32" Dynex DXL3210A Won't Power On

[tom66]

Re: 32" Dynex DXL3210A Won't Power On

Peak Electronic Design model ESR60 does me well but a bit pricey at ~£70.

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

Oh those rubycons were just spares I just swapped since I had a few extra with the same specs.

How would I go about checking the inverters? Wouldnt the TV turn on (blue led) but just with no picture then?

Does the psu make multiple click sounds (like tic,tic,tic,tic,tic..) when you try to turn it on?

Try unplugging the inverter board and try powering the TV on, if it still won't come on then the issue is either on the mainboard, or the psu.

Can we have some pics of the mainboard too?

[selldoor]

Re: 32" Dynex DXL3210A Won't Power On

"So far only checked the fuse, but it doesn't seem open"


There are at least 2 fuses on the inverter. Check them and also check what voltage
you get at each side of each fuse.

Are you getting the correct voltages at the connector on the main board - looks like they are listed one looks like it should should be 24v?

[selldoor]

Re: 32" Dynex DXL3210A Won't Power On

Can we have some pics of the mainboard too?

Isnt that it in post 1? or do you mean the backs of the boards?

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

I was looking at the altas ESR70, whats the difference between the ESR60 and ESR70?

The PSU doesn't make any sounds at all when I click the power button. I tried unplugging the inverter from the PSU, but the TV still has no response when I press the power button (red LED is still on though)

I checked the larger white fuse, and the smaller blue fuse on the inverter board. Both ends of each fuse read 24.6V, however when I measured the resistance on the blue fuse I got 2.5 ohms and the white fuse reads 0.4 ohms. The blue fuse resistance seems high but I don't know if its just the specs of the fuse.

I checked the voltages from the 24V pin output on the PSU and both read 24.3V coming out of the PSU.

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

photos of the back of the main board, The fuse was checked and not opened.

[budm]

Re: 32" Dynex DXL3210A Won't Power On

The PON should be there when the the power switch is activated. We need that first.

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

When plugged in, measuring the PON pin gives me a reading of 3.06V but every now and then the reading would drop and rise back up to 3.06V quickly.

[budm]

Re: 32" Dynex DXL3210A Won't Power On

And the standby 5.1V is at xxxV?

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

They read, 5.30v and 5.27V

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

They read, 5.30v and 5.27V

Can you [carefully] measure the voltage on the large rubycon capacitor in the power supply? It should be about 160v.

Does what happens with the standby supply voltage when you press the power button?

[ben7]

Re: 32" Dynex DXL3210A Won't Power On

I was looking at the altas ESR70, whats the difference between the ESR60 and ESR70?

The PSU doesn't make any sounds at all when I click the power button. I tried unplugging the inverter from the PSU, but the TV still has no response when I press the power button (red LED is still on though)

I checked the larger white fuse, and the smaller blue fuse on the inverter board. Both ends of each fuse read 24.6V, however when I measured the resistance on the blue fuse I got 2.5 ohms and the white fuse reads 0.4 ohms. The blue fuse resistance seems high but I don't know if its just the specs of the fuse.

I checked the voltages from the 24V pin output on the PSU and both read 24.3V coming out of the PSU.

2.5 ohms? seems suspicious. Take the fuse off the board and measure its resistance again. It should be less than an ohm if its good.

[budm]

Re: 32" Dynex DXL3210A Won't Power On

OK, the standby 5.1V power supply is working, and you also get the 24Vdc power supply when power switch is activated (but the red LED is still on) is working, so that means the PS_ON is working, otherwise you will not get the 24Vdc. On the connector, there is a pin "BON" for backlights on, what do you get there?

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

Measuring the largest capacitor, the postive and negative pin read 0V. There is no response with both 5V1 or PON pin voltages when I press the Power button.

I removed the fuse from the inverter board, and measuring it now gives me 4.2 Ohms, may be a bad fuse? Do you know the specs of this fuse? Photo below.

The BON pin read near 0V or more accurately it measures 0.018V on standby.

[budm]

Re: 32" Dynex DXL3210A Won't Power On

"There is no response with both 5V1 or PON pin voltages when I press the Power button."
So you mean the 5.1V is always around 5v which that is how it should be since it is the standby voltage which should be there when you plug the TV into an outlet. The PON (from the Main board) should go from 0v to around 3v or higher when power switch is turn on, this PON will turn on the 24V for the backlights inverter board. Once the TV finished self test, the main board will send the BON to turn on the backlights, and also the panel on to turn on the T-CON board.
So right now you do not have the BON, but do you have the PON and the 24Vdc?

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

Yes, once I plug in the tv, PON and 24V are already present without me pressing the power on yet and BON is not present.

[budm]

Re: 32" Dynex DXL3210A Won't Power On

That means the main board is not working right. You will have to start checking the voltage regulators on the main board.

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

I found 6 voltages regulators on the main board, how would I know if the regulator is defective? Do regulators usually have one ground pin that is suppose to read 0V?

N603
AZ1117D 8.3E1 B89N70
pin1-0v
pin2-3.31v
pin3-5.27v

N602
8JH 1117H
pin1-2.07v
pin2-3.32v
pin3-5.31v

N604
8JH 1117H
pin1-0.58v
pin2-1.84v
pin3-3.32v

N606A
1122 0730B
pin1-0v
pin2-1.20v
pin3-3.31v

N605
AZ1117D 8.3E1 B89N70
pin1-0v
pin2-3.31v
pin3-5.25v


N611 (Largest one)
AZI0845 ADJEI 829J43
pin1-3.84v
pin2-5.11v
pin3-8.37v

[budm]

Re: 32" Dynex DXL3210A Won't Power On

You can tell if the Regulator is a fixed regulator by observe the followings:notes, we will look at the body of the regulator with 3 bottom pins pointing toward you, lets make left pin to be pin1, middle pin will be pin 2, right pin will be pin3.

Fixed regulator, pin1 will be tied to ground, pin2 will be output pin, pin 3 is an input pin.The numbering on the regulator will indicate the output voltage. I.E. AZ117D 3.3 (or 33 on other brand) = 3.3V regulator. Notes: I think you misread the 3 as an 8. The output should be within +/-2%.

Adjustable regulator, there will be one resistor connected between pin1 and pin2, and there is another between pin1 and ground. There is a formula to calculate the output voltage which is set by the two resistors. The main thing on the adjustable regulator is that the voltage between pin1 and pin2 will always and HAS to be 1.25V, if you do not have this, then the regulator is bad. Second thing is that the voltage between pin1 and pin2 (1.25V) + the voltage between pin 1 and ground = output voltage. I.E. Pin1&2 = 1.25 + 1.25 pin1 and ground, then the output will be 2.5V +/- 2%.

N603: This is 3.3V fixed regulator. OK
AZ1117D 8.3E1 B89N70: more likely to be AZ1117D 3.3E1 B89N70
pin1-0v
pin2-3.31v
pin3-5.27v

N602
8JH 1117H: Adjustable: 1.25 + 2.07 = 3.32V, OK.
pin1-2.07v
pin2-3.32v
pin3-5.31v

N604
8JH 1117H: Adjustable 1.25 + 0.58 = 1.83V, OK.
pin1-0.58v
pin2-1.84v
pin3-3.32v

N606A
1122 0730B: Fixed regulator: 1.20V, OK.
pin1-0v
pin2-1.20v
pin3-3.31v

N605
AZ1117D 8.3E1 B89N70: Fixed regulator, 3.3V, OK.
pin1-0v
pin2-3.31v
pin3-5.25v


N611 (Largest one)
AZI0845 ADJEI 829J43: Adjustable, 1.25 +3.84 = 5.09V, OK.
pin1-3.84v
pin2-5.11v
pin3-8.37v

[tieny]

Re: 32" Dynex DXL3210A Won't Power On

If the numbering on the fixed regulator is 1122 0730B, how do you know that the output voltage is 1.20V?

All the regulators on the main board are working perfectly then, I'm still stumped on this.