Car stereo repair

[PtrkLnk]

So I am trying to fix the radio in my car. It turns on and looks fine but no sound comes out. I have figured out that it is something with the amplifier in it because if I connect the line out (bypasses amp) to an external amp the sound comes out fine.

I was wondering if anyone knows what parts of this are for the amplifier, and how hard they are to replace.

Here are some pictures of the main board for it:

 

[davenn]

would have been helpful if you had photo'ed the other side of those 2 big chips
seeing the backside isn't any help

one of them will be the stereo power amp the other mite be a stereo preamp make sure we can read the part numbers on the 2 chips

Dave

 

[PtrkLnk]

car stereo

There are metal plates on the back of the chips. I have to take that plate off and take a picture of the back of the chip, right?

 

[PtrkLnk]

First Chip

I de-soldered the smaller chip and it says "HA13164A" As far as I can tell from websites it is a voltage regulator of some sort. Would this have any effect on the amp?

 

[(*steve*)]

NO, the metal plate is the heatsink you've already removed. The metal plates shown in these images are integral parts of the chip.

You need to destroy the chip to remove these (and you don't want to do that).

Those metal bits are the back of the chip. Turn it around and you'll see the writing we need.

 

[(*steve*)]

I de-soldered the smaller chip and it says "HA13164A" As far as I can tell from websites it is a voltage regulator of some sort. Would this have any effect on the amp?

Yep, sounds like a voltage regulator.

I recommend you stop desoldering things or you'll have the amplifier in a state that can't be tested.

Well, actually, you've already gone that far.

Now you need to reattach the chip to the heatsink, then reassemble everything, THEN resolder the chip back in.

You can't just resolder it in because it won't be aligned with the heatsink any more and things just are not going to work.

 

[PtrkLnk]

Second Chip

The second one says "LA4743K" and then under that "3GFD"

The first part seems to tell me that its an amplifier, and I can find a replacement for not too much money. My question is the replacements don't say "3GFD" under it, they say something else. Is that a problem?

here is the replacement I was looking at. http://www.ebay.com/itm/LA4743K-Man...903?pt=LH_DefaultDomain_0&hash=item1e766743af

 

[(*steve*)]

You're putting the cart before the horse.

You're thinking about replacing things without even knowing if they're faulty.