Vizio e600i-b3 Power Supply Repair

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

Okay. I'll make sure to do that when testing power boards from now on. I appreciate the help.

[gsharpe]

Re: Vizio e600i-b3 Power Supply Repair

I know this is an old thread, but I have this model that failed recently with the same measurements on CN201 and CN301. After tracing through the power supply, since I had no schematic, I discovered that D106 had a diode mode reading of 1.39V instead of around .59V. This diode, just a 1N4007, had a cathode reading of .27V when the unit was plugged in. If you looked closely, you could see each end of the diode leads had caused slight localized ‘browning’ of the white PCB as if it had gotten hot at some point. After replacing the diode, the set came back to life and works perfectly. The cathode of D106 now reads 14.3V. I hope this helps someone.

[AdvDes]

Re: Vizio e600i-b3 Power Supply Repair

Hi Badcaps community,

This is a question about E600i-B3 main board voltage regulator values (AP20T03GH).

I recently picked up a "curb critter" freebie that does have back lights, displays the Vizio logo, but does not turn on. Power supply voltages were missing, but returned after I reflowed the solder on the two connectors. According to several YouTube videos of this specific model (Grant's Pass, Shopjimmy.com, and others), voltages at the main board and T-con connectors are correct, and a key T-con voltage is also correct.

Here are my power supply voltages after connector reflow:

CN301:

Pin Label Value
1 27V 25.1V
2 27V 25.1V
3 27V 25.1V
4 27V 25.1V
5 GND 0
6 GND 0
7 GND 0
8 ISNS 0
9 VSNS 2.4V
10 GND 0

CN201

Pin Label Value
1 NC 0
2 AC-DET 3.92V
3 PS-ON 3.35V
4 12V-AU 12.75V
5 GND 0
6 GND 0
7 GND 0
8 12V REG 12.75V
9 12V REG 12.75V
10 NC 0
11 LED-ON 3.05V
12 LED-BR 0
13 NC 0
14 12V T CON 12.75V
15 T CON_ON 3.23V


Main board voltage regulator values (all adjustment resistors are 2.9 Ohms):

Label Tab/center pin Input Output

Q4007 0.40V 3.00V 0.26V
Q4008 0.78V 2.95V 0.26V
Q4009 1.00V 2.70V 0.26V
Q4010 1.05V 2.70V 0.26V
Q4011 0.44V 2.80V 0.26V
Q4012 0.67V 2.60V 0.26V
Q4013 0.79V 2.70V 0.26V
Q4014 0.99V 2.70V 0.26V
Q4015 0.95V 2.69V 0.26V
Q4016 0.90V 2.60V 0.26V
Q4017 0.88V 2.71V 0.27V
Q4018 0.98V 2.61V 0.26V
Q4019 0.76V 2.71V 0.27V
Q4020 0.88V 2.60V 0.26V
Q4021 0.57V 2.69V 0.27V
Q4022 0.75V 2.70V 0.26V

Any assistance in isolating the problem would be greatly appreciated. Thanks!
I've done circuit board component repairs from appliances to car info displays, only because I know which end to grab of the iron for my soldering station!

[jeffj7]

Re: Vizio e600i-b3 Power Supply Repair

I know this is an old thread, but I have this model that failed recently with the same measurements on CN201 and CN301. After tracing through the power supply, since I had no schematic, I discovered that D106 had a diode mode reading of 1.39V instead of around .59V. This diode, just a 1N4007, had a cathode reading of .27V when the unit was plugged in. If you looked closely, you could see each end of the diode leads had caused slight localized ‘browning' of the white PCB as if it had gotten hot at some point. After replacing the diode, the set came back to life and works perfectly. The cathode of D106 now reads 14.3V. I hope this helps someone.

Worked for me thanks for the info.