Fluid tv model#1602103

[Fluidguy]

Hey I have a fluid 46" lcd tv about 4 years old model number 1602103, tv worked one night went to turn it on and nothing. So when I first plug it in the wall i hear a click and the small indicator light turns on blue bottom corner of tv, (this light is usually red when powers off) now indicator light is always solid blue. So I hear no sound or lights on my tv, screen is black no glowing, I opened up the back of it, couldn't see any blown or leaking caps, I ordered a new power supply board pArt#mlt199tl, didn't fix any thing same thing, so when I do a voltage test I get the right voltage for all the pins except 1 pin- +5vsb, when I test that pin on the power supply board I get 2.4 volts, all the rest of the pins give me the correct volts, so what could be going on here , any one got any ideas, I bought a multimeter in case I need to do testing, I bought the power supply board form shop Jimmy's on ebay , could it be a bad board

[Fluidguy]

Re: Fluid tv model#1602103

Defiantly need some help

[tom66]

Re: Fluid tv model#1602103

Please read this:
https://www.badcaps.net/forum/showthread.php?t=39740

[Fluidguy]

Re: Fluid tv model#1602103

Here's a couple pics of what I'm dealing with, the white wire is only reading 2.4volts, the yellow wire beside below it is 5 volts

[Fluidguy]

Re: Fluid tv model#1602103

Power supply

[Fluidguy]

Re: Fluid tv model#1602103

White and yellow wire run to this board, then they run up to the boards on the side of tv, yes I'm sorry Im not sure on the names of parts

[Fluidguy]

Re: Fluid tv model#1602103

Pic of the entire back of tv

[Fluidguy]

Re: Fluid tv model#1602103

Ah I'll throw up another one.

[Agent24]

Re: Fluid tv model#1602103

Does the 5v Standby voltage come back up to 5v if you unplug the cable?

You can upload up to 10 files per post, by the way

[Fluidguy]

Re: Fluid tv model#1602103

No when I unplug it it has no power

[Agent24]

Re: Fluid tv model#1602103

EDIT: Sorry, I completely misinterpreted your post and the photo! I thought the 5v Standby rail was only at 2.4v

But now I read again and realised the 5v Standby rail is on Yellow wire, this is at 5v, that's OK.

White wire - I am not sure what that should be. 2.4v does seem wrong, though. I suspect it should be either 0v or 5v.

[budm]

Re: Fluid tv model#1602103

The White wire is STBY (PS_ON) signal pin from the main board feeding this power supply to turn on the PFC Voltage booster, 12V, and the 24V.
2.4V is OK, it is high enough. BTW: +5VSB is the standby 5V, other Voltages are swithced.
And please post brighter pictures of both top and bottom side of the power supply board, pictures in post 5 is dark. I am trying to read the model number on the power supply board. It looks like MEGMEET MLT??????
So what you need to do is to report all the Voltage as marked by all 3 connectors when the TV is OFF and when the TV is ON.
For example:
CN1:
+12V: OFF = 0v, ON = 12v
+12V: XXXXXX
GND: No need to report ground pin
GND:
GND:
+5V: XXX

[Agent24]

Re: Fluid tv model#1602103

2.4V is OK, it is high enough.

I was going to ask what the minimum was, as I am used to ATX PSUs getting around 5v on PS_ON pin from motherboard, then I looked up ATX spec sheet and it says they use TTL logic levels for that line, so anything above 2 volts is good. I assume it's the same for these TV PSUs then?

[tom66]

Re: Fluid tv model#1602103

Roughly, yes. There's no standard but typically they drive the base of an NPN transistor which turns on an optocoupler. More than about 1V is usually enough to turn them on.

[budm]

Re: Fluid tv model#1602103

This may help explaining how it works.

[Fluidguy]

Re: Fluid tv model#1602103

Ok power supply model# is megmeet mlt199tl, I've already replaced the power supply. I'm going to check all voltages when tv is on/off and I'll report back,

[Fluidguy]

Re: Fluid tv model#1602103

Connector #1

Black GND
Brown 5v
Brown 5v
White 2.4
Yellow 5v
Brown 5v
Brown5v
Black GND
Black GND
Red 11.8

2nd connector
Black GND
Black GND
Red 24v
Red24v

3rd an 4th connector
Red 24v
Red24v
Red24
Red24
Red24v



It reads the same when off an on, as soon as I plug it in the front light turns on to blue it's supposed to be red on this tv when power is off so it's like the tv is stuck on the on position, if I press the power button when the tv is plugged into the wall nothing happens

[clown]

Re: Fluid tv model#1602103

Have you sort out the problem FLuidguy ? What was wrong exactly there ?