Sceptre tv Model - E32

[TVAddict]

This tv came out the box not working, Its a combo TV/DVD 32inch tv, it has red standby light but no response what so ever from remote or buttons on the tv.

It's one of those AIO boards both mainboard and power in one,good strong 158-160 volts on the mains cap, i checked for stby voltage which is steady at 5v also has voltage at the buttons which is 3.2v
there is 5v at the remote IR sensor (both supply and signal back out - so its awaiting commands) finally there is 20v at the led/backlight connector, backlights seem fine all light up with my led tester with the same 20 - 25v or so.
NOTE : all voltages was taken with the set just plugged in.

Nothing seems blown or shorted as far as i can tell, I'm guessing some sort of processor or eeprom issue? with no schematic it is/seems a tough case.

What do you guys think, any advice is appreciated, a few pics ( pic 2 is with all connectors hooked up and for better visual pic5 is with all connectors off)

[dskall]

Re: Sceptre tv Model - E32

Are you getting a change at the connector when you press the power button? Are you getting 1.8v? Voltage at lvds connector?
Are you getting 12v on blue upgrade pins?

[lotas]

Re: Sceptre tv Model - E32

The symptoms are similar to the firmware crash in Spi flash, if there is a programmer, read the data (Dump) and post it here, I will check it if it is not working, then I will fix it.

[TVAddict]

Re: Sceptre tv Model - E32

Are you getting a change at the connector when you press the power button? Are you getting 1.8v? Voltage at lvds connector?
Are you getting 12v on blue upgrade pins?

I do have 12v at the blue upgrade pins ( there's nothing connecting to it )
I even have 12v at the DVD connector pins, i even tried sticking a disc in just to see if it would do anything, of course nothing.
The CPU felt normally warm to the touch, so it's doing something.

Will have to get back to you on the first 3 questions...

[TVAddict]

Re: Sceptre tv Model - E32

The symptoms are similar to the firmware crash in Spi flash, if there is a programmer, read the data (Dump) and post it here, I will check it if it is not working, then I will fix it.

Oh my, i'm afraid you lost me there lotas
I don't have any tools to get the data.

But it seems you're suggesting the tv may have some sort of a software issue with the chip you circled, is this the eeprom, can i possibly change it out and hope for the best..

[dskall]

Re: Sceptre tv Model - E32

In standby you should have voltage on pin 8 of your eeprom. 1.2v core voltage. You have other voltages. Then when you press power you should get a change of voltage on one of the pins of your button connector. If you have those then it is probably an eeprom fault.

[Diah]

Re: Sceptre tv Model - E32

I do have 12v at the blue upgrade pins ( there's nothing connecting to it )
I even have 12v at the DVD connector pins, i even tried sticking a disc in just to see if it would do anything, of course nothing.
The CPU felt normally warm to the touch, so it's doing something.

Will have to get back to you on the first 3 questions...

from your all voltage reading it look fine..... so
you need to disassembly the DVD tray cover and do manual disk in .. its mechanical action since you have the voltage there.. if it blocked or any micro switch of the mechanic defect it will block the TV section too.

[TVAddict]

Re: Sceptre tv Model - E32

from your all voltage reading it look fine..... so
you need to disassembly the DVD tray cover and do manual disk in .. its mechanical action since you have the voltage there.. if it blocked or any micro switch of the mechanic defect it will block the TV section too.

I actually totally disconnected the dvd section, still no response, but i'll try what you suggested in case the tv needs everything to work before it can turn on

[TVAddict]

Re: Sceptre tv Model - E32

Did a couple more checks today with respect to the questions dskall had asked

0volts on any pins on the LVDS cable ( i guess because the set isn't turning on)

when i hit the PWR button the 3.2v on the connector positive pin momentarily goes to 0v

As for the eeprom voltages i do have 3.2v as well as other voltages, see pic for more details, i observed each pin voltage on the eeprom while pressing the PWR button, there was no change to any of them, all voltages stayed where they were.

Did not have time to get into the dvd unit like Diah suggested and try a manual trigger/engagement.

There's one other thing i might try, it has a VGA connector for a PC, i might hook that up and see if it would turn on via a PC??

After that i guess it's looking like a replacement board is the next step or replacing the eeprom??

[dskall]

Re: Sceptre tv Model - E32

In standby you should have 12v, 5v, 3.2v, 1.2v.
When you press power you should then get in addition 1.8v for DDR.
Here's schematic with your processor but different board.

[TVAddict]

Re: Sceptre tv Model - E32

In standby you should have 12v, 5v, 3.2v, 1.2v.
When you press power you should then get in addition 1.8v for DDR.
Here's schematic with your processor but different board.

Thanks so much for finding the schematic, i'm a little lost as to which pin on the processor i should have 12v?
I don't see it on the processor diagram in the schematic.
In the meantime i will check the other voltages tomorrow,Thanks.

[TVAddict]

Re: Sceptre tv Model - E32

Finally checked the voltages on the processor, here's what was different from the diagram, these are the reading i got while tv was in stb just plugged in:

pins 4 -14 : 3.2v

pins 111 -112 : 5v

pin 114 : 0v

pins 117-118 : 3.2v

pin 125 : 1.4v

I got all the other pin voltages according to diagram, including the 1.8v for DDR

I still am not sure of the 12v reading, would this refer to a power supply voltage?
So going on this, do you think i may have a bad processor?

Thanks for your HELP everyone.

[dskall]

Re: Sceptre tv Model - E32

No 12v on processor. It will send a signal to trans./mosfet to supply 12v to panel. There are video's of this problem on youtube. Comboboard stuck in standby. They will go thru voltages. Usually it is a voltage problem