Sony KDL-32L504 No Power ....Dead

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

+ an - are usually marked on the bridge rectifier or on the board but as budm says it doeant really matter. I thought they would be easier for you to get at than the Big Cap joints though if the BR looks good then that would have been next step.

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

so is there something else i can/should measure?

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

You still need to measure the voltage on the + & - pins. the two outside pins on the device
Meter on 600VDC Care - High Voltage.

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

i measured the outside voltages


Device1-Bridge rectifier
Pin1(red leadon volt meter) to Pin 4(black lead on volt meter) = 170V DC

[budm]

Re: Sony KDL-32L504 No Power ....Dead

That is good voltage.

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

Ok - Now with it all switched on and connected meter on VDC 20 or autorange can you check the voltages at the connector CN6201 and post them. Then with meter on 200VDC check the voltage on the other 24 connector. Put black lead on ground screw and check each pin with the red lead.

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

I plugged in the power cord. I tried pushing the on button to the TV but this did nothing. But i made the measurements on connector CN6201.

I placed the meter on DC volts and placed the black lead on one of the metal screws and the red lead on each of the pins.

Pin1: No connection.......ie no wire in it.
Pin2:0.002V
Pin3:0.002V
Pin4:0.002V
Pin5:0.000V
Pin6:0.000V
Pin7:0.000V
Pin8:0.000V
Pin9:0.000V
Pin10:0.004V
Pin11:0.005V
Pin12:0.013V
Pin13:0.013V
Pin14:0.000V


Now there was a request to measure the voltages on the 24pin connector but i could not find a 24pin connector.

Note: Not sure if this is important or provides a clue.....but as i said earlier pressing the "ON" button does not seem to have an affect.

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

Sorry - should have said 24volt connector - its the other one you took a pic of.
Dont know about the measurements you have given as point sosmething a volt isnt any good can you check the meter with a 1.5v battery and see if it comes up as 0.00015 or 0.0002 or 0.0001 - if so can you change the scaling so it comes up as 1.48 1.50 or 1.52 then re test the first connector again.

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

i took a AA battery (supposed to be 1.5V) and measured it...........the reading on the volt-meter was 1.5V. So the meter is fine.

The meter is a fluke 79III.

I also measured the voltages on the other connector......similar readings as on the other connector........either 0V or around 0.012V.......not very much at all.

You think the "On/Off" switch could be bad?

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

Always worth checking/cleaning there have been a number of cases where that has been the problem.

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

Just to check you did have the connector plugged in to the socket when you did the test?

Next thing will be to test the voltage across the BIG cap - you will need to get to the back of the board - and have it plugged in and switched on - so carefully does it HIGH voltage - meter on VDC600

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

good question but yes, i am 100% positive i had it plugged in as i recall hearing the "click" sound that it makes..........and then i made the measurements.

i wont get to the measurment of the cap until later today.........its thanksgiving day here.........

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

Ok - Happy thanksgiving day.

Regarding Was it plugged in ( yes it did need to be plugged in and switched on) but I meant the white connector from the main board plugged into the white socket on the power supply.

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

yes, all the connectors were plugged back in because it was hard for me to stick the probe down in the socket to get a reading.........but i jammed it in there until i did.........so yes all the connectors were plugged in.

one more quick note: I can plug power to the TV..........but as far as "turning it on".........i dont know if i have it on or not. I press the "power on button" but nothing happens. So i really dont know if the TV is in the correct state or not.............what i did do is press the power button and made the measurements......then pressed the power button again and made the measurements again.........they did not change.

i will try and measure the cap voltage today.

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

Have you got a remote control you can use and as you suggested check out the on/off switch.

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

my neighbor did not give me the remote.....i will ask him for it.....if he has it.

i did finally measure the voltage across the cap. Very interesting.

i have me multimeter connected to the cap. I plug power to the tv and as i have said before i hear the "click".......i then look at the meter and it reads 385Volts DC. The voltage then starts to decrease..........

does this mean anything?

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

any suggestions on how to check out the on/off switch to see if it is working?

[selldoor]

Re: Sony KDL-32L504 No Power ....Dead

....i then look at the meter and it reads 385Volts DC. The voltage then starts to decrease..........

does this mean anything?

You are not writing a suspense novel - what does it decrease to- if its
380 that is ok if its 0 or less than the mains voltage then its a problem.


On off you may be able to test- NO POWER to the set -on the switch board can you find the contacts for the on/off switch - set meter on 200 ohms probe on each contact and press the switch meter should go 0.0 to infinity.

Another test which checks a couple of things is to set it all up then on connector CN6201 and meter on volts DC20 check with black lead on a nearby ground screw and the red lead on the pin labelled P ON while you press the power button and see if the voltage changes. Then do the same on the STBY 3.3 pin. Make sure the lead from the switch panel is plugged in to the board.

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

sorry, i was not being suspencful........the voltage seem to just decrease to 168V DC......so sorry about that......

i will check the voltages you suggested and let you konw the result.......

[Welchs101]

Re: Sony KDL-32L504 No Power ....Dead

ok, i measurd the pins you spoke of.

P-On pin: For a split second after plugging in the power cord the voltage spiked up to 2.75V DC. Then went to zero volts in less than a second.
I pressed the On/Off button several times and the voltage stayed at 0Volts...no change what so ever by pressing the on/off button.

STBY 3.3 pin: For a split second after plugging in the power cord the voltage spiked up to 3.3V DC. Then went to 0.013volts in less than a second. I pressed the on/off button several times and the voltage on this pin stayed at 0.013V......no change.