sanyo no back ligth

[ealequi]

Re: sanyo no back ligth

with the tv powered on, check the voltage on the small white connector that has the 3 black and 1 white wire, it's near the edge of the power supply board, I see it is labeled BL_ON, hook a volt meter with the black probe to chassis ground and use the red probe at the connector making sure it touches the metal part where the wire goes in, set your meter to DC Volts, report the voltage reading back here.

before anything i gave you the wrong model number, the rigth model number is dp42849
Ok. went i use the fluke i set it on automatic and it show this: stb5v-115ac so all the oder. when i use the craftman it show this: STB5V-42.7 GND 39.4 BL_ON 41. BL_DIM 41.6 WISH IS THE RIGTH READING?

[ealequi]

Re: sanyo no back ligth

stb5v 9.4v
gnd 8.7
bl-on 9.2
bl-dim 10.1

[ealequi]

Re: sanyo no back ligth

stv5v 9.4v
gnd 8.7v
bl_on 9.2v
bl_dim 10.1v

[tom66]

Re: sanyo no back ligth

Something is wrong with your meter if 5V measures 9.4V.

[MisterD]

Re: sanyo no back ligth

Make sure you have the black negative wire hooked to the metal chassis of the TV, are the black and red wires plugged into the correct ports on the meter itself? can you post a picture of the meter with the two wires plugged in? and also show where you have the dial set? Thanks

[ealequi]

Re: sanyo no back ligth

[ealequi]

Re: sanyo no back ligth

look that i was putting it in the wrong ground. in the black cables there was no reading

[MisterD]

Re: sanyo no back ligth

Is the connector where you measured labeled CN6? List any voltages you are getting.

NC = ? V
BL-On = ? V
BL-Dim = ? V
5V STB = ? V

of course Gnd is Ground and will not have any voltage.

[ealequi]

Re: sanyo no back ligth

yes

[ealequi]

Re: sanyo no back ligth

Is the connector where you measured labeled CN6? List any voltages you are getting.

NC = ? V
BL-On = ? V
BL-Dim = ? V
5V STB = ? V

of course Gnd is Ground and will not have any voltage.

bl_on 1.3
bl_dim 3.2
5vstb 5.v

[ealequi]

Re: sanyo no back ligth

bl_on = 1.3
bl_dim = 3.2
5vstb = 5.v

[tom66]

Re: sanyo no back ligth

OK, suspect the inverter portion of P/S. As it is being told to turn on and brightness is set correctly.

There is usually a separate fuse on the combo boards.

[ealequi]

Re: sanyo no back ligth

i did not find any burned fuse

[tom66]

Re: sanyo no back ligth

Can you get a picture of the whole of the bottom of the power supply, green side?

[budm]

Re: sanyo no back ligth

"bl_on = 1.3" that does not look right, I expect >2.5V.

[ealequi]

Re: sanyo no back ligth

"bl_on = 1.3" that does not look right, I expect >2.5V.

what that mean?

[budm]

Re: sanyo no back ligth

It means the signal from the main board is too low to turn on the baclights inverter.
I believe someone in this forum has the service manual for this dp42849.
Any luck on posting the pictures of all the boards so we can see how they are connected together?

[ealequi]

Re: sanyo no back ligth

i can't belive you still anwering peoples question. well apreciated. i will post the picture tomorrow morning. I am very gratiful. thank you.

[budm]

Re: sanyo no back ligth

By the way, Can I get the picture of this connector so I can clearly see the label on the pins? Right now the wires are blocking out the labels.

[budm]

Re: sanyo no back ligth

Service manual:


I did not have a chance to look at it yet.