Magnavox 32ME303V/F7

[alja]

Re: Magnavox 32ME303V/F7

So if I understand right the main board is bad? Is it in some how fixable?

I did test the BL-ON While pushing the power button and no change whatsoever in the voltage.

I also measure the pins that come from the power supply to the main board and found some with 21v others with 0v and others with 3.3v I don't know if it is relevant but I just did.

[budm]

Re: Magnavox 32ME303V/F7

You can first disconnect the BL-ON wire going back to the main board first and then hook up 1K 1/4W resistor between the 3.3V pin and the BL-ON pin to see if you will get the backlights and the pictures on the screen if other functions of the main board are OK.

[alja]

Re: Magnavox 32ME303V/F7

Please forgive my ignorance and thank you for your patience but how could I disconnect the BL-ON as I understand it goes through the flex from the PS to the Main Board, right? That means I would have to cut the flex? if so How could Identify which part of the flex is the BL-ON

[ron350]

Re: Magnavox 32ME303V/F7

You could unsolder one end of the jumper wire marked BL-SW.
I think you would want to unsolder the south end of the jumper closest to the ribbon connector.

[alja]

Re: Magnavox 32ME303V/F7

Thank you ron350, Just to clarify before doing anything stupid. I am going to unsolder the south end of the J169 (BL-SW) and hook up a 1K 1/4W resistor from the unsoldered end to an end of the J170 (3.3V) then energize and power on right?

Does the resistor have a way to solder it like polarity?

[CapLeaker]

Re: Magnavox 32ME303V/F7

Thank you ron350, Just to clarify before doing anything stupid. I am going to unsolder the south end of the J169 (BL-SW) and hook up a 1K 1/4W resistor from the unsoldered end to an end of the J170 (3.3V) then energize and power on right?

Correct.
This way you don't back feed the 3.3V to the main board and maybe destroy it.

Does the resistor have a way to solder it like polarity?

Nope.

[alja]

Re: Magnavox 32ME303V/F7

I apologize for the time in responding.

I did as instructed and got nothing the red led is still on but nothing when try to power on. I used the 1k 1/4w from BL to the 3.3 v

Does this mean that the power supply is bad?

[Gorrillasnot]

Re: Magnavox 32ME303V/F7

Sorry for bumping a dead thread, but there never was a fix revealed in this thread and, just encase anyone searches this model TV I thought I would post the fix.
BTW my TV is a Funai LF320FX4F which is basically the same TV.

Symptoms: When first plugged in the standby light blinks red 4 times then lights solid. pressing the power button on the TV or remote does nothing.
All voltages on the PSU correct except at the locations near CN501. J169 P-ON +21V= 0v and J168 BL-SW = 0v.

The Fix: In my case I replaced the main board and the TV is now back to working. You could probably troubleshoot the issue down to the component level on the main board, but in my case I took the easy road and replaced the board.