Alienware M14x R2 with 7 beeps error

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Where can I buy a new replacement IC marked AO4478 BA341R, I don't have this one on any of my donor boards, they are different markings.

Or is it SI4800BDY-T1-E3

[caspian]

Re: Alienware M14x R2 with 7 beeps error

Q26 is SI4800BDY-T1-E3_SO8. It is cheap and can be found in any local Electronics IC store. If they do not have it, ask them for a compatible replacement that should be an N-channel Mosfet.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Q26 is SI4800BDY-T1-E3_SO8. It is cheap and can be found in any local Electronics IC store. If they do not have it, ask them for a compatible replacement that should be an N-channel Mosfet.

Is this it?
http://au.element14.com/vishay/si480...rfnonsku=false

http://au.mouser.com/Search/m_Produc...tkpGNA9Q%3D%3D

[caspian]

Re: Alienware M14x R2 with 7 beeps error

yes, exactly.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

yes, exactly.

Is this also it even though the markings on it are different?

[caspian]

Re: Alienware M14x R2 with 7 beeps error

if the schematics belongs to the Q33 IC, it is the same as Q26 of your laptop.

[diif]

Re: Alienware M14x R2 with 7 beeps error

Is this also it even though the markings on it are different?

4800B is the important bit on the chip, the rest will be date codes/manufacturing plant/package type etc. so are unlikely to match.
It's the correct chip.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

4800B is the important bit on the chip, the rest will be date codes/manufacturing plant/package type etc. so are unlikely to match.
It's the correct chip.

Mine is 4478 and this one is 4800B, but they are the same SI4800BDY model on the schematics, is that ok?

Mine is the 2x pics on the left and 2x on the right is the donor part

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Great news and bad news, great news is the +5VS line is working, the speaker beeps are loud and clear high tones as it should be and the keyboard LEDs are working properly and the fan runs at a higher speed, bad news is I still have 7 beeps, sometimes 3 beeps then 7 beeps as I was getting before, so one problem is fixed, now have to find the other, I'll test Vcore again.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Pl703 - 1.118v
pl704 - 1.118v
pl705 - 1.118v

pl504 - 0.0v

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Pl703 - 1.118v
pl704 - 1.118v
pl705 - 1.118v

pl504 - 0.0v

CPU Vcore looks good, PL504 has no voltage.

the following voltages are missing on the board:
GPU_CORE, CPU_CORE, GFX_CORE, +1.5VSDGPUP

These are the areas found earlier with no voltage, where to start next?

[caspian]

Re: Alienware M14x R2 with 7 beeps error

measure PL602 and PL604.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

measure pl602 and pl604.

PL602 - 0.0v
PL603 - 0.0v
PL604 - 0.0v

[caspian]

Re: Alienware M14x R2 with 7 beeps error

now move to PU601 and measure voltage on the following pins after turning on.
- pins 31 to 40
- pin 2
- pin 4
- pin 16
- pin 17
- pin 21

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

now move to PU601 and measure voltage on the following pins after turning on.
- pins 31 to 40
- pin 2
- pin 4
- pin 16
- pin 17
- pin 21

It was difficult to get contact as PU601 is next to the DC jack but I think I got it :-)

PU601
pin 2 - 3.179V
pin 4 - 1.061V
pin 16 - 5.12V
pin 17 - 5.12V
pin 21 - 0.0V
pin 31 - 0.0V
pin 32 - 0.0V
pin 33 - 0.0V
pin 34 - 0.0V
pin 35 - 1.666V
pin 36 - 3.327V
pin 37 - 0.0V
pin 38 - 0.0V
pin 39 - 1.787V
pin 40 - 3.327V

[caspian]

Re: Alienware M14x R2 with 7 beeps error

pin 17 seems wrong.
please measure it again to confirm the 5.12v.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

pin 17 seems wrong.
please measure it again to confirm the 5.12v.

Measured again, pin 17 is 5.12V

[caspian]

Re: Alienware M14x R2 with 7 beeps error

Now, make sure whether PR629, PC623, PR650, and PC641 exist on the mainboard.
Then, measure voltage on each side of them.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Now, make sure whether PR629, PC623, PR650, and PC641 exist on the mainboard.
Then, measure voltage on each side of them.

They are not marked on the board so I cannot locate them. Are there alternate points I can measure?

[caspian]

Re: Alienware M14x R2 with 7 beeps error

post a high-quality photo of PU601 and the surrounding components to help you find them.
or find the boardview of this laptop.