Dell E7240 not start.Battery charging works ok.When press start button fan start running after 10-20 seconds and I feel heat sink temp rising. No still boot, only black screen. No picture with outside HDMI monitor.
Trying also without RAM, then Dell self diagnostic D+Start button works OK for testing LCD panel and I can see colored test sequence. Extra SPA test with FN+Start button do nothing. This model is not possible to test without CPU.
Wlan LED starts after one or two seconds but Wlan switch do nothing. Battery LED works 100% OK, but HD LED blinks only one time when I stop running by pressing start button. Battery LED works OK.
I measured following test point voltages by Fluke 87 and LA-9431P shematic
https://www.cnet.com/products/dell-l...english/specs/
RTC battery 2,94V
https://www.cnet.com/products/dell-l...english/specs/
AC ON, Run OFF AC Run ON
+VCC_
CORE 0V 1.74V (is this too high voltage for Intel I5 4300u CPU?)
pjp1 ground ground
pjp4 ground ground
pjp5 0V 3.3v
pjp6 3.3v 3.3v
pjp7 3.3v 3.3v
pjp8 0V 3.3V
pjp9 -0.45V 3.3V
pjp10 -0.45V 3.3V
pjp11 0V 1.05V
pjp12 0V 0V (maybe dock line, no dock station
pjp13 0V 0V (maybe dock line, no dock station
pjp14 3.3V 3.3V
pjp15 0V 1.05V
pjp16 0V 3.3V
pjp17 0V 3.3V
pjp18 0V 5.0V
pjp19 0V 3.3V
pjp20 0V 3.3V
pjp21 0V 3.3V
pjp22 0V 3.3V
pjp23 0V 3.3V
pjp24 0V 5.0V
pjp25 0V 3.3V
pjp100 13.5V 13.5V
pjp200 13.5V 13.5V
pjp201 0V 1.35V
pjp202 0.68V 0.68V
pjp203 0V 1.35V
pjp204 0V 1.35V
pjp301 0.152V 1.05V
pjp400 0V 3.3V
pjp401 0V 1.5V
pjp402 3.3V 3.3V
pjp500 13.5V 13.5V
pjp700 19.6V 19.6V
PL101 3.3V 3.3V
PL102 3.3V 3.3V
PL200 0V 1.36V
PL300 0.152V 1.05V
PL701 13.5V 13.5V
Without battery laptop start itself when put AC connector IN.
Without AC-adaptor laptop start itself when connect battery IN.
With both source I have to start by start button.
I don't know how to test CPU and BIOS? I have also scope for signal line testing..
Trying also without RAM, then Dell self diagnostic D+Start button works OK for testing LCD panel and I can see colored test sequence. Extra SPA test with FN+Start button do nothing. This model is not possible to test without CPU.
Wlan LED starts after one or two seconds but Wlan switch do nothing. Battery LED works 100% OK, but HD LED blinks only one time when I stop running by pressing start button. Battery LED works OK.
I measured following test point voltages by Fluke 87 and LA-9431P shematic
https://www.cnet.com/products/dell-l...english/specs/
RTC battery 2,94V
https://www.cnet.com/products/dell-l...english/specs/
AC ON, Run OFF AC Run ON
+VCC_
CORE 0V 1.74V (is this too high voltage for Intel I5 4300u CPU?)
pjp1 ground ground
pjp4 ground ground
pjp5 0V 3.3v
pjp6 3.3v 3.3v
pjp7 3.3v 3.3v
pjp8 0V 3.3V
pjp9 -0.45V 3.3V
pjp10 -0.45V 3.3V
pjp11 0V 1.05V
pjp12 0V 0V (maybe dock line, no dock station
pjp13 0V 0V (maybe dock line, no dock station
pjp14 3.3V 3.3V
pjp15 0V 1.05V
pjp16 0V 3.3V
pjp17 0V 3.3V
pjp18 0V 5.0V
pjp19 0V 3.3V
pjp20 0V 3.3V
pjp21 0V 3.3V
pjp22 0V 3.3V
pjp23 0V 3.3V
pjp24 0V 5.0V
pjp25 0V 3.3V
pjp100 13.5V 13.5V
pjp200 13.5V 13.5V
pjp201 0V 1.35V
pjp202 0.68V 0.68V
pjp203 0V 1.35V
pjp204 0V 1.35V
pjp301 0.152V 1.05V
pjp400 0V 3.3V
pjp401 0V 1.5V
pjp402 3.3V 3.3V
pjp500 13.5V 13.5V
pjp700 19.6V 19.6V
PL101 3.3V 3.3V
PL102 3.3V 3.3V
PL200 0V 1.36V
PL300 0.152V 1.05V
PL701 13.5V 13.5V
Without battery laptop start itself when put AC connector IN.
Without AC-adaptor laptop start itself when connect battery IN.
With both source I have to start by start button.
I don't know how to test CPU and BIOS? I have also scope for signal line testing..
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