Dead laptop hp dv6 : How to do fault finding by measuring voltages

[v1406]

Dear All,
Hello !

I am looking for a solution to a dead HP DV6-1235ee laptop with the following motherboard:Foxconn
ML1-H94V-0E253117
168UT30001-094D
Quanta UT3 schematics
PU1:: ISL6262
PU2:: RT8206B
PU3:: 8119LN
PU4:: P2805
PU5:: ISL6251

some of the voltages I measured:
DC jack = 19.93V
+VA = 19.90V
+VAD = 19.71V
+VIN = 19.71 V
+5VPCU = 5.25V
+3VPCU = 3.45V
+5VALW = 5.25V
+12VALW = 8.70V ?? is it fine or is overloaded somewhere?

Voltages At EC (KB3926)

9, 22, 33, 67, 96, 111, 125 (3VPCU) = 3.4V
037 3920_RST# = 3.3V
127 LID_EC# = 3.25V
086 ACIN (ACIN_1) = 3.1V

019 NBSWON#1 =3.4 / 0V (before /after power button)
090 DNBSWON#1 3.4 / falls to 0.2V gradually rises to 0.5V and settles there

95 RSMRST# 0V / 2.8 V only for half a second when you press the power button and then falls back to 0V
16 SUSC# 30 mV / 275mV again falls to 30 mV
06 SUSB# 30 mV / 550 mV again falls to 30 mV

BIOS ( U22 sheet no 34)
Pin no. name voltage
1 BIOS CS# 0.18 V isnt it too low?
2 BIOS RD# 1.64 V
3 SPI 3P 3.4 V
4 VSS 0 V
5 BIOS WR# 0.25 V
6 SPI CLK 1.5 V
7 SPI 7P 3.4 V
8 VDD 3.4 V


I would request you to kindly let me know what is going wrong which is preventing the rsmrst voltage from getting high. it tries to go high but falls down immediately to zero.

I don’t know what to do now. Kindly show me the path to tread.

Thanks in advance

 

[lion12327]

i think that this problem caused by some capacitors so check it out

 

[v1406]

i think that this problem caused by some capacitors so check it out

thanks for being the first to answer.

I am looking forward to a few more detailed answers........ explaining what is going wrong so that others too learn from it.

thanks

 

[Trion]

You can get some ideas at: mayohardware.blogspot.com . The author explains a lot of laptop hardware repairs there in detail.