DELL LAITITUDE E6230 turn on only 5 seconds

[Yosua]

Hi my friends, I hope someone can spare a minute to help me troubleshoot a dell latitude e6230 (la-7731p rev 1.0) motherboard where the engine starts 5 seconds then turns off again and doesn't show anything on the screen.

thank you very much if anyone can help me with this problem.

[mon2]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

What is the history of this computer?

Original power adapter?

Does it behave the same with battery?

Remove the battery, test with adapter only.

Remove the memory and test again. Does the logic board remain on ?

Not in front of my database of schematics but is it available for this logic board? If available on this forum, link it.

You can also try to reset the cmos battery and parameters. This is usually a coin cell battery that depletes over time and has to be replaced. Often, CR2032 but you can check.

[Yosua]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

What is the history of this computer?

Original power adapter?

Does it behave the same with battery?

Remove the battery, test with adapter only.

Remove the memory and test again. Does the logic board remain on ?

Not in front of my database of schematics but is it available for this logic board? If available on this forum, link it.

You can also try to reset the cmos battery and parameters. This is usually a coin cell battery that depletes over time and has to be replaced. Often, CR2032 but you can check.

Thank you for taking your time to reply to this post, unfortunately this motherboard came with the condition already detached from the casing and there are no other components besides ram and HSF, I have tried it with new ram but the result is still the same. and i can't find the skematik for this board revision

[mon2]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

1) Remove all power. Meter in resistance mode (2k). Check the resistance to ground for each coil. Looking for any very low resistance values which may note a shorted capacitor which is causing the power supply rail to shut down, for safety reasons.

Post any low resistance values. Some rails may be normal, even with the low resistance reading.

2) Found the schematic in my paid service - encrypted of course but see the attached charger portion.

Check and post the voltage readings for what you can read when the power rail is on. Start with the left side of the charger circuit.

When the logic board turns off, do you see voltages at the first mosfet ? How far does the voltage travel ?

Expecting to hear that the DCIN adapter voltage is still present, whether ON or OFF.

[Yosua]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

1) Remove all power. Meter in resistance mode (2k). Check the resistance to ground for each coil. Looking for any very low resistance values which may note a shorted capacitor which is causing the power supply rail to shut down, for safety reasons.

Post any low resistance values. Some rails may be normal, even with the low resistance reading.

2) Found the schematic in my paid service - encrypted of course but see the attached charger portion.

Check and post the voltage readings for what you can read when the power rail is on. Start with the left side of the charger circuit.

When the logic board turns off, do you see voltages at the first mosfet ? How far does the voltage travel ?

Expecting to hear that the DCIN adapter voltage is still present, whether ON or OFF.

this measurement uses 2K . mode

PL801=.445
PL704=.005
PL702=.005
PL701=.005
PL400=.077
PL600=.009
PL200=.178
PL500=.014
PL100=.427
PL102=.187
PL101=.172

This is a measurement when connected to power and the power condition is on

PL801=0.10v both sides
PL704=0v both sides
PL702=1.06v both sides
PL701=1.03v both sides
PL400=(1.06v side facing chipset ) 0.85v side facing wifi card
PL600=0.89v both sides
PL200=1.52v both sides
PL500=1.05v the side facing the capacitor and 0.83 the other side
PL100=19v both sides
PL102=3.78 (unstable) and 5.32v on the side facing pjp 102 PL101= 3.30v both sides

[Yosua]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

Any one can guide me please ?

[mon2]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

Do not see the mosfet voltage readings. Please see and post the attached voltage readings for these points.

[Yosua]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

Do not see the mosfet voltage readings. Please see and post the attached voltage readings for these points.

Thank you for taking a little of your time
PQ800
PIN 8,7,6,5=19V
PIN 4=0V
PIN 1,2,3=19V

PD801 PIN 1=19V

PU800
AC IN=3.43V
AC OK=3.09

[mon2]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

These look like good voltage readings.

See attached.

Measure & post the voltages for the high and low side mosfets for the switching power supply.

Measure first without battery, then with battery.

[Yosua]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

These look like good voltage readings.

See attached.

Measure & post the voltages for the high and low side mosfets for the switching power supply.

Measure first without battery, then with battery.

This is for measurement without battery, because I received this mobo without battery too
PQ804
Pins 1.2.3=0.08v
Pins 4=0.10v
Pin 5.6.7.8=19.61v

PQ805
Pins 1.2.3=0v
Pins 4=0v
Pin 5.6.7.8=0.11v

[mon2]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

Pin 5.6.7.8=19.61v

Do you see this ~19V remain on after the 5 seconds ? Or does this rail also turn OFF after 5 seconds ?

[Yosua]

Re: DELL LAITITUDE E6230 turn on only 5 seconds

Do you see this ~19V remain on after the 5 seconds ? Or does this rail also turn OFF after 5 seconds ?

no bro, this 19v voltage is still there even though the engine is 5 seconds off