LCD TV 26 Stay in Standby mode Red led

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

I think I have done a big mistake.This morning I have bought fuses and a resitor because a resistor was burn on the board.But when I have remplace it the new one burn to and I don't know where the problem is.

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

I find a resistor burned but I cant see ohm on it so I can't change him .If someone have a solution ?
Thank's in advance

[selldoor]

Re: LCD TV 26 Stay in Standby mode Red led

Is that a different resistor to the one you replaced?
I can see 2 numbers on it so it is 10? or ?01.
As with the other chip you need to try and clean it - get some IPA from a pharmacie
and do it gently with a q-stick.Do not use your other "cleaner"
I suspect you have been unlucky and the slip has damaged the U102F
What is the part number on that - maybe its datashet will give us the resistance for the resistor

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

The résistor I have change burn when I turn off the psu but the r39 seem to be burn too but I can't see what is write on it I will try to clean it with your product. I done some research but I can't find the datasheet or a picture of the psu so if someone have one of the two?

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

Maybe it is 100 ohm an other cap near this one is a 100ohm.

[selldoor]

Re: LCD TV 26 Stay in Standby mode Red led

Part number on U102F?

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

The R39r.I havent found IPA but I'm afraid that the resistor is burn so a product on it don't help to see something on it.

[selldoor]

Re: LCD TV 26 Stay in Standby mode Red led

The R39r.I havent found IPA but I'm afraid that the resistor is burn so a product on it don't help to see something on it.

No! The IC see pic

[budm]

Re: LCD TV 26 Stay in Standby mode Red led

Can we get bright and clear pictures of the top and bottom side of this power supply/inverter board?

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

I'm not sur but I read: C07575PS
101168
On the U102F.
Some picture in Attachment.

[selldoor]

Re: LCD TV 26 Stay in Standby mode Red led

"Close but no cigar"

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

First thank's for the doc, It seem to be the GND and they are no information on it.I heat and I will check what voltage i have before this resistor.Any other suggestion?

[selldoor]

Re: LCD TV 26 Stay in Standby mode Red led

I am looking for a circuit using the IC may give us a clue to resistor values.

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

Well I found this : on the picture the right resistor is write "104" and in my PSU the resistor at the right of the burn resistor is write 104 too. So according to this pic my burn resistor is "103" apparently 1000ohm?

[selldoor]

Re: LCD TV 26 Stay in Standby mode Red led

Looks possible - I would rather budm had a look - the IC could still be bad but
I dont know how to test it.

Budm also want a good clear pic of the TOP of the board

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

Ok
A new pic:

[Agent24]

Re: LCD TV 26 Stay in Standby mode Red led

Well I found this : on the picture the right resistor is write "104" and in my PSU the resistor at the right of the burn resistor is write 104 too. So according to this pic my burn resistor is "103" apparently 1000ohm?

No, 103 would be 10,000 Ohm. Assume that circuit uses the same resistor values as yours anyway.

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

Can I test the board with a 10 000ohm resistor?

[Agent24]

Re: LCD TV 26 Stay in Standby mode Red led

Sorry, I meant to write "Assuming"

We don't know if it uses a 10K Ohm resistor there on yours, but it does seem similar by the picture...

That pin 3 is current sense pin from MOSFET and R39F is part of filter network as shown in datasheet, so probably the values will be the same as the other board, why would they use different ones for the same IC?

Anyway... it looks like R38F is bad too.

Also, R36F and R37F that feed the VCC pin look bad, so I would not be surprised if that controller IC is shorted at the least, the MOSFET maybe too, and could even be a problem with MOSFET snubber circuit too. You should check all these before you replace the resistors and power it on again.

[flosers]

Re: LCD TV 26 Stay in Standby mode Red led

I have 4 on the 2 resistor (R37-R36) with the multimeter on 200k, that's a good sign I have the same value? If it's not maybe I can replace all this part? It's a current-mode but I don't know what that is.The R38F is good I have 0.