Vizio E321VL dead blown fuse

**budm** · 03-23-2017, 04:38 PM

Re: Vizio E321VL dead blown fuse

Originally posted by ivtec

Thanks dick_barton;appreciate your time;

with power supply board out of the tv

pins 1 and 3=10.6 ohms
Pins 1 and 5=10.2 ohms
Pins 3 and 5=0.6 ohms

So per your post 57, you indicated that those readings above were done in DIODE Mode, then the indicator on the meter should show the result in VOLT not OHM.
Look at your meter again and grab a good diode and test with meter setting in diode mode testing and show us what is showing on your meter screen.

Post 57:
Thanks budm; the above measurements were taken with diode function
and STR Chip out of the circuit.
now with Resistance function.

probe negative on pin 1 and positive on pin 3 =340k
Pins 1 and 5=0.700 M
Pins 3 and 5=0.600M

**ivtec** · 03-24-2017, 02:28 PM

Re: Vizio E321VL dead blown fuse

Hi guys; I 've received the shopjimmy repair Kit and i compared the readings of STR W6053N and KF8n60 which # on the old one i thought it was(KF0N60) and all measurements match,meaning both Mosfets were good ,now that leaves me with Fuse 601 opened and the 2 Mosfets KF5250 which the ones that jimmy sent me are not SM but T220 case and the # is KF5N50 which i had to adapt on the bottom of the board i had to lay them flat on the board hope they fit and not touch the metal frame.

Also was told not to plug tv without a 200v bulb in place of the fuse in case something-else is short, so no component will blow again ,but i only can get 120v bulb,can i use 120v 200w? or something else?

KF5N50

**dskall** · 03-24-2017, 04:03 PM

Re: Vizio E321VL dead blown fuse

100w might be better for small tv

**ivtec** · 03-24-2017, 05:03 PM

Re: Vizio E321VL dead blown fuse

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.

here is the pic attach. of the work done on the replacement of the Q606,Q607 KF5N50 on the bottom of the board.

Attached Files

**dick_barton** · 03-24-2017, 05:39 PM

Re: Vizio E321VL dead blown fuse

Thanks for the follow up. May be useful for someone else with an identical problem.

**ivtec** · 03-24-2017, 06:10 PM

Re: Vizio E321VL dead blown fuse

Originally posted by dick_barton

Thanks for the follow up. May be useful for someone else with an identical problem.

I forgot to say 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 Attach.

Also 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.

Attached Files

**budm** · 03-24-2017, 07:09 PM

Re: Vizio E321VL dead blown fuse

So the replacement for the SMD MOSFETS are Plastic Iso tab, I hope they are not going to be overheat due to know heatsinking to the board but then again the copper pads areas are not that great to begin with. You may want to keep an eye on them.

**tvtimmy** · 03-24-2017, 10:08 PM

Re: Vizio E321VL dead blown fuse

I do recall fixing one like this. I used some old heatsinks and some wire to solder under the board. I used some 5 minute epoxy to glue them to the top of the board in some open area.
Good fix, if it holds up!!!!!

**ivtec** · 03-25-2017, 12:29 PM

Re: Vizio E321VL dead blown fuse

Originally posted by tvtimmy

I do recall fixing one like this. I used some old heatsinks and some wire to solder under the board. I used some 5 minute epoxy to glue them to the top of the board in some open area.
Good fix, if it holds up!!!!!

Thanks tvtimmy;for the tip, i wish i have known that before,if they fail again I'll do that for sure still have 2 more of these.

**ivtec** · 03-25-2017, 12:37 PM

Re: Vizio E321VL dead blown fuse

Originally posted by budm

So the replacement for the SMD MOSFETS are Plastic Iso tab, I hope they are not going to be overheat due to know heatsinking to the board but then again the copper pads areas are not that great to begin with. You may want to keep an eye on them.

Thanks budm; you say these T220 mosfet case material are not as strong as those original SM mosfets as material wise?the SM mosfets had no heat sink so i would assume that these T220 casing are bigger and have more silicon!
you say SMD MOSFETS are Plastic Iso tab,can you please elaborate in comparison to this Mosfet T220 casing materials?Thanks.

**petehall347** · 03-25-2017, 12:57 PM

Re: Vizio E321VL dead blown fuse

the copper on the board is the heatsink for the ones you removed .

**ivtec** · 03-25-2017, 03:07 PM

Re: Vizio E321VL dead blown fuse

Originally posted by petehall347

the copper on the board is the heatsink for the ones you removed .

Thanks you petehall347 mean these TO220 mosfets wont last long due to heat? i wonder why Shopjimmy sent me these TO 220 mosfets since Q706 Q707 are SM mosfets and are part of the Kit i received from Jimmy,this is wrong,i already contacted Jimmy about it ,if i don't get the right ones i will never buy anything from him.

**petehall347** · 03-25-2017, 03:09 PM

Re: Vizio E321VL dead blown fuse

they might be better as they are bigger and should lose heat quicker without extra sinking . there is little copper on the board for the smd ones anyway ..
monitor them with ir thermometer and see if they run too hot or not

**ivtec** · 03-25-2017, 05:25 PM

Re: Vizio E321VL dead blown fuse

Originally posted by petehall347

they might be better as they are bigger and should lose heat quicker without extra sinking . there is little copper on the board for the smd ones anyway ..
monitor them with ir thermometer and see if they run too hot or not

Here the KF5N50 mosfet TO220 data sheet,i don't know much about this stuff.

https://cdn.badcaps-static.com/pdfs/...a0e419085c.pdf

**petehall347** · 03-25-2017, 06:22 PM

Re: Vizio E321VL dead blown fuse

just look up max temp and make sure it gets below that .. sorry i have limited internet and dont want to be downloading pdf

**ivtec** · 03-26-2017, 10:44 AM

Re: Vizio E321VL dead blown fuse

Hi guys;today i decided to reopen my Vizio E321VL since the mosfets heating issue kept bugging me,and when something is bugging me i keep thinking on it and never stop till a fix it otherwise i don't sleep well,he.he,he.. i did check the temperature with my Fluke for about 5 minute with tv running to the existing mosfets without the heat sink,and it went up to 60C*,
So story short i had 2 extra KF5N50 TO220 mosfets and a few Heat Sinks in my scrap,
i made 3 holes in the board in each one,and the end result was this see attachment pics.

Attached Files

**tvtimmy** · 03-26-2017, 11:34 AM

Re: Vizio E321VL dead blown fuse

Looks better than mine did, good work!

**ivtec** · 03-26-2017, 12:14 PM

Re: Vizio E321VL dead blown fuse

Originally posted by tvtimmy

Looks better than mine did, good work!

Thanks tvtimmy i do what i can with what i know and with what i'm can afford to pay for parts,though i'm very cheap, it costed me 20dollares plus 5 bucks for shipment for the kit but i only used the 2 TO220 mosfets,
still have a whole lot of components for future repairs.

**dick_barton** · 03-26-2017, 01:06 PM

Re: Vizio E321VL dead blown fuse

Neat job. Should do the trick amicably.

**ivtec** · 03-26-2017, 01:16 PM

Re: Vizio E321VL dead blown fuse

Originally posted by dick_barton

Neat job. Should do the trick amicably.

Thanks dick-barton.

Vizio E321VL dead blown fuse

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