Dell E198FPB with bad caps

[budm]

Since I did not see any thread on this model, I just fixed one today so I decided to post it for FYI.

[jetadm123]

Re: Dell E198FPB with bad caps

I take it that bad caps were the only problem? And what are the PWM controller and inverter transformer switching transistor part numbers?

[budm]

Re: Dell E198FPB with bad caps

Just bad caps, the Inverter IC p/n did not come out in the pictures.

[tom66]

Re: Dell E198FPB with bad caps

Another monitor saved from landfill. Good work.

More failed Elite capacitors... Second only to CapXon in terms of failures.

[ek2oo2]

Re: Dell E198FPB with bad caps

i got the same model and board with No Power, no standby LED.

No irregularities during ocular inspection (no bad caps), upon voltage check I found only voltages around the BIG cap around 250v up to the Drain side of the BIG Mosfet.

Could it be the 1203 8-pin PWM IC that won't start?

I believe it has an internal start-up circuit.

Help would be much appreciated...

Eugene

[budm]

Re: Dell E198FPB with bad caps

Check the bog resistor connected to the Source pin of the power MOSFET, and also check the small start-up cap (22~47uf 50V) close to the power MOSFET, try heating the caps with hair dryer.
Check the secondary rectifier diodes, transistors/MOSFET in the inverter circuits section for shorts. It could be that the power supply is in the shutdown mode due to shorted circuits.

[ek2oo2]

Re: Dell E198FPB with bad caps

budm you are amazing...

The culprit is the shorted (O ohms) 47uf/50v that is located nearest the pwm IC. It prevented the IC from powering up... Replaced with a spare cap with the same value. Dell 19" is up and running...

Thanks Badcap.net.. what a great site.

eugene

[Davi.p]

Re: Dell E198FPB with bad caps

that cap must be lowesr..