32" Dynex DXL3210A Won't Power On

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Nope, there's still no response.

What are the markings on these 3 chips? Just peel off the paper label that is on one of them.

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

Heres each IC chip going from left to right. I couldn't make out the middle one with paper peeled off.

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Heres each IC chip going from left to right. I couldn't make out the middle one with paper peeled off.

The first one is a headphone amp.
The second one, I cant read the text on it either.
And the third one, I cant find any info on it.

Try getting a bright flashlight and putting up to the chip, and move around and see if you can make them out.

[tom66]

Re: 32" Dynex DXL3210A Won't Power On

Second one is probably serial FLASH due to its size.

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Second one is probably serial FLASH due to its size.

Thats what I am thinking, its hard to figure out the marking codes for them.

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

Eh no luck, i can't seem to make any of it out, my eyes are going =/

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Eh no luck, i can't seem to make any of it out, my eyes are going =/

Did you try a magnifying glass? ;D

[selldoor]

Re: 32" Dynex DXL3210A Won't Power On

You could try Tom66's chalk trick
https://www.badcaps.net/forum/showpo...1&postcount=43

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

You could try Tom66's chalk trick
https://www.badcaps.net/forum/showpo...1&postcount=43

OMG so smart!!!

Whoever invented that should get a cookie!

That sure is a fine little tip! Ofc I have no problem reading the text on chips, but sometimes the text is extremely light.

[selldoor]

Re: 32" Dynex DXL3210A Won't Power On

Is the last one not a 4803a

http://www.digikey.com/scripts/DkSea...O4803A&cur=USD

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Is the last one not a 4803a

http://www.digikey.com/scripts/DkSea...O4803A&cur=USD

It sure is! The symbol is the symbol for Alpha & Omega too.

Tieny, whats the voltage on pin 5 of the AO4803A?

[tom66]

Re: 32" Dynex DXL3210A Won't Power On

Not my trick... Thank Daniel Grillo, the author of that post.

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

If only I had some chalk. On pin 5 I get 0v

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

If only I had some chalk. On pin 5 I get 0v

What voltage do you get on pins 2 and 4?

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

Both pins I get 11.34V

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Both pins I get 11.34V

So that chip must be ok, and its powering something.

We should figure out what that other chip says on it.
Try taking a few more pics to see if you can make out what is written on it, and try it with flash a few times too.

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

I didn't have chalk so I used baby powder instead, I can kinda of make out the numbers now more than before.

[selldoor]

Re: 32" Dynex DXL3210A Won't Power On

That middle chip - is it the one that had the label on- what did the label say.
Also it may just be glue obscuring the lettering even if you havent any chalk
try cleaning it with alcohol.

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

That middle chip - is it the one that had the label on- what did the label say.
Also it may just be glue obscuring the lettering even if you havent any chalk
try cleaning it with alcohol.

I just figured it out, its a MAX120 ADC chip.

EDIT: Turns out its NOT a MAX120, I don't know what it is.

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Tieny, you said you found 6 voltage regulators on the board back in post 38.

I see two more chips that I think could be voltage regulators.

They are both near inductors and capacitors, so I'm guessing they are buck-regulators.

What are their chip numbers?