visio vx37l resistor indentity help

[sdinelli]

tv model: vx37lhdtv20A
power supply: DPS-247APB
no standby power
found two transistors shorted all ways (model STP12NM50FP )
found one resistor burned up

resistor Is burned right where the ohm is printed and I cant read it.
I need help trying to figure out the value.
It says "F1J' and also what looks like some symbol &"60B"

The resistor goes from the positive side of main filter cap and connects to the drain of one of the blown transistors as well as one leg of a transformer

PLease help If possible

[budm]

Re: visio vx37l resistor indentity help

That is the fusible resistor, probably <1 Ohm range.

[sdinelli]

Re: visio vx37l resistor indentity help

That is the fusible resistor, probably <1 Ohm range.

thank you
would you be able to recommend a replacement?

[jiroy]

Re: visio vx37l resistor indentity help

Can you put a picture and some mark on the location of this F1J ?

[tw2005]

Re: visio vx37l resistor indentity help

Can you put a picture and some mark on the location of this F1J ?

R805 I would say.

I'll have a guess. First symbol is looking like a R so 0.? And the number has a curve so I'm thinking a 2 or 3. I'm going with 3 So 0.3 ohm.

Let me know what the prize is if I'm correct.

[jiroy]

Re: visio vx37l resistor indentity help

R805 I would say.

I'll have a guess. First symbol is looking like a R so 0.? And the number has a curve so I'm thinking a 2 or 3. I'm going with 3 So 0.3 ohm.

Let me know what the prize is if I'm correct.

Yes , It is labeled R3Ω ,so it's 0.3 Ω. You're a winner ..

[tw2005]

Re: visio vx37l resistor indentity help

Yes , It is labeled R3Ω ,so it's 0.3 Ω. You're a winner ..

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

[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

[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

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..

[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

[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?

[dskall]

Re: visio vx37l resistor indentity help

472v seems rather high

[budm]

Re: visio vx37l resistor indentity help

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

[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

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

[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

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

[sdinelli]

Re: visio vx37l resistor indentity help

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

[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
.