visio vx37l resistor indentity help

[budm]

Re: visio vx37l resistor indentity help

"223J: 1000VHoX:" 0.022uf +/- 5% (J), 1000V rating. You need to remove it to check the capacitance.
BTW, you did verify that the diodes on the cold side for the 12V and 24V are OK, right?
DLA001D SMPS IC.
One of these threads should show info about the DLA001D:
https://www.badcaps.net/forum/search...archid=9081622

[sdinelli]

Re: visio vx37l resistor indentity help

I'm not sure how to test c610. its labeled "phs 223J: 1000VHoX:"
I cant find the schematic on the IC its labeled "DLA00LD(or DLA001D) DEI 92UR642"
My recent tests have been with only the one cable that turns on the tv.(cn3)

[budm]

Re: visio vx37l resistor indentity help

C610 is OK?
Look up spec of SMPS IC601 which drives the two MOSFETs fo r that T1 Transformer to see if you do have VCC to run the IC or not.
BTW, you indicate no 12V/24V, is that without having the 24V cable going to the inverter board?

[sdinelli]

Re: visio vx37l resistor indentity help

I had removed the transformer to gain access to the blown transistors. should i remove the transformer and test?

The problem seems to be I'm getting voltage at the drain(406Vdc) but i need 3-5Vdc at the gate that I'm not getting. It gives a quick flash ranging anywhere between .4Vdc and 2vDC.
I traced this reading to the IC pin. (IC601)

[budm]

Re: visio vx37l resistor indentity help

BTW, I need better straight shot pictures of the WHOLE top and bottom side of that power supply board. Also did you remove one of the power transformer T1 as shown in post#1? That transformer is for 12V/24V power supplies.
This looks to be your PS board:
http://www.shopjimmy.com/vizio-0500-...upply-unit.htm

Vizio 0500-0507-0250 (DPS-247APB) Power Supply Unit.

[budm]

Re: visio vx37l resistor indentity help

Skip this reply one due to your recent update on the DCV of the main filter cap.

[sdinelli]

Re: visio vx37l resistor indentity help

OK I don't know why I was getting those reading before but i teste dit again and I'm getting 162Vdc across the filter cap in standby( which is PFC correct?) and then bumbs up to 406Vdc when i push the power button.

something is up with the transistor circuit.
Reference the second picture at the top. top of the board

[sdinelli]

Re: visio vx37l resistor indentity help

ummm soo yeah using the negative leg of main filter cap got me 528Vdc on the cathode of that diode. and 406Vdc on the anode.
I don't get it.
With the device in standby i have 194Vdc on the cathode of the diode
.

[sdinelli]

Re: visio vx37l resistor indentity help

Thank you for the info guys. hot and cold sides confuse me

[budm]

Re: visio vx37l resistor indentity help

a diode will block ac, so when checking voltages on the cathode, you test in dc.

It will block half the cycle of the feeding AC in rectifying circuit.
http://www.visionics.a.se/html/curri...ectifier1.html

[attainteddragon]

Re: visio vx37l resistor indentity help

a diode will block ac, so when checking voltages on the cathode, you test in dc.

[budm]

Re: visio vx37l resistor indentity help

Negative leg of the main filter cap is the GND ref. for the primary side of the circuit.

[sdinelli]

Re: visio vx37l resistor indentity help

yeah I thought it sounded high. lol should I be using the negative side of the main cap?
should I measure ac or dc?

[budm]

Re: visio vx37l resistor indentity help

Sounds like using the wrong GND Ref. for the meter.

[dskall]

Re: visio vx37l resistor indentity help

472v seems rather high

[sdinelli]

Re: visio vx37l resistor indentity help

SO I replaced the 2 transistors and the resistor.
Now I have standby
psON is up at 4.6V and visio turns from amber to white
BUT I'm only getting about 1-2V on my 12V and 24V

I checked and I'm getting 472Vdc on the big diode (ZD902) behind the transformer in the picture.

Any suggestions?

Also, theres a faint buzzing coming from the new transistors I installed. doesnt that mean the voltage is too low or something?

[sdinelli]

Re: visio vx37l resistor indentity help

sorry for being MIA. Busy Weekend.
Now that you say it. I think you all are right.

For the next $million question..........
How far do you think the damage went?
I have R623 reading 4.8ohms
R621A = 24.6ohms
R62B = 15.7ohms
R618 & R620 (resistors between source and gate) are 20kohms
reading 19.93ohm and 20ohms



What else should I check?
what are the chances the surge blew back into IC 601
thanks for the help amigos

[jiroy]

Re: visio vx37l resistor indentity help

I'm not the original poster.Not after one, I just wanted to know if you had one of these boards and confirmed it was that .

You seemed very certain.

Ah well ; No , i don't have the board , but i have the schematic , and frankly , this one came with many restrictions and warnings considering publishing . That's all..

[tw2005]

Re: visio vx37l resistor indentity help

In my stock of used parts , i'm sure i can find a dozen , but still , Lebanon is very far , unless you wanna wait ..
In case you didn't find it , i'm ready , send me your E-mail

I'm not the original poster.Not after one, I just wanted to know if you had one of these boards and confirmed it was that .

You seemed very certain.

[jiroy]

Re: visio vx37l resistor indentity help

Do you have a live one in captivity to refer to? LOL.

In my stock of used parts , i'm sure i can find a dozen , but still , Lebanon is very far , unless you wanna wait ..
In case you didn't find it , i'm ready , send me your E-mail