Anyone?
KookieProfessor
Member
Last Activity: 05-23-2020, 03:14 PM
Joined: 05-02-2020
Location: North Kingstown, RI
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
Anyone?
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
Well,
I got the EEPROM from ShopJimmy, and finally installed it tonight .......... and no difference. I'm bummed. Any suggestions?
Seeing as though the backlight worked when I forced it on with a resistor from 5VSB, I'm guessing it's the main processor chip on the mainboard, but that's just a guess.
Not knowing enough about proper diagnostics, would that make sense with all the readings I took of the regulators on the mainboard?
Anyone have a mainboard available,...Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
Awesome! Will order one up and report back once it's installed. ........
Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
nomoresonys, R_L, budm,
So jumping 5VSB through a 1K resistor to the ON/OFF Inverter pin in addition to the PS_ON pin lit the backlight up just fine. I did have the harness from the Power Supply board disconnected from the Mainboard, so I assume that's why the orange Vizio Logo was not on. (Previously just plugging in the set illuminates it orange indicating 5VSB is good.)
At this point, knowing that the backlights work and both the 5VSB and the 12V signals from the Pwr Supply board are there,...Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
Sorry, make that 1:25pmLeave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
nomoresonys,
The picture I uploaded at 11:25am shows those measurements at the power supply board connectors.Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
nomoresonys,
Unhook both cables (CN201 & CN202) from the Pwr Supply board to the mainboard?Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
I threw the main board in the freezer for a few hours, and no change. .......Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
R_J,
Thanks for mentioning that. I did understand it that way, but got turned around when I wrote the question.
So to clarify further,
• the 5.1VSB from the Pwr Supply board is supplied to the Main board, and
• once the PS_ON signal is sent back to the Pwr Supply board from the Main Board (by activating the On/Off switch or the remote),
• this is the input to the Pwr Supply board to wake up and produce the 12V output, which then is also sent...Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
I will try the freezer trick a bit later today, thanks!
In the meantime, I did some more homework, so to speak.
I initially missed it, but U9 measures:
In: 3.3v
Out: 1.8v
Gnd: 0.55
so that looks good, correct?
Also, I've attached a pic of all the readings from the Pwr Supply connectors.
I'm not sure I understand the CN202 connections, which thus far all stay at 0v. I'm thinking that based upon CN201 supplying PS_ON to the...Leave a comment:
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Re: Vizio SV420M Yellow Logo and That's All She Wrote!
Thanks Guys!
Couple of things:
1) This is the exact fault, per the Shopjimmy notes:
"TV won't power on with remote/buttons when plugged-in (VIZIO is lit in orange, but won't turn to white)"
2) I rechecked the On/Off switch (the top button of the row of buttons on the right side of the main logic board as viewed from the back of the TV), and got 2.39V at the top hot pin, and 2.31V at the bottom pin when pressing the button, 0.0V off the button. This was while having...Leave a comment:
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Vizio SV420M Yellow Logo and That's All She Wrote!
Sorry, meant to say Orange Logo, Not Yellow!
I'm trying to diagnose the subject unit and have read all the available posts on this same unit with similar issues. I think it may be the EEPROM on the main logic board, but I'd like to be a bit more sure that I'm barking up the right tree.
I have 5.21 VSB at the power supply board
0V on PS_ON
PS_On wire disconnected at logic board and then when forcing the Pwr Supply on w/5VSB jumped to PS_ON through a 1Kohm resistor, I get 2.96V @ PS_ON, and 12 volts at the 12 V pins, but nothing else on any of the other power...Last edited by KookieProfessor; 05-05-2020, 11:23 PM. -
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Currently an Automotive Instructor. 30+ yrs as a Factory Rep/Field Svc Engineer/Training Instructor/National Technical Mgr, etc. Auto, Diesel & Heavy Equipment Gearhead, Maker, Mr. Fix It! Always looking to share and learn, so The Kookie Professor is here to do both!
Thanks for having me, great to be here.
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