Identify The Chip??? Vizio E480i-B2

[Michale32086]

Got in a Vizio Smart... Dead as a doornail.. Fuse checks out..

Inspection of power board shows this problem..

Any idea what that chip might be?? IC901???

[R_J]

Re: Identify The Chip??? Vizio E480i-B2

Ld7913 , R915 is likely open as well

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

Like this??

https://www.ebay.com/itm/5PCS-LD7913...gAAOSwJwpajh~N

[R_J]

Re: Identify The Chip??? Vizio E480i-B2

Looks like it, LD7913JGM6 there are some sellers selling for less

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

Thanx

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

It's probably a stoopid question, but what other voltage regulator ICs would be compatible??

[R_J]

Re: Identify The Chip??? Vizio E480i-B2

Its not a voltage regulator ic, it is a pwm controller, here is the datasheet

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

Followup on this, as I just got another Vizio in with the exact same problem..

Replaced the IC but still dead as a doornail..

RJ, you mentioned R915... Could you elaborate??

[vinceroger69]

Re: Identify The Chip??? Vizio E480i-B2

does r915 test ok? 4.7 ohm i think maybe its a fusible resistor that feeds that ic?

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

does r915 test ok? 4.7 ohm i think maybe its a fusible resistor that feeds that ic?

I can't seem to locate R915...

[vinceroger69]

Re: Identify The Chip??? Vizio E480i-B2

i can see it in post one i guess that isnt your board i cant see it fitted in post 10 picture of the psu

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

Aww crap... OK my mistake...

You are correct, these are two different boards..

I saw the exact same chip issue and conflated that with them being the exact same board..

My bust...

[vinceroger69]

Re: Identify The Chip??? Vizio E480i-B2

are all the voltages correct as per the data sheet in post 7

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

Dunno how to read the specs ( am just a knuckle dragging ground pounder type tech ) but the voltages off the chip are all over the place.. Negative and positive...

[vinceroger69]

Re: Identify The Chip??? Vizio E480i-B2

Dunno how to read the specs ( am just a knuckle dragging ground pounder type tech ) but the voltages off the chip are all over the place.. Negative and positive...

im still learning too but pin 5 of the recommended ic vcc voltage in looks like it should between 11v and 25v

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

im still learning too but pin 5 of the recommended ic vcc voltage in looks like it should between 11v and 25v

No Just flits around between .1 and -.1

[vinceroger69]

Re: Identify The Chip??? Vizio E480i-B2

lets hope budm/r_j etc see this thread im sure someone with more experience will advise of more tests

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

Thanx for the replies.. A replacement board is only $20... But it would be nice to fix this one..

[budm]

Re: Identify The Chip??? Vizio E480i-B2

1) What did you use for GND ref. for the meter?
2) Which board are you working on, the one on post 1 or post 10?
3) If it is the board is post 10, then check the Source resistor R601 to make sure it still show <1 Ohm.

[Michale32086]

Re: Identify The Chip??? Vizio E480i-B2

1) What did you use for GND ref. for the meter?

See Pic

2) Which board are you working on, the one on post 1 or post 10?

Post #10...

Probably should start a new thread, eh??