Alienware M14x R2 with 7 beeps error

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

just measure voltage on each side separately.

I measured them when they where bridged and they had 5.12V across them.

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

I measured them when they where bridged and they had 5.12V across them.

when there was solder on them ( bridged) u got 5 volts ?

if so:

voltage on q26 pin 4 ?
R270 is 102k ?

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

when there was solder on them ( bridged) u got 5 volts ?

if so:

voltage on q26 pin 4 ?
R270 is 102k ?

5.12V when bridged.

Q26 pin 4 is in post 110, will have to test R270 when I have some more free time.

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

r270 should be the one near pq206 mark. check value (without power ofcourse) and also voltage both side of that resistorwhen powered on.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

r270 should be the one near pq206 mark. check value (without power ofcourse) and also voltage both side of that resistorwhen powered on.

39.3 k ohms across R270
37.4 k ohms pin1 to ground
8.43 k ohms pin2 to ground

R270
pin1 - 18.97V
pin2 - 3.373V when not beeping, flashes between 3.373V and around 3.295V when 7 beeps are sounding

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

q285 voltages on pin 3-4-5 ?

edit:
voltage on q27 pin 4 ?

i think pin 4 of both q27 and q26 should be 18 volts...

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

q285 voltages on pin 3-4-5 ?

edit:
voltage on q27 pin 4 ?

i think pin 4 of both q27 and q26 should be 18 volts...

Q285
pin1 - 0.0mV
pin2 - 0.1mV
pin3 - 3.388V when not beeping, flashes between 3.388V and around 3.315V when 7 beeps are sounding
pin4 - 0.0mV
pin5 - 0.1mV
pin6 - 2.574V when not beeping, flashes between 2.574V and around 2.495V when 7 beeps are sounding

Q26
pin1 - 2.585V when not beeping, flashes between 2.585V and around 2.505V when 7 beeps are sounding
pin2 - 2.585V when not beeping, flashes between 2.585V and around 2.505V when 7 beeps are sounding
pin3 - 2.585V when not beeping, flashes between 2.585V and around 2.505V when 7 beeps are sounding
pin4 - 3.386V when not beeping, flashes between 3.386V and around 3.315V when 7 beeps are sounding
pin5 - 5.13V
pin6 - 5.13V
pin7 - 5.13V
pin8 - 5.13V

Q27
pin1 - 3.326V
pin2 - 3.326V
pin3 - 3.326V
pin4 - 17.07V
pin5 - 3.326V
pin6 - 3.326V
pin7 - 3.326V
pin8 - 3.326V

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

as i said pin 4 of q26 is low. ih should be 17-18 volt like on q27.

2 reason: or r270 is bad or q26 is bad.

u can try:

1) replace r270 with 102k resistor

2) remove q26 and see if pin 4 get 17 volt and pin 1-2-3 get 5 volt.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

1) replace r270 with 102k resistor

Will a 100.8k ohm resistor be within tolerance?

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

100,8k is ok for me.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

1) replace r270 with 102k resistor.

With R270 resistor in the circuit, it is 39.3k ohms, when I test the original resistor out of circuit it is 101.6k ohms which is good.

Is this resistor ok? Should I put the replacment 100.2k ohm resistor in or put the original 101.6k ohm resistor back on??

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

try the new one....

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

What do you think of this rework station, it is in my budget and has temperature control and attachments.

http://www.ebay.com.au/itm/332327137330

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

try the new one....

Shows 39.3k ohms in circuit as before, voltage is the same with new resistor. Do I put the original back on?

[caspian]

Re: Alienware M14x R2 with 7 beeps error

What do you think of this rework station, it is in my budget and has temperature control and attachments.

http://www.ebay.com.au/itm/332327137330

I do not know about this brand.
however, this device does not seem stable and powerful.
If you always need a hot air rework station, buy some decent station like these ones:
Gordak-952 or BK-601D
or buy a used station. they should be cheap.

[caspian]

Re: Alienware M14x R2 with 7 beeps error

now remove Q26 and measure voltages again.

[dellxps15]

Re: Alienware M14x R2 with 7 beeps error

What do you think of this rework station, it is in my budget and has temperature control and attachments.

http://www.ebay.com.au/itm/332327137330

this is not good. get an atten 8586 or similar. it has controlled temperature, easy tips on market, all replacement parts and so on. its about 70-80 euros.

put back the old resistor and remove q26 and see if pin 4 get 17 volts after q26 is removed. if yes, replace q26.

[Johndill]

Re: Alienware M14x R2 with 7 beeps error

Good news, I asked a local micro solder repairer guy (that runs his business from home) if I could use his rework station free of charge and he said yes I could :-) I went there today, I replaced R270 properly with it's original resistor and removed Q26 from the board, pad 4 of Q26 now gets 18V as it should and R270 gets around 99k ohms across, now I have to find a replacement for Q26 and hopefully that will fix the +5VS line :-)

[caspian]

Re: Alienware M14x R2 with 7 beeps error

it is a good progress in this board repair.

[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.