Dell D430-JAU00 LA-3741P fan&display failing

[kamel]

Hello! Need urgent help P.S !
Fixed initially a short on memory bus +1.8V rail by removing on board cells getting hot one by one, till last cell.
Inserted a DDR2 in SODIMM slot1.
Switched lap, all main voltages are ok, but fan and display are failing.

Voltages measured on FAN & Thermal Sensor IC "EMC4000" are attached.
Issues found :
Pin6- FAN_OUT : 0V ?? no spinning.
Pin30- THERMTRIP_SIO : 0V low, I guess, it should be high i.e +3.3V p.s correct.
Pin29- HW_LOCK# : 0V. Is it Hardware lock signal ? Should it be high level i.e +3.3V ? p.s correct.
Any idea on next steps to help solving issues would be much appreciated!
Thank you

Thermal sensor schematic moved to new thread - https://www.badcaps.net/forum/showthread.php?t=123687
.

[piernov]

Re: Dell D430-JAU00 LA-3741P fan&display failing

Please clarify what "fan and display are failing" mean.
Also THERMTRIP_SIO doesn't have # indicating active low signal, so 0V should be correct (meaning thermal protection not triggered).

[Duranitron]

Re: Dell D430-JAU00 LA-3741P fan&display failing

Switched lap, all main voltages are ok, but fan and display are failing?

what do you mean failing. no fan spin and no display? is there any led that lights as indication the laptop is alive. try to insert known working memory maybe the old one got busted..have you flash the bios..

[kamel]

Re: Dell D430-JAU00 LA-3741P fan&display failing

Please clarify what "fan and display are failing" mean.
Also THERMTRIP_SIO doesn't have # indicating active low signal, so 0V should be correct (meaning thermal protection not triggered).

First, Thanks for your quick follow up.
I mean fan is not spinning and there is no display.

P.s also confirm : Found Pin29- HW_LOCK# = 0V. Is it "Hardware lock" signal ? and if so, shouldn't it be high level i.e +3.3V ?

[kamel]

Re: Dell D430-JAU00 LA-3741P fan&display failing

Switched lap, all main voltages are ok, but fan and display are failing?

what do you mean failing. no fan spin and no display? is there any led that lights as indication the laptop is alive. try to insert known working memory maybe the old one got busted..have you flash the bios..

Thanks for your follow up.
As explained, fan is not spinning and no display.
I add, when switched on, led lights for 45" and then off. All main voltages including cpu are correct.

Though, I shunted pin1 of JFAN1 "+FAN1_VOUT" directly to 3.3v run voltage, power led always went off after 45".

[piernov]

Re: Dell D430-JAU00 LA-3741P fan&display failing

I don't see anything that could allow disabling the onboard RAM in the schematics.

[kamel]

Re: Dell D430-JAU00 LA-3741P fan&display failing

I don't see anything that could allow disabling the onboard RAM in the schematics.

Yes, I agree with you, but as far as I understand, the 3 DDR2 (2 on board and 1 SODIMM SLOT1) are supplied in parallel with same voltages and signals, so removing the 2 onboard DDR2 and using only the SODIMM slot 1 DDR2 should be ok. The GMCH will deal with the existing Ram. Please correct.

[piernov]

Re: Dell D430-JAU00 LA-3741P fan&display failing

If BIOS tries to initialize non-existent onboard RAM, POST will fail.

[kamel]

Re: Dell D430-JAU00 LA-3741P fan&display failing

If BIOS tries to initialize non-existent onboard RAM, POST will fail.

I share your point of view.
Is it possible to edit bios dump and modify it consequently, so as to initialize only the Sodimm slot ?

[kamel]

Re: Dell D430-JAU00 LA-3741P fan&display failing

If BIOS tries to initialize non-existent onboard RAM, POST will fail.

Well, I can confirm now that's a problem of initializing removed onboard RAM, because after assembling laptop, I noticed that 2 leds were constantly blinking once switched on (Memory fail).

Thank you.

Laptop was returned to customer. Thread is to be considered closed.