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Old 10-15-2019, 10:44 PM   #1
jaw3
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Join Date: Oct 2019
City & State: Lyons, IL
My Country: USA
I'm a: Knowledge Seeker
Posts: 10
Default Vizio M65-C1 - no picture, help!

Hi,

This is my first post here...

Last night my TV broke. I was streaming a show and the TV froze. When I attempted to turn it off/and back on all I get is a black screen. The power led indicator goes on for about 20 seconds, then it blinks 15 times and the TV restarts... it does that again and then it powers down. I don't see anything at all on the screen, no logo or anything at all.

I tried the suggestions from the Vizio website including unplugging, holding the power button for 30 seconds and plugging back in. No differance.
I unplugged overnight and no change.

So, I took it apart and so far I cannot see any obvious damage. I followed some advice from a YouTube video and measured the following voltages from the output pins on the power board:

CN9102
Pin / Listed on Key / Actual when plugged in / Actual Powered on
2 / +5V +3.5 / 0 / 5.12
4 / +12V / 19.08 / 19.08
6 / +12V / 19.08 / 19.08
8 / +12V_A / 19.08 / 19.08
10 / GND / 0 / 0
12 / GND / 0 / 0
14 / PS_ON / 0 / .006
16 / DIM / 0 / .009

CM9101
Pin / Listed on Key / Actual when plugged in / Actual Powered on
1 / +5V +3.5 / .001 / 5.118
3 / +12V / 19.08 / 19.06
5 / +12V / 19.08 / 19.06
7 / +12V_A / 19.08 / 19.08
9 / GND / 0 / .002
11 / GND / 0 / .002
13 / 3D / .001 / 0
15 ON-OFF / .001 / .157

CM9203
Pin / Listed on Key / Actual when plugged in / Actual Powered on
2 / DIM / 0 / 3.32
4 / +12V / 19.08 / 19.08
6 / GND / 0 / .005
8 / GND / 0 / .005
10 / +24V / .001 / 24.65
12 / +24V / .001 / 24.54
14 / +24V / .001 / 24.53

CM9201
Pin / Listed on Key / Actual when plugged in / Actual Powered on
1 / ON-OFF / 0 / .03
3 / 3D / 0 / 0
5 / GND / 0 / 0
7 / GND / 0 / 0
9 / GND / 0 / .002
11 / +24V / .001 / 24.52
13 / +24V / .001 / 24.52

As far as I can tell these voltages look ok. Are they?

The only other thing I noticed is when I tested the long transistors (I think they are called that?) for continuity there was only one that beeped... it is in the picture: FB9202

If there are any suggestions for further troubleshooting I would really like to save this TV... I don't have the money to buy a new one right now... thanks for your help!
Attached Images
File Type: jpg 2019-10-15_11-32-05_516.jpg (315.4 KB, 12 views)
File Type: jpg 2019-10-15_11-32-10_734.jpg (309.0 KB, 11 views)
File Type: jpg 2019-10-15_11-33-35_022.jpg (311.2 KB, 8 views)
File Type: jpg 2019-10-15_11-31-57_712.jpg (381.2 KB, 11 views)
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