EPV51 LA-G078P MB CPU too hot..

[Nilam]

dear all ..
i have EPV51 LA-G078P MB ...the cpu is getting too hot when powered on but no display the capacitors above on processor are shorted to GND.
kindly help whether i can remove the capacitors or not ..


Thanks.

[caspian]

Re: CPU too hot..

Thanks to @mcplslg123 for the following post:

https://www.badcaps.net/forum/showth...995#post868995

[Nilam]

Re: CPU too hot..

friend ..i read all the posts after visiting the thread but unable to find the solution..
Anyway thanks .

[dspok]

Re: CPU too hot..

friend ..i read all the posts after visiting the thread but unable to find the solution..
Anyway thanks .

what is the resistance value of shorted caps?

[mcplslg123]

Re: CPU too hot..

caps around cpu will show very low resistance and if you measure in diode mode, your multimeter will always beep. But that's not short. Do the basic for no display case.
01. Flash known good bios with clear me
02.Replace ram module.
03.Inspect carefully for any corrosion/damage
04.Measure resistance on all coils(in power off condition.
05.Measure voltage on all coils in power on condition.
06.Check ram slot requirement like SPD.Clock,Data,Dramrst#
07.Check PLTRST,CPURST,HWPG/ALL_SYS_PWRGD

If you dont get any fault in above listed steps, you need to move to LPCFRAME/LPCCLK which are all signals and require DSO.

Hope this helps you.

[Nilam]

Re: CPU too hot..

I checked coils resistance found around 14.6 Ohms.
I checked voltages on coils . I has 0.86 v on one side but nothing on other side ..
The above scenario is on 3 coils near APU. one coil has 0.94 v on one side but OL on other side.
I am really confused.
The 2 capas i mentioned earlier have 0.00 Ohms to GND.( that are on APU).
I removed the RAM but same issue ..replaced ram also.
Thanks in advance.

[Nilam]

Re: CPU too hot..

I forget to mention that i donot have schematic for above MB ..
Kindly share if anyone has the same.
Thanks

[Nilam]

Re: CPU too hot..

Checked following on S i/O .
EC_SMB CK1 =3.06 V
EC_SMB DA +3.0v
SOC_SML 1 clk=3.0v
SOC_SML 1 DATA+3.0v

Note :-Other earlier Super IO information like PBTN_out, SLP_S3# S4 #S5# are all ok.
Pls suggest if i missed something.

[Nilam]

Re: EPV51 LA-G078P MB CPU too hot..

Super I/O information dounloaded from here
https://www.badcaps.net/forum/showthread.php?t=67108

[SMDFlea]

Re: CPU too hot..

I forget to mention that i donot have schematic for above MB ..
Kindly share if anyone has the same.
Thanks

You can make a request for it in this thread in the "Schematic Requests ONLY!" section https://www.badcaps.net/forum/showth...light=LA-G078P

[mcplslg123]

Re: EPV51 LA-G078P MB CPU too hot..

You dint followed all the steps listed at post#5. You can always check ram requirement without a schematic. Use any other schematic with similar ram module. If you dont want to do basic checking, no one here can repair your mb. Remember, the mb is with you and not us.

[Nilam]

Re: EPV51 LA-G078P MB CPU too hot..

You dint followed all the steps listed at post#5. You can always check ram requirement without a schematic. Use any other schematic with similar ram module. If you dont want to do basic checking, no one here can repair your mb. Remember, the mb is with you and not us.

oops, sorry for not mentioning that RAM supply is ok. 1.2 v and 0.60 v are generated properly.

Thanks again.

Kindly explain me ..is it normal to have voltage on one side of coil and nothing on other side of coil ?

[anshad]

Re: EPV51 LA-G078P MB CPU too hot..

oops, sorry for not mentioning that RAM supply is ok. 1.2 v and 0.60 v are generated properly.

Thanks again.

Kindly explain me ..is it normal to have voltage on one side of coil and nothing on other side of coil ?

A coil in the buck converter circuit will have PWM pulses on one side and regulated DC supply on the other side. Depending on the manufacturer and model, different DMMs shows different reading on the PWM side. Some reads average DC value, some reads highest amplitude of the pulse and others may be confused (since the DC is not constant but rapidly switching) and shows OL (overload) status. It really depends on the DMM.

Btw, in my personal experience, AMD APU/SoC s are lot more hotter than their Intel counterpart. In my place, AMD has low market share and i don't see much AMD boards in my table. The first time i received an AMD SoC board (Ryzen) for repair, i really thought the SoC is bad since it was heating way too much than Intel chips which i am more familiar with. Turned out that problem was in another circuit and i managed to repair it.

[mcplslg123]

Re: EPV51 LA-G078P MB CPU too hot..

oops, sorry for not mentioning that RAM supply is ok. 1.2 v and 0.60 v are generated properly.

Thanks again.

Kindly explain me ..is it normal to have voltage on one side of coil and nothing on other side of coil ?

Thats not enough. You need to check SDA/SCL/RESET/SPD and many more. You will have 1.2/0.6V even when reset is missing on ram circuit.

[Nilam]

Re: EPV51 LA-G078P MB CPU too hot..

Thats not enough. You need to check SDA/SCL/RESET/SPD and many more. You will have 1.2/0.6V even when reset is missing on ram circuit.

Sir
I do not have schematic and i am not able to check above mentioned points without it. kindly help if anything is available.
Thanks

[mcplslg123]

Re: EPV51 LA-G078P MB CPU too hot..

Sir
I do not have schematic and i am not able to check above mentioned points without it. kindly help if anything is available.
Thanks

You cant manage any other schematic with ddr4 memory used?? Use NM-B241 for reference for ddr4 ram requirement.

[Nilam]

Re: EPV51 LA-G078P MB CPU too hot..

Thats not enough. You need to check SDA/SCL/RESET/SPD and many more. You will have 1.2/0.6V even when reset is missing on ram circuit.

Dear sir
sorry for the late reply.
here are the report.
SDA +3.3v (pin 254)
scl (+VDD_spd) +0.78v (pin 253)
SPD(VDD) +3.3v
DRAMRST# 0v (null)
or may be should i recheck with another memory (RAM) ?

seems DRAMRST# not generating ...
kindly help ..whether i use different schematic that uses

thanks

[ktmmotocross]

Re: EPV51 LA-G078P MB CPU too hot..

remove heatsink and pour IPA on dies. when it start to heat from one dot. mostly on PCH die, u have burned PCH. have tons of that intel fault.

[mcplslg123]

Re: EPV51 LA-G078P MB CPU too hot..

SDA/SCL both should be 3V. You have emasured 0.78V on SCL. Are you sure?? DRAMRST# will come from cpu. If everything in ram circuit is ok and still dramrst# is missing even after known good bios flash, very likely cpu is faulty. I just repaired one acer with DRAMRST# missing with 5th gen SOC(Replaced the SOC and got it solved).

[mcplslg123]

Re: EPV51 LA-G078P MB CPU too hot..

remove heatsink and pour IPA on dies. when it start to heat from one dot. mostly on PCH die, u have burned PCH. have tons of that intel fault.

This cant be burnt PCH case. Read his readings of various points. He only have DRAMRST# missing. Yeh, These SOC often fails but majority of them are killed by inexperienced repair guys.