sanyo DP32648 tv will not turn on

[CR Designs]

Re: sanyo DP32648 tv will not turn on

Follow up, saw the picture of the inverter connector, the STB PIN IS THE INVERTER ON/OFF pin. But right now I believe you have the problem in the main board which is not sending the PS_ON signal to turn on the power supply. You will have to do in depth main board troubleshooting.
please read my basic LCD TV troubleshooting guide.

Budm where should we start on this?

[selldoor]

Re: sanyo DP32648 tv will not turn on

You need to read this:
https://www.badcaps.net/forum/showthread.php?p=261329
It doesnt have much reference to VRs with more than 3 pins but the testing is the same.

1 Locate the VR by reading the numbers on the parts and googling them.
2 Download a datasheet which will give you the pin detail
eg.

Test each pin relative to the ground screw and post the results.
Say if you think it is ok or not, by comparing with the data sheet

[CR Designs]

Re: sanyo DP32648 tv will not turn on

You need to read this:
https://www.badcaps.net/forum/showthread.php?p=261329
It doesnt have much reference to VRs with more than 3 pins but the testing is the same.

1 Locate the VR by reading the numbers on the parts and googling them.
2 Download a datasheet which will give you the pin detail
eg.

Test each pin relative to the ground screw and post the results.
Say if you think it is ok or not, by comparing with the data sheet

Need help selldoor in reading data for these 3 regulators see picture and data sheet

[CR Designs]

Re: sanyo DP32648 tv will not turn on

You need to read this:
https://www.badcaps.net/forum/showthread.php?p=261329
It doesnt have much reference to VRs with more than 3 pins but the testing is the same.

1 Locate the VR by reading the numbers on the parts and googling them.
2 Download a datasheet which will give you the pin detail
eg.

Test each pin relative to the ground screw and post the results.
Say if you think it is ok or not, by comparing with the data sheet

here's that large regulator see picture and data sheet Need help on this one to.

[CR Designs]

Re: sanyo DP32648 tv will not turn on

I poked around the main board around the upper left corner of board where plugs are only could fine 5 volts

[cashkennedy]

Re: sanyo DP32648 tv will not turn on

That first data sheet makes it sound like its expecting a dc input of 5v most likely on pin 1, and then based on the output voltage adjustment (pin 4) it will fluctuate the output voltage (pin 3 / the tab)? But it also sounds like the choice of resistors on pins 3,4,5 will effect the output?

So id sugest while it is running tell us what pins 1, 3(the tab) and 4 measure in dc volts. x 3 if there are 3 of these same regulators.

[CR Designs]

Re: sanyo DP32648 tv will not turn on

That first data sheet makes it sound like its expecting a dc input of 5v most likely on pin 1, and then based on the output voltage adjustment (pin 4) it will fluctuate the output voltage (pin 3 / the tab)? But it also sounds like the choice of resistors on pins 3,4,5 will effect the output?

So id sugest while it is running tell us what pins 1, 3(the tab) and 4 measure in dc volts. x 3 if there are 3 of these same regulators.

Here's the readings
1 .................2 ................3
1. 0.33........ 1. 0.32 ....... 1. 0.33
3. 0.13 ........ 3. 0.00........ 3. 0.22
4. 0.04......... 4. 0.00 ....... 4. 0.04

[cashkennedy]

Re: sanyo DP32648 tv will not turn on

Assuming you read the pins right with 1 as the furthest to the left and 3 as the middle pin / tab, then none of those are receiving the right voltage, or outputing a voltage that would be usefull from what i know...

If you upload a picture of the back of the board, we can try to trace where the 12v wires go / where the traces run after entering the board. You do at leaast get 12v while its plugged in at the power socket on the main board (you already tested the 12v at the power supplys socket, and im saying to test for 12v where the same wire connects to the main board. ) mostly just to confirm that the tv is still in the state where all the voltages are turning on and should be reaching the mainboard.

[CR Designs]

Re: sanyo DP32648 tv will not turn on

Assuming you read the pins right with 1 as the furthest to the left and 3 as the middle pin / tab, then none of those are receiving the right voltage, or outputing a voltage that would be usefull from what i know...

If you upload a picture of the back of the board, we can try to trace where the 12v wires go / where the traces run after entering the board. You do at leaast get 12v while its plugged in at the power socket on the main board (you already tested the 12v at the power supplys socket, and im saying to test for 12v where the same wire connects to the main board. ) mostly just to confirm that the tv is still in the state where all the voltages are turning on and should be reaching the mainboard.

That's how I read them, We lost 5v on pSB It's now pulsing between 1.8v and 2.9v Same on main board

[cashkennedy]

Re: sanyo DP32648 tv will not turn on

Could be that the power supply is intermittent when a load is placed on it. That can be tested by hooking up small 12v car lights to the 12v rail, jumping the power supply on, then measuring the voltage. If you want to go that route, someone who does that more often can chime in with their recomendations to test it under load. Your multimeter could also need new batteries.

[CR Designs]

Re: sanyo DP32648 tv will not turn on

Could be that the power supply is intermittent when a load is placed on it. That can be tested by hooking up small 12v car lights to the 12v rail, jumping the power supply on, then measuring the voltage. If you want to go that route, someone who does that more often can chime in with their recomendations to test it under load. Your multimeter could also need new batteries.

batteries o.k tested with a different multimeter got the same voltage readings and still pulsing.I unpluged the plug form the PSB to main board got the 5 volts back.Plug main board back end loose 5 volts

[cashkennedy]

Re: sanyo DP32648 tv will not turn on

The mainboard might be grounding the voltage due to a bad component, or the power supply might be unreliable under load.

[CR Designs]

Re: sanyo DP32648 tv will not turn on

The mainboard might be grounding the voltage due to a bad component, or the power supply might be unreliable under load.

Ok any idea's on what to do now? What do you think the problem is the PSB or The main board?

[CR Designs]

Re: sanyo DP32648 tv will not turn on

Checked voltage again.As soon as the main board is connected back to PSB I lose 5v

[CR Designs]

Re: sanyo DP32648 tv will not turn on

Budm where should we start on this?

Budm Any input on whats going on with this TV?

[CR Designs]

Re: sanyo DP32648 tv will not turn on

Any body want to way in on this tv Tom66 any Idea's ?

[selldoor]

Re: sanyo DP32648 tv will not turn on

I think we may be all out of ideas tho' Budm has not been about much this
weekend.
It seems you may have a short on a complex main board. You can test as many components as you can, or try and trace the short or try and replace the board, but of course it may not be the only problem.
You could try something like this
https://www.youtube.com/watch?v=XhqwC3BFBug

[CR Designs]

Re: sanyo DP32648 tv will not turn on

I think we may be all out of ideas tho' Budm has not been about much this
weekend.
It seems you may have a short on a complex main board. You can test as many components as you can, or try and trace the short or try and replace the board, but of course it may not be the only problem.
You could try something like this
https://www.youtube.com/watch?v=XhqwC3BFBug

Selldoor I checked out the youtube video Have no freeze stray Have you ruled out a inverter problem see post 9 of picture of inverter. I couldn't find any fuses.
I have been checking around main board, but so many components. Is the PSB ruled out ? Selldoor thank you for the help

[cashkennedy]

Re: sanyo DP32648 tv will not turn on

The board markins say it suports 2.5amps on the 12v rail. You could connect a 12v bulb such as

http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051

with 20-30w power usage with the main board disconected. Then jump the power supply on and see if the voltage remains within 5% of 12v. Theres probably some cheaper 12v bulbs out there, just make sure the wattage is 20-30w.

If it does you know the main board has a short, Were gonna need a picture of the back of the board to trace the path to find a short. The main boards are fairly cheap ($30), so if you were 100% sure that was the problem, id probably recomend just replacing it unless you are more concered with knowledge then time / profit.

[CR Designs]

Re: sanyo DP32648 tv will not turn on

The board markins say it suports 2.5amps on the 12v rail. You could connect a 12v bulb such as

http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051

with 20-30w power usage with the main board disconected. Then jump the power supply on and see if the voltage remains within 5% of 12v. Theres probably some cheaper 12v bulbs out there, just make sure the wattage is 20-30w.

If it does you know the main board has a short, Were gonna need a picture of the back of the board to trace the path to find a short. The main boards are fairly cheap ($30), so if you were 100% sure that was the problem, id probably recomend just replacing it unless you are more concered with knowledge then time / profit.

Thanks cashkennedy, will have to pick up a bulb today,When I wire this up one wire on 12v rail and the other on the ground is this correct? wanting to learn more on how to do this