I need help on this acer v5-471 48.4TU05.04M laptop, at first laptop came here dead shorted PU4401 so replaced it and laptop turns on now, but the problem no display, already tried replacing ram with good one still same and external still no display,upon check voltages there in 3.3v and 5v and 1.5v on and vcore 1v, but there is no PLTRST# and DRAMRST#. Ive notice also PU4201 ISL95836 chip is very hot, upon checking pins pin 9 VR ON have 3.3v pin19 PGOOD 3.3V and PIN36 PGOODG 3.3V, anyone can help on this please
Acer v5-471 no display
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Re: Acer v5-471 no display
Share schematic
If your ic is ram ic check Suson,mainon signal at ic and ton voltage which is connected to PCH in some motherboard
pltrst# is a signal coming from PCH,it is also indicate that your PCH is active if you get this signal then we can get slp-s5,S4 and S3# from PCH at coils and will generate state voltage.
Check pltrst# signal going at which locations
Or share schematic I guideLast edited by stingerchamp; 12-09-2020, 07:00 AM.Comment
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Re: Acer v5-471 no display
thank you for the response, here is the schematicComment
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Re: Acer v5-471 no display
Ok now we have pltrst# signal after we get
So_power_good which comes after we get slp_s3#
First check these then check imvp_,, power good
Use full signal name and where did you check it
And share where did you check plt_rst# signalComment
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Re: Acer v5-471 no display
i check the pltrst# on wifi slot pin22 there is no voltage there, also check dramrst# on pin30 on ram slot there is no voltage there, noticed PU4201 ic is getting hotComment
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Re: Acer v5-471 no display
At page 36 you have small circuit for plt_rst#
Q3601
Check r3616 getting signal there
At pin 37 of LAN RT you have plt_rst#
Check voltage at r1908 resistor
S0_PWR_GOOD as mentioned in previous post check it first then check imvp_pwgood because both are connected to and gate logic to generate sys_powerok to pch
For dramrst signal you have at page 37 q3703 , check c3703 for short
Check dramrst_cntrl_pch available at gateComment
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Re: Acer v5-471 no display
if you dont have dramrst#, then why focus on pltrst#?? You are far from it. Pltrst# is one of the last signals. Concentrate on your RAM IC and do check Q3703 as suggested. You can even remove Q3703 and power up the mb and see if dramrst# rises.Comment
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Re: Acer v5-471 no display
I found q3703 s=3.3v both drain and gate 1.5v c3703= other side have 3.3v but other side have 0vComment
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Re: Acer v5-471 no display
Q3703 measurements proves its working and dramrst# is present. Are you sure you measured on pin30 of dimm slot and there is no voltage?? It seems very unlikely. Re-measure it if possible.Comment
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Re: Acer v5-471 no display
Check continuity between Q3703 drain pin to pin30 of ram slot. Are you counting the pin correctly??Comment
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Re: Acer v5-471 no display
I double check it from dran of q3703 to pin 30 0f ramslot there is no beepingComment
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Re: Acer v5-471 no display
already tried that, also tried resolder each pin still no DRAMRst# on pin 30Comment
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Re: Acer v5-471 no display
If at drain you are getting 1.5Vol then q3703 is working
and it is connected to pin 30 of reset signal at ram slot
What is voltage exact value at
Pins ,1 ,199,126 ,200,202, 203,204 , 75 ,30
Remember we need 1.5voltage at pin 30 not 3.3vLast edited by stingerchamp; 12-12-2020, 01:35 AM.Comment
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