2004 P6001BD Repair Help

[rhempz01]

U4
8 2.5v
9 .410v
14 31.7mv

 

[Perry Babin]

Lift/remove D18. Again be ready to remove power if the amp draws excessive current.

 

[rhempz01]

So d18 was actually broken it came out in pieces. Two halves. I don't think it was me.

 

[Perry Babin]

Did the amp produce audio after removing the diode?

 

[rhempz01]

Yes I only let it play for a few seconds and shut it off

 

[Perry Babin]

Did it seem to work perfectly?

Do you think you could desolder individual pins on the LM339 ICs? For example, could you desolder and lift pin 2 on U4 and U5?

 

[rhempz01]

yes i have the equipment for that, and i believe i could. The audio didnt sound to bad really i used my 4ohm kicker, that way i could get a good determination of what it would sound like. I need to order some heat sink paste all i have is small tubes from radioshack, silicone based something....im not sure if its even good for amps. So desoder the pins then what comes next....

 

[rhempz01]

i just ordered 2 5oz tubes of the dc340 for 32 dollars shipped, so ill plenty for in the future. am i going to need to order any of those diodes?

 

[Perry Babin]

Reinstall the first diode you removed and desolder pin 2 on those ICs. After they're desoldered, the amp should power up. If it doesn't, post what it does.

If it powers up, bridge each pin to the pad it was soldered to, one IC at a time. Does one IC allow it to function normally where the other causes the amp to remain shut down.

You will have to replace the broken diode. You can order it when you order D11.

 

[rhempz01]

i could use a little help finding the correct diodes. if you dont mind. thanks

 

[Perry Babin]

The part numbers are on the diagram.

MMBD914L and ES2D

 

[rhempz01]

I realize that some components are left out intentionally, some were removed by me. Is c4, and r4 supposed to be empty, that anyone knows of. I'm looking over the scheme Perry posted for me know.

 

[Perry Babin]

In most cases, the manufacturers only omit the parts but don't go back and remove the solder paste application for the part. This leaves the paste on the pads and it draws up as is seen on your board. When parts are removed, the solder isn't left clean and uniform as you see on the pads for those parts.

In photos I have of this board, they're not installed.

 

[rhempz01]

ok thanks perry. I did get the dc340 today and i should get the other parts tommorow, ill then reinstall the diode and lift the legs on the ic's, I will post the results there after.

 

[rhempz01]

i reinstalled the diodes and had at one point the thermal light off, protection still on? with audio. when i replace d18 the audio cuts off, D9 is missing a pad, not sure if it is relevant or not. I lifted both the pins on the ic's, installed the diodes. should i jump the pin 2 to the pad while its powered up, or shut it off jump one, test, ect?? anytime i put d18 back in the audio cuts off

 

[rhempz01]

So if I have u5 pin 2 down the amp thermal lights up and the audio cuts out.

 

[Perry Babin]

That would make it look like U5 was defective if the same didn't happen with U4.

 

[rhempz01]

OK I'll replace that one and post back on this.

 

[rhempz01]

Is the Texas instruments lm339d a good replacement for the ic?
http://www.mouser.com/Search/m_ProductDetail.aspx

 

[Perry Babin]

The link didn't work. You have to check links in a different browser to see if they work.

You need one in an SOIC package.