Vizio e600i-b3 Power Supply Repair

[david.aaron.long]

Hi Badcaps community.

I picked up a used Vizio e600i-b3 locally, hoping for a few dud LEDs only, but alas, it seems there is a problem with the power supply. I've attached pictures of the layout of the TV, the front and back of the power supply, and a few close-ups of some of the connectors. I saw this video on YouTube and determined that the PSU was likely at fault as my power supply gave nearly identical voltages to the video. In the video he just replaced the PSU, but I'm wondering if there is an easy way to diagnose if one of the ICs he mentions under the glue are likely at fault.

Here are my voltages:

CN301:

Pin Label Actual
1 27V 0
2 27V 0
3 27V 0
4 27V 0
5 GND 0
6 GND 0
7 GND 0
8 ISNS 0
9 VSNS 0
10 GBD 0

CN201

Pin Label Actual
1 NC 0
2 AC-Det 0.31V
3 PS-ON 3.39V
4 12v-AU 12.36V
5 GND 0
6 GND 0
7 GND 0
8 12V Reg 12.36V
9 12V Reg 12.36V
10 NC 0
11 LED-ON 0
12 LED-BR 0
13 NC 0
14 12V T Con 0
15 T Con_On 0

These voltages do not change when I attempted to power the set on, and interestingly, the PS-ON voltage is at 3.3V immediately after plugging in the set.

I'm not reading any shorted diodes or fets or seeing any bulged caps. Fuse also checked out. I carefully used a plastic spudger to clean all of the glue away from the 3 ICs on the back of the board.

Here are the 3 labels on the parts that were underneath the glue on the back

L6699D is at U307 near the middle of the back of the power board
TEA1733 is at U1 on the left side of the board near the middle vertically
L6564D is at U101 near the middle horizontally and the bottom 3rd vertically

So to my main question:
Is there an easy way to test these components, or would it make the most sense to just go ahead and replace all 3 for about $10 on Mouser? Thanks for any help you can provide.

[dick_barton]

Re: Vizio e600i-b3 Power Supply Repair

Pin Label Actual
3 PS-ON 3.39V
11 LED-ON 0
15 T Con_On 0

Looks like the mainboard is not sending out the control signal to turn on the Leds and Tcon.

[freakaftr8]

Re: Vizio e600i-b3 Power Supply Repair

Try jumping ps-on yo led-on see if leds come up

[Andrew F. Ali]

Re: Vizio e600i-b3 Power Supply Repair

Try jumping ps-on yo led-on see if leds come up

Disconnect the Main Bd. before attempting this jump test.

[dick_barton]

Re: Vizio e600i-b3 Power Supply Repair

It looks as though the led drivers are on the mainboard so with it disconnected I doubt it will bring up the backlights. However it may bring up the 27V powering the backlights.

[freakaftr8]

Re: Vizio e600i-b3 Power Supply Repair

, Yes LED's driven from the main board are automatic local dimming in this design even know it's great has its drawbacks including over current to LEDs.

I finshed fixing one with burned out Leds.

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

Try jumping ps-on yo led-on see if leds come up

If I jump these connections with the mainboard still connected, both the PS_ON and the LED_ON voltages change to 1.9V and the 27V LED pins remain at 0V.

If I disconnect the the mainboard, PS_ON drops to 0V. Which connections to I need to jumper to fire the Power supply on without the mainboard connected?

[freakaftr8]

Re: Vizio e600i-b3 Power Supply Repair

Ps-on to STB pin. You don't have a stand by voltage pin?

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

no pins are labeled "Standby". In the YouTube video I posted in my original thread, the tech mentioned that pins 8 and 9 labeled "12V Reg" were standby. I'm not sure if that's accurate though. I don't want to blow anything up, so I'll wait and see what you think as far as jumping pin 8 to PS_ON. Thanks!

8 12V Reg 12.36V
9 12V Reg 12.36V

[freakaftr8]

Re: Vizio e600i-b3 Power Supply Repair

I don't think I would gamble that. 12v to ps-on is way to high. And without the mainboard connected testing would be pointless anyway with the LED current drivers on the mainboard.

Imho if led-on to ps-on doesn't work, then you have shorted leds.

Also curious about ac-det. I believe that should go high. What happens to ps-on when turned off in standby mode?

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

There is no standby voltage as far as I can tell on the set, and no standby LED comes on when the set is plugged in. None of the voltages change when you press power on the set. I decided to just go ahead and search the strips for LED issues and every single strip fired on fine with my bench power supply. I think at this point I may just go ahead and start looking around for Power/Main boards, unless those ICs would make more sense to change.

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

Comparing the cost of components to the cost of the board, and based on testing the backlight as good, I'm just going to go ahead and order the power board on ebay and go from there. I'll check back in after that arrives

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

Power board arrived today and the set is working flawlessly. Now to decide wether or not to try to fix the old power board. Thanks!

[Andrew F. Ali]

Re: Vizio e600i-b3 Power Supply Repair

In a situation like this where you have the 1Vdc as the 'St-By'. I would suggest using 2 AA Batteries in series and connecting this 3Vdc to the PS-ON, etc to 'self-test' the PSU. Never connect the 12Vdc to the PS-ON as this will destroy the PSU.

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

That’s a great tip. I also have a bench power supply, so I’ll provably use that in the future for this sort of testing.

[budm]

Re: Vizio e600i-b3 Power Supply Repair

When you try to force on the power supply, you must remove the cables going back to the main board first or you will damage the main board, and always use resistor to limit the current in case you make the wrong connection.

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

That makes sense. I'll definitely disconnect the Power supply completely before trying to force it on. I'm able to run my bench psu down to 100mA, is that still too much current?

[budm]

Re: Vizio e600i-b3 Power Supply Repair

The load dictates how much current it wants to draw from the power supply.

[david.aaron.long]

Re: Vizio e600i-b3 Power Supply Repair

Right. Okay, so I have this power supply: https://www.amazon.com/Yescom-Precis.../dp/B00SWK6M0M

If I turn the current knobs all the way down, and slowly raise them until it starts to register on the supply how much is being drawn, is that still not safe? How much of a resistor should I be attaching if that isn't adequate?

[budm]

Re: Vizio e600i-b3 Power Supply Repair

Set your power supply to 5VDC and then using 1K resistor between the output of the power supply and the PS-ON pin, the current draw will be in mA range, 5mA will be max if the resistor is shorted to GND. We just need enough to turn on the switched Transistor on the power supply board.