Vizio E321VL dead blown fuse help

[silva1955]

Hi guys; i have a Vizio E321VL dead with  blown fuse,can you please advise on what other components should i check before i replace fuse  and turn it on?i checked some of components on the board and there are 4 mosfets 2 of them see pic, i circled  the 2 mosfets kf5n50 that test short in circuit,don't know if these are bad!any help would be appreciated.

[downunder]

The two FETs (circled) will be toast. Check the main regulator STR-W6053 for shorts as well as the bridge rectifier below the fuse for shorts.

If the dead FETs are on the cold side of the power supply, I'd say they've merely failed. Replace them and in place of the fuse, substitute a 100W 240V

lamp. This will protect the components against failure if other problems exist. If the lamp lights up brightly when mains is applied, you still have problems.

Bruce

[silva1955]

The two FETs (circled) will be toast. Check the main regulator STR-W6053 for shorts as well as the bridge rectifier below the fuse for shorts.

If the dead FETs are on the cold side of the power supply, I'd say they've merely failed. Replace them and in place of the fuse, substitute a 100W 240V

lamp. This will protect the components against failure if other problems exist. If the lamp lights up brightly when mains is applied, you still have problems.

Bruce


Thanks Bruce;i'm trying to find  STR-W6053N,regulator  KN0N60,and  Mosf   KF5250, and i can't find them anywhere.

[downunder]

Don't know which country you're in, silva, but UT Source (China) stocks them, cheap as chips, lol. I've been very happy with their service. You don't have to buy in bulk, just ones or twos, but there is about 10 days delivery time. And they use Paypal.                       Bruce

[silva1955]

Don't know which country you're in, silva, but UT Source (China) stocks them, cheap as chips, lol. I've been very happy with their service. You don't have to buy in bulk, just ones or twos, but there is about 10 days delivery time. And they use Paypal.                       Bruce

Thanks Bruce;i'm in USA. 

[silva1955]

Don't know which country you're in, silva, but UT Source (China) stocks them, cheap as chips, lol. I've been very happy with their service. You don't have to buy in bulk, just ones or twos, but there is about 10 days delivery time. And they use Paypal.                       Bruce

Thanks Bruce;i'm in USA. I checked The UT Source,I don't see this Mosf KF5250  the mosfet is like this don't know if this one is ok? and also  Regulator KNON60

https://www.utsource.net/ic-datasheet/20N03HL-1802035.html

This one is STRW6053N is good;  https://www.utsource.net/ic-datasheet/STR_W6053N-1876553.html

KNoN60 About this regulator  not sure if this one is correct:https:        //www.utsource.net/ic-datasheet/FGH60N60SFD-1892195.html

[downunder]

Check out KF5N50DS at UT. Should be the one.

[silva1955]

Check out KF5N50DS at UT. Should be the one.

Thanks that looks like  the surf-mount mosfet KF5250,here a pic of it,   


 Also I  just learned that KNON60 is a Mosfet not a regulator,there are here a few close to the KN0N60 #,are any of these suitable to replace  it?


https://www.utsource.net/search.aspx?page=2&keyWords=mosfet%20KN0N60

[downunder]

Where did this KN0N60 number come from. It is not a typical FET number. Same with KF5250. Your original comment on KF5N50 is a more logical number where '5' represents a 5 amp current capability, and '50' represents a 500 volt limit.

So any N-Channel FET using similar numbers with the same encapsulation should fit the bill.                 Bruce

[silva1955]

Where did this KN0N60 number come from. It is not a typical FET number. Same with KF5250. Your original comment on KF5N50 is a more logical number where '5' represents a 5 amp current capability, and '50' represents a 500 volt limit.

So any N-Channel FET using similar numbers with the same encapsulation should fit the bill.                 Bruce

Thanks Bruce; the # KN0N60 is written on the transistor,what i'm not sure if the 0's are a # or Letter ,


this what comes close to that # this Utsourse.net   


https://www.utsource.net/ic-datasheet/RFG60P06E-327929.html


Or maybe the Mosfet # is KF8N60 instead of the KF0n60!, what do you think?


https://www.utsource.net/search.aspx?keyWords=KF8N60&page=1

[silva1955]

Well;  i ended  up by ordering from shopjimmy the repair kit for my board PLHC-A942B 0500-0412-1300,and i'll post results,hope the Epprom is not bad,thanks.

https://www.shopjimmy.com/vizio-0500...repair-kit.htm

[downunder]

Good choice = you need surface mount FETs.

[silva1955]

Good choice = you need surface mount FETs.

Thanks downunder; the SM Fets are part of the kit,Q706,Q707,but Q602,IC150 i think are also bad and  are in the kit.

https://www.shopjimmy.com/vizio-0500-0412-1300-power-supply-backlight-inverter-component-repair-kit.htm



Description   Quantity   Board Location
Integrated Circuits   3   IC150, U401, 601
Diodes   6   D602, 606, 751, 753, 755, 757
Resistors   11   R183, 608, 618, 701, 704, 707, 711, 752, 756, 759, 762
Capacitors   2   C104, 175
Transistors   5   Q602, 706, 707, 708, 709
Fuses   1   F601

[silva1955]

Hi Guys;;i have good news; my Vizio E321VL is up and running,the following components were used to make the repair;F601,Q602 Mosfet KN8N60,IC150 STR W6053N, Q606,Q607 Mosfes KF5N50.
Note the replacement for the SM mosfet KF5N50 Q606,Q607 were T220 cases instead of the SM so i had to adapt them to the bottom of the board,see link. 

I think the Q602 Mosfet KN8N60, and IC150 STR W6053N,are good but since i had them out and had the New repair kit i went ahead and replaced those and kept the old ones for future repairs.Thanks for all your help on this,appreciate.






https://postimg.org/image/b8p9f5q8t/dbfe5e98/



https://postimg.org/image/b5lfv1o6h/c76997e5/

[downunder]

Glad to hear that you've resolved it, silva. Thanks for the feedback. I just worry a bit that there will be inadequate heat transfer from the fully insulated FETs.

Bruce