Vizio M65-C1 | Logo appears for 10 seconds then off

[Bob1394]

I have used the search, and am stumped.

My Vizio M65-C1, Vizio logo appears for about 10 seconds then goes off.Power LED blinks 15 times then the TV powers down.

I have read through many threads on the M65-C1 including the following threads. I feel like I must be looking right past the solution to my problem:
https://www.badcaps.net/forum/showthread.php?t=81088
https://www.badcaps.net/forum/showthread.php?t=84241 (not clear on the Eprom actions)


Observations

1) [Interaction] Power turned on via TV button (or remote)
2) [Observe] The white external facing power LED illuminates and screen turns on with the Visio logo.
3) [Observe] Within about 10 seconds the logo goes off, the backlight is off, and CN9101 pin #15 is still at 3.22 volts (I believe this means calling for the backlight to be on).
4) [Observe] About a minute after the logo goes away and the backlight, the white power led flashes 15 times.
5) [Observe] A short while after the power led flashes, the TV powers itself down. Confirmed by checking voltages across key pins and observe the "power off" voltages.


Pin Voltages

CN9101 -____________OFF______ON
PIN 1 - +5V/+3.5V__5.12V_____5.14
PIN 3 - +12V -______19.17V___19.13
PIN 5 - +12V -______19.17V___19.14
PIN 7 - +12V_A _____19.17V___19.16
PIN 9 - GND -________0V______0
PIN 11 - GND ________0V______0
PIN 13 - 3D _________0V______0
PIN 15 - ON/OFF _____0.1V____3.22

CN9102 -
PIN 2 - +5V/+3.5V -__5.12V___5.14
PIN 4 - +12V - ______19.17V__19.16
PIN 6 - +12V - ______19.17V__19.14
PIN 8 - +12V_A -_____19.17V__19.16
PIN 10 - GND -_______0V______0V
PIN 12 - GND - ______0V______0V
PIN 14 - PS_ON -_____0.5V____3.68
PIN 16 - DIM -_______0V______3.27

CN9201 -
PIN 1 - ON/OFF - ____No Wires Leaving Header
PIN 3 - 3D __________No Wires Leaving Header
PIN 5 - GND _________0V______0V
PIN 7 - GND _________0V______0V
PIN 9 - GND -________0V______0V
PIN 11 - +24V - _____0.01V___24.24V
PIN 13 - +24V - _____0.01V___24.24V

CN9203
PIN 2 - DIM - _______No Wires Leaving Header
PIN 4 - +12V - ______No Wires Leaving Header
PIN 6 - GND - _______0V______0V
PIN 8 - GND - _______0V______0V
PIN 10 - +24V -______No Wires Leaving Header
PIN 12 - +24V -______0.01V___24.24V
PIN 14 - +24V - _____0.01V___24.24V


Photos of boards attached.

Thank you for any advice and direction you can provide.

[nomoresonys]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

those powerboard voltages look good to me, how about a picture of the whole back, as to see how everything is connected.

[nomoresonys]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

you don't have the same problem as either of those threads, you don't have any obvious issues with your voltages as they did.

[nomoresonys]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

might be a backlight/backlight circuit issue.

[Storyteller12]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

Most likely BGA chip Do you have a heat gun? If not use hair dryer and heat up large heatsink over each chip for 45 sec to a 1-1/2 min. Real common problem on Vizio “m” series

[Bob1394]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

Photo attached of entire back to show wiring.

I do have a heat gun, am aware of this technique for reflowing solder for ICs. I am going to give this a try, though want to research the techniques for success a bit. :-)

[diif]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

Buy yourself a cheap thermometer, a TM-902C off ebay is under $10.
Lead free solder melts at 218C/424F, use flux.

[Bob1394]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

___

Fixed. Solution:

1) Protected nearby electronics with aluminum tape (had on hand. Kapton likely better to use).

2) Applied reballing liquid flux around edges of the BGA chip (board has two BGAs, did this process on them seperately)

3) Used 1500 watt heat gun at roughly 6" away. Moved in circular motion.

4) Once I reached a temp of 150*C or 302* F, I slowly moved the heat gun closer and bring the temp to 235* C or 455* F. Advice I found online indicated not to apply this amount of heat for more than 4 minutes.

5) Then I let the BGA and card cool down to room temperature.

6) Remove tape and protections. Reassemble (don't forget to clean the heatsinks and add new heat transfer paste). Win.


TV has been working great for the past few weeks since repaired.

Thank you for you input and advice. You have helped saved a TV from the landfill. :-)

[alfatv]

Re: Vizio M65-C1 | Logo appears for 10 seconds then off

. Advice I found online indicated not to apply this amount of heat for more than 4 minutes.

Yes, the internet is full of experts.
There are already proven reflow profiles developed by industry.
https://en.wikipedia.org/wiki/Reflow_soldering
That's reason you need thermometer and the clock is also not hard to find.