dell 17" E173FPf stuck in standby

[quak]

hi everyone, problem i have with this monitor dell 17" E173FPf  is on power up power indicator is on yellow with no screen, after several attempts to power up it will eventually start, main pcb board type is 790271200A00 QLIF-019 490271200100, any help will be appreciated.

[Turnip]

Hi Quak,

Usually P/S secondary caps near that heat sink. Had several FPf's through and only other faults were - Chopper S/C with R39 resistor O/C and secondary double diode S/C one side.

All the best - Chris.

[quak]

hi, thanks for reply have just changed caps c6 and c26 both 22ouF  and powered up ok on 1-3 startup, 4th attempt it failed again so will try your suggestions, note, heating up caps makes no difference also mains cap holds charge for a while when failure to start which suggests startup ic not running , cheers quak

[Turnip]

Hi Quak,

Recent fun with some Vestel 'IPS' Power/Inverters reminded me that resistors to discharge the main cap aren't compulsory - but awful nice.

There's a tendancy when power supplies can't run for some reason (and start-up is taken from the middle of the mains bridge) Main cap stays fully charged to give any Health and Safety chaps a pulse to power their clip-boards for early pension claims.

As a thought - don't have any spare boards kicking about at the moment - have nice piccies though - Chris.

[quak]

hi, fortunately didn't get zapped off this one! power light staying on after for about 10 seconds after switch off was the give away, my trusty Pliers took the full force! i'll change those caps and let you know how i get on, cheers quak

[sparky]

hi
to discharge smoothing cap use 60 watt bulb across
terminals safer than pliers
dave

[sinclairtv]

or 10k resistor

[Turnip]

Hi,

Like Dave I go for a pigmy on short wires - then I know I'm safe - Chris.