HP 15 / R62 BOARD POWER ON NO DISPLAY / 5V IC HEAT

[skbasir]

HP 15

BOARD PART --- R62 BOARD

PROBLEM-----

POWER ON ...NO DISPLAY .200AMP LOAD ONLY

STEPS BEFORE DIAGNOSIS FIRST LOOK

FIRST LOOK IN DC JACK FOR POWER LED.... BUT POWER LED NOT GLOWING AFTER CONECTING ADP ,,,, BUT SYSTEM JUST POWER ON WHEN PRESS POWER SWITCH ....AND TAKEING .180 amp IN DC SUPPLY... WHICH IS WRONG ..... BEFORE POWER SWITCH ON BOARD LOAD SHOULD BE .03amp FOR NORMAL OPRATTION..... AND WHEN BOARD ON MARK FAN NOT WORKING ..... THIS IS FIRST SUSPECT FOR 5V AREA ISSUE..........


DIAGNOSIS STEP FOR CHECK ISSUE


CHECKED AT FIRST BOARD WHERE 5V IC GETTING HEAT EXCESS

THEN CHECKED FOR THAT 5V COIL FOUND 2.2V INSTED OF 5V

SUSPECTED 5V IC SHROT OR ANY 5V RELATED COMPONET SHORT

THEN CHECKED FOR IMEDANCE OF 5V COIL IS NORMAL... MEAN SOME ISSUE IN VREG VOLT OF 5V IC

THEN I GO FOR CHECK VCC5V IN PU10 PIN11 FOR 5V ,,, BUT HERE GETING ONLY 0 V

HERE SHOULD BE 5V FOR NORMAL OPERATING

THEN I CHECK THIS PIN IMPEDANCE AND FOUND LOW AND SHORTED WITH GND

THIS PIN IS ONLY CONECTED WITH ONE CAPACITOR PC228 AND CHECKED ... FOUND THIS CAP IS SHORT

THEN REMOVE THIS CAP SHORT CLEAR AND PIN 11 IS NOW 5V AVAILABLE AND 5V REGULATOR IC ALSO NO HEATED

BUT STILL ONLY 2.2V AVIL IN 5V COIL WHEN PRESS POWER SWITCH

THEN I SEARCH FOR THIS CAPCAITOR VALUE 1U/6.3V IN BOARD FOR REPLACE IT

THEN I SEARCH IN SCHEMATIC FOR "1U/6.3V"

MANY PLACE I FOUND IT AND ATLAST C509 CAPCITOR FOUND FOR SAME VALUE

THIS IS C509 CAP PLACE IS BEHIND THE PCH AND ALSO MARK IN PICTURE

THEN REMOVE THIS C509 AND PUT IT ON PLACE OF PC228

NOW POWER ON THE BOARD AND 5V ALSO FOUND IN 5V COIL AND FAN ALSO WORK AND BOARD ALSO WORKING FINE NOW

RESOLUTION

JUST REMOVE THE PC228

REMOVE THE C509 AND PUT IT IN PLACE OF PC228

JOB DONE SUCCESSFULLY


THIS IS THE DEFAULT ISSUE IN PARTICULAR R62 MODEL JUST PC228 SHORT FOUND MANY TIMES
MANY TIME FOUND 5V IC HEATING 2.2V INSTEAD OF 5V

AND ALSO THIS ISSUE IS ARRIVE IN PARTICULAR THAT TYPE OF BOAR WHICH BOARD HAVE SEPARATE IC FOR 3.3V / 5V

[javed]

very very nice post thanks for give info,

[ganeshcell]

thanks for this great info

[PINTUSINGH]

thanks for thish info. i also face it problem . thanks bro.

[chandra]

nice sir

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[skbasir]

THANKS TO ALL

[Juandi]

Good job sir

[ Post made via Android ]

[samanthban]

Nice sharing

[Himal]

Nice Sir

[raajkumar]

All information is valuable. You done a great job. thanks