LA-9001p black screen

[pratyush]

Working on this mobo....Black screen
Flashed bios, checked voltage on every coil all are OK
checked Ram voltages 1.5v , vtt pin no.201 ok, Vtt_ref at pin 1 Okk, pin199 3.3v Okk pin no. 30 also ok

What will be possible solutions?

[pratyush]

Re: LA-9001p black screen

Plt_rst pin13 also present

[SMDFlea]

Re: LA-9001p black screen

Check U5 RTD2132S . http://*******/viewtopic.php?f=58&t=72780

[mcplslg123]

Re: LA-9001p black screen

Plt_rst pin13 also present

Where u r measuring plt_rst?? On wifi mini connector?? If so its not pin13

[pyry]

Re: LA-9001p black screen

Where u r measuring plt_rst?? On wifi mini connector?? If so its not pin13

Plt_rst means if on pin 13 of the kbc there is 3.3v

[pratyush]

Re: LA-9001p black screen

Where u r measuring plt_rst?? On wifi mini connector?? If so its not pin13

at pin no.13 KB9012 and it is present 3.3v

[pratyush]

Re: LA-9001p black screen

Also checked U15 U53 U54 nd Q91 at page 34, these are all working good.

[pratyush]

Re: LA-9001p black screen

Thanking you....for yr replies.

[pyry]

Re: LA-9001p black screen

Check the JLVDS1 display connector
pin 1 + LEDVDD 19v
pin 7 DISPOFF # 3.3v
pin 8 INVT_PWM 3.3v

[mcplslg123]

Re: LA-9001p black screen

Is the mb with dedicated graphics?? Since you are getting PLt_RSt means almost everything is ok in power sequence. Perhaps cpu reset problem. Might be onboard amd processor is bad.

[pratyush]

Re: LA-9001p black screen

Is the mb with dedicated graphics?? Since you are getting PLt_RSt means almost everything is ok in power sequence. Perhaps cpu reset problem. Might be onboard amd processor is bad.

One more thing I missed to mention when I remove ram ram beep is coming

[pratyush]

Re: LA-9001p black screen

Check the JLVDS1 display connector
pin 1 + LEDVDD 19v
pin 7 DISPOFF # 3.3v
pin 8 INVT_PWM 3.3v

19v is okk
but pin 7 DISPOFF# - 0v
pin 8 INVT_PWM - 0.4V
this reading done without lvds cable inserted.
Nd one more thing i am also not getting +LCDVDD at Q71.

[pratyush]

Re: LA-9001p black screen

Is the mb with dedicated graphics?? Since you are getting PLt_RSt means almost everything is ok in power sequence. Perhaps cpu reset problem. Might be onboard amd processor is bad.

Ya, this mb is with dedicated graphic card.

[pratyush]

Re: LA-9001p black screen

Is the mb with dedicated graphics?? Since you are getting PLt_RSt means almost everything is ok in power sequence. Perhaps cpu reset problem. Might be onboard amd processor is bad.

I always stuck in this situation Onboard processor is bad is there any way to confirm directly I take many hours and at the end come to this stage.

[SMDFlea]

Re: LA-9001p black screen

Keep the LVDS connected .Did you check U5 ,the ******* post has a chart with the working voltage from a good board.

[pratyush]

Re: LA-9001p black screen

Keep the LVDS connected .Did you check U5 ,the ******* post has a chart with the working voltage from a good board.

there will many mismatch of the voltage of o/p RTD3132s as suggested by ******* that means it may be faulty...but i don't have same working IC.

[pyry]

Re: LA-9001p black screen

19v is okk
but pin 7 DISPOFF# - 0v
pin 8 INVT_PWM - 0.4V
this reading done without lvds cable inserted.
Nd one more thing i am also not getting +LCDVDD at Q71.

You have to make the measurements with the lvds cable connected.

[pyry]

Re: LA-9001p black screen

Lcd power circuit
3 volts not 19v I was wrong