Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

[MisterD]

I picked up this one while on vacation here in Florida...I can't upload Actual Pictures until I get home, but here are a couple from ebay and shopjimmy, I removed and inspected and reinstalled the Power Supply board, all capacitors and solder connections look good, Standby orange light remains on while tv is plugged in, voltage rails have only 5vsb no other voltages present, but Only Sometimes (rarely) I can get the set to sound like it wants to power on while pushing on/off switch and then I can hear the relay click then had 3.3v pson, 12v,and 5v but not 24v, also the Vizio stnby light stays orange, never goes white..have the following voltages on Mainboard Voltage Regulators while set is totally off..

U17 In 5.09v Out 3.34v Adj. 2.09v
U22 In 5.14v Out 3.36v Adj. 2.10v
U44 In 0v Out 0v Adj. 0v
U21 In 2.52 Out 1.25 Adj. 0v
U19 In 5.10v Out 2.51v Adj. 1.26v

When I was able to get the relay to click (rarely) then U44 was
In 11.92v Out 9.62v Adj. 8.35V

Mainboard white sticker part# 3637-0492-0150 (4A)
Power Supply Board part# 0500-0507-0600 DPS-230NP A

I'm not at home but using my Father-In-Laws workshop for now, will be taking this tv home this weekend. Any Help is appreciated. Thanks!

[retiredcaps]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I picked up this one while on vacation here in Florida.

Not my idea of a vacation when I'm in Florida.

Any Help is appreciated.

If there were my TV, I would disconnect all the boards and jumper 5V SB to PSON using a 1K resistor. See if the voltages on the power board are all there and stable. This at least helps narrow down the problem a bit.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Good Idea, will have to see if I can get my hands on a 1k resistor, I'm just getting a head start on this one, also have a dead 42" Philips waiting on me at home. Thanks!

[Bills86e]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I've been lurking here in the background, but have read the vizio eeprom fails.
These posts have been about the e321vl & e371vl mainboards.
Symptoms are orange standby is on, no remote operation, sometimes boots fine, but
then failure returns, sometimes the screen will initiateto thewhite vizio logo but freezes there. Mike-miguel Garcia sells the new and programed eeprom on eBay, a vid on utube
http://www.youtube.com/watch?v=E6mB-YYtZWw itv.com
[url]http://www.ebay.com/itm/Vizio-no-power-repair-E370VL-E371VL-Eeprom-eprom-Amber-Ligth-Repair-main-board-/130791265982?pt=US_TV_Boards_Parts_Components&hash=item1e73c456be

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I don't think it's an eeprom failure on this set as it is a few years old and I'm pretty sure the eeprom problem is only on some of the newer models.

[retiredcaps]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Good Idea, will have to see if I can get my hands on a 1k resistor,

If you can't find a resistor, a couple of AA batteries in series or a 3V coin (CR2032) will work too. PSON should generally be > 3V in order to "turn on".

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

They have some new AA batteries here along with wire and soldering gun (I think), does the 3V have to be constant for PSON or is it just momentary to turn on the PS Board?

[tom66]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

It needs to be continuously present to keep the PSU on. Once it disappears, the PSU will quickly shut down.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Will the batteries last awhile before running down?

[tom66]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Well, I imagine after a few years they might go flat... and then the PSU might shut down.
The current drawn through PSON is a few milliamps typically. Not the whole current for the TV!!

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Okay, Thanks! I appreciate the reply.

[retiredcaps]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

They have some new AA batteries here along with wire and soldering gun (I think),

You can use electrical tape instead of soldering the wires. If you do solder the wires, just make sure they don't touch any of the other pins to prevent any shorts. Taping them might be the easier and safer option?

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

used a 3v coin battery by taping leads to it and alligator clip leads from it, negative going to chassis ground and positive to PSON Pin, applied ac power and heard relay click, checked and found these voltages all present on voltage rails, 3.3v from battery, 5VSB, 12V, 24V. left battery for PSON hooked up for 2 hours and monitored voltages all were present and steady..unplugged tv later and removed 3.3v PSON, plugged back in and pushed power switch and this time the relay clicked and all power supply rail voltages still present..In either case I still only have the orange standby light. NOT WHITE! the processor on the mainboard is warm to the touch. no backlights, dark screen, no sound, Nothing!!! All SMD Fuses check good on all circuit boards...checked other larger voltage regulators..

U15 In 5.08V Out 3.35V Adj. 2.10V
U16 In 12v Out 5V grnd. .01V Marked AZ7805T -E1 904D08
U20 VI 3.34V Out 1.81 grnd. .56V Marked backward C # 1084 085106

all other previously checked voltage regulators still have same voltages as reported earlier and holding steady. I'm not sure about these larger regulators, maybe U16 is bad, it has a different configuration of in/out/ground pins. I appreciate any help I can get. Thanks!!

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I left the TV Plugged in and powered on as mentioned above, was away from it for about 30 more minutes, went to check on it and it was on with a blue screen/no signal...So I hooked up a dvd player to AV2 input and played a dvd movie, was able to use the volume,channel up down,menu and input buttons but had no sound most of the time, the sound would come on for a few seconds every so often but never over 5 seconds at a time.I powered it off then right back on and guess what, no picture, no backlights again..also when the TV was working the Orange/white Vizio light was flashing from orange to white intermittently acting like a bad bulb or bad connection. I'm wondering if its mainboard malfunction, I used a hair dryer to heat it up once and then it came back on with pic no sound again but as soon as I shut it off and tried to power back on it was dead again having only the orange vizio stndby light. I would like to repair this at a component level if possible rather than replacing a complete circuit board, does anyone have any suggestions on what to do next? you help is appreciated.
Thanks again!!

U16 In 12v Out 5V grnd. .01V Marked AZ7805T -E1 904D08 ( This had the same voltage when the tv had a picture or no picture.)

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Info here on U16, it appears to be good.

http://pdf1.alldatasheet.com/datashe...Z7805T-E1.html

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

It's a Positive Linear Regulator, Fixed Output Voltages of 5V, 6V, 8V, 9V and 12V

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

It's a Positive Linear Regulator, Fixed Output Voltages of 5V, 6V, 8V, 9V and 12V

Need Help in diagnosing problem. Thanks!

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

So right now you still do not have 24v and the PS_ON is present?
Never mind, I read post 13, it sounds like the main board trouble.

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Please skip.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

No, at this point I only have the 5V STBY and the power switch does nothing, PSON is not present, I can hook a 3 volt battery to PSON and then will get the 12 and 24v that way.