sony xplod xmds100p5

[jdeaton01 10+ year member]

ok im repairing a sony xplod 1600 watt amp .xm-ds1600p5 is the model number. when hook the power and the gound up and turn it on it comes on fine with the green light. when i hook the rca cables up the amp goes into protection. doesnt blow any fuses or anything just goes into protection. i have fixed a few problems on the amp so far. i replaced the transitors circled in red one of them was blown so i replaced all of them. i dont know what the ones circled in green should read and dont know what they are to. they are labeled d1 d2 d3 and d4. the ones i replaced are labeled fet 1-12. the ones circled in yellow may be bad but im not sure. when i have my multi-meter on 200 the ones i replaced read around 101.5 and the ones circled in yellow read like 02.5. should all of these read about the same???? do i need to replace the ones in yellow too?? and another thing the little things circled in white look burnt . helpppppp plz

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[Spooney 10+ year member]

Going to need a better quality pic. Sounds like the ones in yellow are shorted and need to be replaced.

 

[akheathen Premium Member]

x2 on gooder pics. anyways, when you replaced all the power fets, you should have replaced all the gate resistors that went to them (circled in white"little burnt things") if you can still read the color code off the good ones, then you can just get all 12 new ones. they are the same. when you say "like 2.5" what does that exactly mean? does one read lower? which legs? yes, they are probably bad. and, the same thing. those big resistors attached to them get replaced with those, too. if it does power up, read the dc voltage from ground, to both sides of each gate resistor, and then read dc voltage across the speaker terminals.