Emerson LF501EM5F shuts down right after turning on.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

So you indicated that you have all those Voltages with all the connectors in place then we need clarification on what you mean the TV shuts down, the Power LED goes OFF? I do not know if this TV has power LED or not, or the TV is still actually on but the backlights go off.

[Moreno83]

Re: Emerson LF501EM5F shuts down right after turning on.

Well , BUDM is your man for LCD tv's.

I still think it's a mainboard problem. I think some Vestel and LG tv's had the same problem with just showing LG logo on screen. Corrupt software.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Yes on boards they start with "D" for diode. C for capacitor and R for resistor.

A diode measuring OL/Beep only ( out of circuit ) is bad.

Everything is still on the board, nothing out of circuit.
Also I haven't disconnected any connectors either as I'm doing these measurements.
Should I disconnect the LEDs and the main board from the psu when checking these voltages?

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

OK, so you do have Voltage. Is it steady?
How about the DCV on jumper J182 (P-ON+21V)
J183 (AMP+13V)

J182 I get 22.65vdc
J183 I get 13.09vdc.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

Right no we need find out if those Voltages on those test points are steady first without the boards connected, then check them again with all the board connected to see which Voltage disappears.

[Moreno83]

Re: Emerson LF501EM5F shuts down right after turning on.

Yes on boards they start with "D" for diode. C for capacitor and R for resistor.

A diode measuring OL/Beep only ( out of circuit ) is bad.

You need to put black and red prope on both legs and other way around. You should get a reading on 1 side and OL on the other side. It can take a reading on both sides but 1 side will go to OL eventually.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

TV unplugged. Sometimes they beep, sometimes they don't. Are all of those diodes with the number start with Dxxx?

[Moreno83]

Re: Emerson LF501EM5F shuts down right after turning on.

A diode can give you false readings when they are in circuit. Check the diode with both probes in diode mode on both sides. If it beeps both ways ( also out of circuit ) then its bad. If you get OL + reading then it's ok.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

With my meter on diode mode I get a beep on D607.
But testing it the third time it doesn't beep anymore. Same with others.

You are not testing them with TV is still plugged into the outlet, right?

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

I get 3.277 on j151.

OK, so you do have Voltage. Is it steady?
How about the DCV on jumper J182 (P-ON+21V)
J183 (AMP+13V)

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

With my meter on diode mode I get a beep on D607.
But testing it the third time it doesn't beep anymore. Same with others.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

The board is still mounted to the chassis? Black probe on the chassis?
OK, you do have Voltage, not 0V as you reported earlier.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

I get 3.277 on j151.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

You can do the quick DCV test first.
As for component testing I.E. you can test them on board first and see if it shows bad reading then you can lift one leg off the board and then test it again.
You may want to read this thread also:
https://www.badcaps.net/forum/showth...rson+LF501EM5F

OP did not follow through.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Just the power supply board by itself, what DCV do you get at the STBY 3.3V (the test point is on the jumper J151 (ALL 3.3V) close to the black connector CN501 to see if the 3.3V is steady.
Did you also test all those black diodes? I.E. D650 and the rest that have the same big body

I was told about an hour ago that to test any components on a board that they need to be taken off the board.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Ok thanks Moreno. I'll check out the video. I have shorted the flash chip on wireless routers to get them out of a boot loop so I could then perform serial recovery.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

Just the power supply board by itself, what DCV do you get at the STBY 3.3V (the test point is on the jumper J151 (ALL 3.3V) close to the black connector CN501 to see if the 3.3V is steady.
Did you also test all those black diodes? I.E. D650 and the rest that have the same big body

[Moreno83]

Re: Emerson LF501EM5F shuts down right after turning on.

I provided a link. You need to find the EEPROM on the mainboard and short pin 5 and 6.

There is information on youtube and on this site also.
I doubt that it will work but that's what you can try!

In my opinion the memory/eeprom on the mainboard is bad and need to be replaced. A new mainboard will get this tv going again.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

How do I rest the eeprom?
Holding ok doesn't do anything.

[Moreno83]

Re: Emerson LF501EM5F shuts down right after turning on.

What happens when you press ok for 3 secs? You could try to reset the EEPROM on the mainboard and see if it's resets or not......

This can be also a memory problem on the mainboard , only fix is to replace the mainboard.

https://wiki.samygo.tv/index.php5/Un...y_EEPROM_Reset