Alienware M14x R2 with 7 beeps error

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Got better contact with PL302 - 1.514V

PL102 - 18.96V
PL202 - 3.325V
PL205 - 5.12V

[caspian]

Re: Alienware M14x R2 with 7 beeps error

Got better contact with PL302 - 1.514V

PL102 - 18.96V
PL202 - 3.325V
PL205 - 5.12V

these voltages are all OK.
but I have to think more about PU701.
now measure voltage on PL402, PL504, PL505, PL303, and PL604 after turning on.
I hope we find the culprit soon.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Checkout how the keyboard lights react to the beeping and how the speaker sounds, it sounds like it doesn't have much power. Alienware light under the screen doesn't light up ether.
https://youtu.be/-gfgggpdlqc

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

these voltages are all OK.
but I have to think more about PU701.
now measure voltage on PL402, PL504, PL505, PL303, and PL604 after turning on.
I hope we find the culprit soon.

Well here we go... I had measured PL504 and PL604 in previous posts with 0V as well.

PL402 - 1.061V
PL504 - 0.0mV
PL505 - 0.909V
PL303 - 1.497V
PL604 - 0.0mV

[caspian]

Re: Alienware M14x R2 with 7 beeps error

now measure pin 1 and 3 and 7 of PU502 after turning on.
in addition, the voltage on PL503.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

now measure pin 1 and 3 and 7 of PU502 after turning on.
in addition, the voltage on PL503.

PL503 has no component from factory.
PU502 what is the pin order? second pic doesn't look too good or is it some sort of factory flux?

[caspian]

Re: Alienware M14x R2 with 7 beeps error

instead of PL503, measure voltage on pins 5-8 of PQ505.
yes, PU502 seems fluxy. anyway, please measure voltage on its pins 1 and 3 and 7 according to the attached picture.
all the measurements are after turning on.

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

PL503 has no component from factory.
PU502 what is the pin order? second pic doesn't look too good or is it some sort of factory flux?

why u are measuring pl503 and pu502?

pl503 get 18 volt for vram mosfet, and pq505 supply 1.5volt for vram.

if u disconnect pl503 pc works just fine with integrated intel video

The board is out of the casing as the components being tested are on the bottom of the board.

red light on power botton means nvidia vga (descrete vga) is working just fine. otherwise it will light up green or blue or other color; it depends of mainboard to mainboard.

check lvds connector on mainboard if its all ok.

when u first power on pc after beeing disconnected, ull get 5 beeps = bad cmos battery. just power offf and on again and the 5 beeps disappear. now if u get 7 bepps it means bad lcd or bad cable. try connecting an hdmi cable and that 7 beep shoud disappear..... if u get image on hdmi, then ill suppose bad lcd (u already changed lcd cable and i suppose lcd connector on mainboard is ok.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

instead of PL503, measure voltage on pins 5-8 of PQ505.
yes, PU502 seems fluxy. anyway, please measure voltage on its pins 1 and 3 and 7 according to the attached picture.
all the measurements are after turning on.

After mesuring PU502, I found puting a little presure on PU502 when booting would somtimes give:
1 beep, then 7 beeps repeat
2 beeps, then 7 beeps repeat
3 beeps, then 7 beeps repeat
4 beeps, then 7 beeps repeat
5 beeps, then 7 beeps repeat
6 beeps, then 7 beeps repeat

on multiple different boot tests.

PQ505
5 - 18.96V
6 - 18.96V
7 - 18.96V
8 - 18.96V

PU502 - pin layout as per your picture
1 - 24.2mV
2 - 0.0mV
3 - 13.1mV when not beeping, 13.4mV when beeping
4 - 0.0mV
5 - 0.0mV
6 - 0.0mV
7 - 5.12V
8 - 0.0mV
9 - 0.0mV
10 - 4.90V

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

why u are measuring pl503 and pu502?

pl503 get 18 volt for vram mosfet, and pq505 supply 1.5volt for vram.

caspian suggested.

red light on power botton means nvidia vga (descrete vga) is working just fine. otherwise it will light up green or blue or other color; it depends of mainboard to mainboard.

check lvds connector on mainboard if its all ok.

when u first power on pc after beeing disconnected, ull get 5 beeps = bad cmos battery. just power offf and on again and the 5 beeps disappear. now if u get 7 bepps it means bad lcd or bad cable. try connecting an hdmi cable and that 7 beep shoud disappear..... if u get image on hdmi, then ill suppose bad lcd (u already changed lcd cable and i suppose lcd connector on mainboard is ok.

caspian believes the Vcore has no power so the CPU won't have power which I would believe need to be fixed before other issues show them selves (if any), I get no output to any display no LCD, no HDMI and no VGA.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

I'm getting 0.0mV across PL703, PL704, PL705 with and without the LCD connected, so I'm not sure how I got the last readings, what should I test next?

My mistake here ^ , PL703, PL704, and PL705 are getting 0.9mV. I did not do it correctly.

[caspian]

Re: Alienware M14x R2 with 7 beeps error

now you did most the important tests and it is time to reach a conclusion.
the following voltages are missing on the board:
GPU_CORE, CPU_CORE, GFX_CORE, +1.5VSDGPUP
any advice and suggestions will be appreciated.

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

i see sometimes he write mv, but i see also 19mv where there sould be 19v so i think he write mv but he means volts. if so, 0.9 volts on cpu core is ok.

also:

1) cpu get hot when powered on?
2) vga nvidia get hot when powered on?
3) did u tried with an hdmi cable in the hdmi port ?
4) did u put a cmos battery in it ?

[caspian]

Re: Alienware M14x R2 with 7 beeps error

I guess the main problem is PU701 or the components around it. there may be a short there. This guess may be wrong though.
Now with the AC adapter disconnected, temporarily remove the CPU from the board and check resistance to ground on pins 25,26 of PU701. and also on PL703.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

i see sometimes he write mv, but i see also 19mv where there sould be 19v so i think he write mv but he means volts. if so, 0.9 volts on cpu core is ok.

also:

1) cpu get hot when powered on?
2) vga nvidia get hot when powered on?
3) did u tried with an hdmi cable in the hdmi port ?
4) did u put a cmos battery in it ?

My digital meter said 000.9mV so that's what I've written, I hope I've done it right :-)

1) CPU gets warm when powered on a few times
2) VGA Nvidia chip is stone cold when turned on a few times
3) I have tried HDMI and VGA with no output
4) Have tried with and without cmos with no difference

Since testing PU502 I have been sometimes getting 1 beep then 7 repeated beeps, somtimes 2 beeps then 7 repeated beeps, sometimes 3 beeps then 7 repeated beeps, and sometimes 4 beeps then 7 repeated beeps.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

I guess the main problem is PU701 or the components around it. there may be a short there. This guess may be wrong though.
Now with the AC adapter disconnected, temporarily remove the CPU from the board and check resistance to ground on pins 25,26 of PU701. and also on PL703.

Is that black on a ground point and red on the pin?

PU701
25 - starts around 6.75 k ohms and goes up to 6.89 k ohms
26 - 10.10 M ohms

PL703 - 12.16 M ohms
Did it again and it's now 5.56 M ohms and slowly decreasing

[caspian]

Re: Alienware M14x R2 with 7 beeps error

your resistance measurements are OK and do not show any short.
PU502 probably needs a reflow to get fixed that you can do it later.
are you skilled in SMD soldering?
It may be required that you replace PU701 later, but not now.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

your resistance measurements are OK and do not show any short.
PU502 probably needs a reflow to get fixed that you can do it later.
are you skilled in SMD soldering?
It may be required that you replace PU701 later, but not now.

I'm good at soldering larger points but my iron tip is too big for SMD work, I may be able to get a smaller one if needed, I use a hand held loupe for close inspection.

[caspian]

Re: Alienware M14x R2 with 7 beeps error

you are gonna require a hot air station to solder an IC such as PU701 and PU502.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

you are gonna require a hot air station to solder an IC such as PU701 and PU502.

I only have a hot air gun with two speeds.