Dell E176FPb (highvoltage)

[lorins_core]

Hello to all fellas

i have dell E176FPb monitor no power. i open the monitor and checked the primary voltage no power and i used a multi-tester. to check for resistance, i find a fuse has been (open) i remove it and i changes a new one and i try to power on again automatically the fuse (open) T2ah/250v. i think they have problem in hot area and i already experience repair before but is not a same brand. i saw the capacitor blowted 100u/450v (c605) then i check the mosfet p7nk80zfp (Q601) then also i check the one resistor (r615) open.



here is picture




update... pic



i replace it as a same value...
1. T2ah/250v
2. capacitor blowted 100u/450v
3. mosfet p7nk80zfp (Q601)
4. resistor (r615)


result same as no power. but a new part i re test again ok.
and also the the voltage is high?

i check on AC supply Voltage




i check on DC supply Voltage



Here in Philippines Voltage Source 220V-240V AC.

the ac voltage has been 500+ voltage not normal and then in dc voltage 300+.
what part have a problem. may i know?



TIA...

[lorins_core]

Re: Dell E176FPb (highvoltage)

follow up

[stj]

Re: Dell E176FPb (highvoltage)

there are no pictures.
btw, if the main cap is blown you probably have a shorted primary rectifier.

[lorins_core]

Re: Dell E176FPb (highvoltage)

there are no pictures.
btw, if the main cap is blown you probably have a shorted primary rectifier.

sir you mean the Bridge diode?. i already to change nothing happen.
by now the problem is high voltage and no power.


ot: now the fuse not blown.

[lorins_core]

Re: Dell E176FPb (highvoltage)

anythere can help me.....

[lorins_core]

Re: Dell E176FPb (highvoltage)

help.... Any one have schematic diagram of this LED Monitor

[viziks]

Re: Dell E176FPb (highvoltage)

The voltage across mains filter will be about 320Vdc,it's normal.If you have replaced MOSFET and low value resistor labelled 4 please confirm what value you have replaced with.It should be about 0.5 ohms. There maybe other resistors which are open or PWM IC.
Post better pictures.

[lorins_core]

Re: Dell E176FPb (highvoltage)

The voltage across mains filter will be about 320Vdc,it's normal.If you have replaced MOSFET and low value resistor labelled 4 please confirm what value you have replaced with.It should be about 0.5 ohms. There maybe other resistors which are open or PWM IC.
Post better pictures.

heres the new picture



can work if .22ohms replace w/ .39ohms?



but the old resistor is this





Also wheres the PWM IC?

Thank you for Advice Friend

[stj]

Re: Dell E176FPb (highvoltage)

no pics visible

[lorins_core]

Re: Dell E176FPb (highvoltage)

no pics visible

may i know that?

[momaka]

Re: Dell E176FPb (highvoltage)

Attach your pictures to this forum, please. Click on "Post Reply" and if you scroll down on the page, you will see a button "Manage Attachments". Use that.