Sceptre X405BV-FHD3HF02205 no power

[vinceroger69]

Re: Sceptre X405BV-FHD3HF02205 no power

Do you know the background of the tv as budm says it looks like the ps.on signal is always on which comes from the mainboard could this tv took a lightening strike? which may of damaged the mainboard just a thought.

is there anyway too test just the psu to rule it out by jumping pins? at least it will confirm a mainboard fault.

[budm]

Re: Sceptre X405BV-FHD3HF02205 no power

Where are the names and pin number of the pins for CON4? You are not making it easy for us to help without putting the names of each pin.
GND
PS-ON
ADJ
BL-ON
+12V

[plbrand]

Re: Sceptre X405BV-FHD3HF02205 no power

My apologies, I didn't understand precisely what you were looking for. Hopefully the attached document provides the necessary info.

Dick, I don't see a board in my TV that looks like the one in your photo. If I'm missing something, please advise.

The TV failed progressively. Initially, if I unplugged it, waited a few minutes and tried again, it would sometimes come on and operate normally for as long as it remained on. The frequency of coming on after this re-boot increased quickly until it won't come on at all - just the red standby light.

Because of the progressive nature of the failure, it would seem unlikely for a lightning strike, but may be a possibility.

Again, thank all of you for your patience and help.

Paul

[budm]

Re: Sceptre X405BV-FHD3HF02205 no power

So the BL-ON (Backlights ON) is not present, that is from the main board, other Voltages and signals are fine.

[dick_barton]

Re: Sceptre X405BV-FHD3HF02205 no power

Dick, I don't see a board in my TV that looks like the one in your photo. If I'm missing something, please advise.
Paul

Sorry if it's the wrong board. What are the voltages on Connector 4?

[budm]

Re: Sceptre X405BV-FHD3HF02205 no power

http://www.shopjimmy.com/sceptre-kw-...t-inverter.htm

Sceptre KW-PIV400102A Power Supply / Backlight Inverter.
Pictures provided by shopjimmy

[dick_barton]

Re: Sceptre X405BV-FHD3HF02205 no power

Thanks budm for the correct pictures.

[plbrand]

Re: Sceptre X405BV-FHD3HF02205 no power

Connector 4 voltages are shown on the attached document. "BL-ON" voltage appears to be .20

Paul

[dick_barton]

Re: Sceptre X405BV-FHD3HF02205 no power

So Budm is correct and you are missing the Backlight On from the main board for some reason.

Edit:
Whats the part number on U1 on the underside of the board?

[budm]

Re: Sceptre X405BV-FHD3HF02205 no power

BTW, the PS-ON should toggle HIGH and LOW when power switch is togGle on and OFF, if not, then you have problem with not just the BL-ON signal but the PS-ON too.
At this point it is safe to say that the problem is on the main board.

[plbrand]

Re: Sceptre X405BV-FHD3HF02205 no power

Voltages do not change on BL-ON or PS-ON when the power switch is pushed on/off.

The part number for U1 (UA1) is:

TPA3110LD2
23Tg4
CO4L

The part number for the large chip U100 is:
MSD3391DS
A7MHA93ZB
1214D

Thanks again, if you guys are willing to continue to try, so am I!

Paul

[plbrand]

Re: Sceptre X405BV-FHD3HF02205 no power

Is it likely that the EEPROM on this board has failed? I notice the replacements are commonly available. Would this be worth a try?

Thanks again for all your help.

Paul

[ReeceyBurger123]

Re: Sceptre X405BV-FHD3HF02205 no power

Yes epprom failure so common on these junks.

[plbrand]

Re: Sceptre X405BV-FHD3HF02205 no power

Bought a replacement EEPROM from ShopJimmy, soldered it in and TV works perfectly.

Thank you guys for your help and guidance.

Paul

[kahall]

Re: Sceptre X405BV-FHD3HF02205 no power

Hello, This is my first real post here other than the intro.
It looks like there have been 2 successful repairs to this model from this thread and I just wanted to let you know there are now 3.
I have one of these that just quit about 10 days ago. I googled around and came upon this thread. I followed what was posted on the 1st page and when I saw the results for diodes D10, 22, 23 and my D10 was reading 0v compared to the others I gambled and figured that was the culprit since my results were similar to the original posters. Ordered it from digikey, received it today and soldered it in place and so far so good. It's working as it was before.
I actually enjoyed fixing it and saved $300 or so.
I'm going to keep my eyes peeled for others with T.V. issues and try to repair those as well as I have free time I need to fill so I will be back.
Thanks,
Kirk

[coolbone83]

Re: Sceptre X405BV-FHD3HF02205 no power

Hi everyone, sorry to bring this back from the dead. I am having the same problem that plbrand was having with his sceptre tv. STBY light on...won't power on. Same model, same boards. I am also getting the same readings on the pins. Is there a way to bypass the main board with a jumper so i know for sure that it is the problem? I am having trouble finding an EEPROM that matches my board #s exactly and according to shopjimmy it has to be EXACT....the closest is 1 number off. According to SCEPTRE they sell the whole board...but I would still like to be sure. Thank you,

Trevor

[vinceroger69]

Re: Sceptre X405BV-FHD3HF02205 no power

try freeze spray on the eeprom ic if the set now starts up ok you can remove the ic and freeze it again and copy the data the write the data back too a new ic i know this is not the same make of tv but this video gives you a idea what too try
https://www.youtube.com/watch?v=Qy8f...t=WL&index=114

[kahall]

Re: Sceptre X405BV-FHD3HF02205 no power

I have repaired this TV once and posted in this thread a few years ago saying so. It now has the same symptoms as plbrand had on his and is still in the such a state that I can fiddle with the button and unplug/replug and get it to come on so I don't have it apart yet. plbrand replaced the eeprom which I am just going to try.

Would someone be so kind as to use one of the many pics of the board in this thread and point out where the eeprom is?


I can handle it from there.

Thanks!

[vinceroger69]

Re: Sceptre X405BV-FHD3HF02205 no power

I have repaired this TV once and posted in this thread a few years ago saying so. It now has the same symptoms as plbrand had on his and is still in the such a state that I can fiddle with the button and unplug/replug and get it to come on so I don't have it apart yet. plbrand replaced the eeprom which I am just going to try.

Would someone be so kind as to use one of the many pics of the board in this thread and point out where the eeprom is?


I can handle it from there.

Thanks!

if you look on the shopjimmy web site im sure when you search for the eeprom it gives the board number location

[kahall]

Re: Sceptre X405BV-FHD3HF02205 no power

if you look on the shopjimmy web site im sure when you search for the eeprom it gives the board number location

Oh, I see that now. Thanks for the tip.