Dumpster Dive fix..

[DotComBoy]

Hey guys, i have a neighbor that was trowing away a portable dvd player that is not working, so i decide to try to fix it. 

It is a Philips PD9000, since i didn´t find the service manual for it, is kind of hard to me to figure the components out.

there is a 8-pin SOIC component that is heating up pretty bad, but i cannot find any datasheet on it. can you guys help me out identifying it?

Its written:
SSY1920
O111C13

and a few other components H1A   / 071Q    / SS14  all of them smd transistors.

[aluck]

which one on pictures is the IC under question?

[Skimask]

http://lmgtfy.com/?q=ssy1920

[aluck]

Long story short, that IC is 4.5-18V,2A 350KHz PWM

[DotComBoy]

which one on pictures is the IC under question?

Sorry forgot to mark the image, see new attachment

Long story short, that IC is 4.5-18V,2A 350KHz PWM

I´ll try to find a datasheet, seems to be made by some company called Silergy, but i cannot find anything in their website

http://lmgtfy.com/?q=ssy1920

Thank you very much for showing this incredible tool. if you havent told me, i would never find out.. 

[AndyC_772]

If it's a power supply component that's getting hot, it's often a fault with the thing it's powering rather than the power supply itself.

Once you've figured out which pin does what, and where the power output is from that particular device, try disconnecting it and feeding in the correct voltage from an external supply. Limit the current!

[DotComBoy]

If it's a power supply component that's getting hot, it's often a fault with the thing it's powering rather than the power supply itself.

Once you've figured out which pin does what, and where the power output is from that particular device, try disconnecting it and feeding in the correct voltage from an external supply. Limit the current!

Waiting for my bench supply to arrive...

[Fraser]

Likely as not you will find a failed smd or through hole electrolytic capacitor on the supply rail. I have repaired many such portable DVD players suffering such a failure. Look around the base of all the electrolytics for signs of leakage. Sadly some leak very little yet still fail. Beware any warm capacitors... they are dead for sure ! In a worst case scenario you have a failed spindle or sled motor driver IC. An internal shorted or leaking driver transistor causes the current consumption to overload the regulator in the PSU. Such drivers often get too hot to touch in such cases.

Place the pcb in a freezer for an hour or so. Remove it and let a frost form on the components, Apply power and see which components defrost first.Those are the components dissipating power...capacitors should not heat up in such a piece of equipment. Its an old but sometimes useful test method when you don't have a thermal camera. Freezer spray can also be used to form a frost layer. You could also build a simple capacitor ESR tester but the freezer technique may save time.

Regards

Fraser

[DotComBoy]

Did the freeze test.
the only thing that heat up was the IC SSY1920,  ;/