ACER_4739Z_POWER ON AND SWITCHES OFF IN 2SECONDS

[nrit77]

Acer 4739z
PROBLEM:power on and switches off in 2seconds(BLUE LIGHT GLOWS FOR 2SECONDS AND OFF)
DIAGNOSIS:
1.VIN 19v ok
2.+3V_ALW AND +5V_ALW ok
3.PL14 COIL +3VPCU ok
4.PL13 COIL +5VPCU ---------------0V NOT OK IT SHOULD BE 5V
5.FOUND PQ11 MOSFET SHORT.REPLACED SAME MOSFET.SHORT REMOVED BUT SAME PRBOLEM.
6.BUT NOW PL13 COIL VOLTAGE IS +1.8 V
7.CAME TO KNOW PU5 RT8223M IC is problem.
8.changed RT8223M.NOW LAPTOP WORKIN FINE.

[mohamedsaid]

goooood job

[gaurav]

Nice job

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[servis jaya]

I Have some problem..solved with it..Thanks..