baird 42 no picture

[LEEDASH]

Re: baird 42 no picture

I assume you mean 11.94 volts and is that on both sides of the fuse?

Yes

[dick_barton]

Re: baird 42 no picture

Cannot find anything under that model number. Can you confirm it's correct?

[LEEDASH]

Re: baird 42 no picture

Cn42bair

[dick_barton]

Re: baird 42 no picture

Do you have the following voltages:-

Con4
Pins 3, 4 = 5V
Pin 5 = Power _On
Pin6 = 5Vstb
Pins 12 & 13 = 12V

Con3 & Con 5 = 24V

[LEEDASH]

Re: baird 42 no picture

Sorry bud,Im a amateur,So these have to be tested again with unit on or standby

[dick_barton]

Re: baird 42 no picture

Test with unit on standby and give the voltages on those pins and then out of standby giving the pin voltages again.

[LEEDASH]

Re: baird 42 no picture

con4 only has 4 pins or am i reading it wrong

[dick_barton]

Re: baird 42 no picture

Can you post a well focused photo of the edge connectors and any printed labels alongside them.

This is MLT668 Rev1.5

[LEEDASH]

Re: baird 42 no picture

[dick_barton]

Re: baird 42 no picture

So alongside each connector pin there's a legend.
Can you measure the voltage on each wire and compare it to what is written alongside
Example
Legend Name = Reading
GND = 0V
+5V = xxxxV
5VSBY = xxxxV
12V = xxxxV
24V = xxxxxV
etc

[LEEDASH]

Re: baird 42 no picture

yes can do,before i start do i set dc to 200 ? as reading higher than 20v on multi,ground the black and read from the red,placed inside connector with connecting block still connected,if you understnad what im talking about,
does the tv set have to be switch on or standby ?

[dick_barton]

Re: baird 42 no picture

You can set your meter to 200V dc if you want to. Place the black meter lead on metal panel and the red lead to connector pins.
Again do the check in standby and then out of standby.

[LEEDASH]

Re: baird 42 no picture

You can set your meter to 200V dc if you want to. Place the black meter lead on metal panel and the red lead to connector pins.
Again do the check in standby and then out of standby.

standby
+12v zero
+12 zero
sdnd no reading

+5 0.68
+5 0.68
stb 0.1
5vsb 5.04

con 4
24v 0.07
24v 0.07
sgnd zero
sgnd zero


switched on.....

con 4

24v both 23.6
sgnd zero


con5

+12v 11.8
+12v 11.8
sgnd all three zero reading

5vsb 04.9
stb 01.9
+5v 04.9
+5v 01.9

[dick_barton]

Re: baird 42 no picture

standby
+12v zero
+12 zero
sdnd no reading

+5 0.68
+5 0.68
stb 0.1
5vsb 5.04

con 4
24v 0.07
24v 0.07
sgnd zero
sgnd zero


switched on.....

con 4

24v both 23.6
sgnd zero


con5

+12v 11.8
+12v 11.8
sgnd all three zero reading

5vsb 04.9
stb 01.9
+5v 04.9
+5v 01.9

Those voltages all appear to be fine except for the last one??

[LEEDASH]

Re: baird 42 no picture

Yes...where the source

[dick_barton]

Re: baird 42 no picture

Yes...where the source

I don't know what you mean?

[LEEDASH]

Re: baird 42 no picture

me neither,so its dropped voltage,how do i know what powers this pin

[dick_barton]

Re: baird 42 no picture

Is there a cable at that location and are you are saying it reads 1.9V and not 5V which is written alongside? Where does the cable go? The power supply provides power to other circuit boards so it's an normally an output not an input.

[LEEDASH]

Re: baird 42 no picture

selected 20v on multi,the 5v are reading 5v the 'stb is 2.01,

[dick_barton]

Re: baird 42 no picture

So it now looks as though you have all the voltages and power to the backlights and Tcon board.

I don't know what else to suggest. It may be an EEPROM problem which are available from:-
http://www.ohmsupplies.co.uk/BAIRD-C...-PREPROGRAMMED

But perhaps better to wait to see what others on the forum suggest.

Can you hear sound when connected say to a DVD player?