Need Advice, Sanyo 20ez

7m-gtte

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First off, I am restoring a Donkey Kong junior. It had a cracked neck board, which I
replaced and it would power up but no picture or burnt fuse. Then inspecting every inch i noticed the missing ECB transistor. I felt kinda ashamed for missing something so obvious. Replaced the ECB Transistor and now it blows the 4A 125V fuse. (2SD1090)

I followed the flow chart and checked the diodes D601 -D604 and they were all good. But still blows that fuse.

Any help you can provide would be great.

Thanks

Stephen
 
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sanyo

look for components touching each other on the top side.or i believe it could be a bad flyback.
 
Well I did some more research on diode testing and checked D601 -D604 again.

I connected the red lead to the cathode and the black lead to the anode.
There is no long beep and the meter shows a measurement.

Measures
D601 493
D602 497
D603 493
D604 496

Reversing the leads i get the following. No long beep

Measures
D601 497
D602 493
D603 497
D604 493

So from these reading it means these diodes are shorted correct? Since I can measure them with the leads reversed.

Whats the best place to get these?

Thanks for the help.

Stephen
 
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its best to remove them and test them, you can get a false reading.. i was getting a reading the other day of .203 once i removed it was .585 so it was fine. black lead where the white line is on the end.. at least .400.... red on the other...if you reverse them you should get no reading. shorted will be all 0's with long beep.
 
If you are replacing Q901(2SD1090) current limiter, make sure to replace the mica insulator between the transistor and heat sink.
 
If you are replacing Q901(2SD1090) current limiter, make sure to replace the mica insulator between the transistor and heat sink.

Are you talking about the thermal paste? If so i replaced it.

Ok, I took the diodes out and measured them.

D601 518
D602 519
D603 527
D604 522

Those numbers should indicate good diodes correct? Hmm now what?

Oh yeah, the voltage coming out of the transformer is 110.6 volts.

Any suggestions is welcome.

Thanks

Stephen
 
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are you talking about the thermal paste? If so i replaced it.

Ok, i took the diodes out and measured them.

D601 518
d602 519
d603 527
d604 522

those numbers should indicate good diodes correct? Hmm now what?

Oh yeah, the voltage coming out of the transformer is 110.6 volts.

Any suggestions is welcome.

Thanks

stephen

hello, ok black lead to cathode.. Red to anode.. Cathode is side with the line around it. Also reverse the leads.. Should read open.. No beep.. If you get a reverse reading, its bad..or shorted. Long beep..
 
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