change the main bios if it is on a different IC.
make a backup of the main bios first.
If you reprogrammed EC and got no result, then you can attempt reprogramming the main bios.

[bjhawfam]

Re: VAR00 LA-9201P short to ground

no problem I always make a backup regardless... Thanks and ill be back in a few.

[bjhawfam]

Re: VAR00 LA-9201P short to ground

I tried looking to purchase the file and cant find it,, I'm assuming u2 and UH1 would need programming...

[caspian]

Re: VAR00 LA-9201P short to ground

it is uh14.
probably you don't need to buy.
search Dell's website.
the main bios can be found in the following page:
https://www.badcaps.net/forum/showthread.php?t=53269
other technicians may provide the EC firmware here.