Re: Sceptre 40" TV X405BV-FMD8HM07 - No power
Thanks for all the help. I purchased a good used power board.
ellisol
New Member
Last Activity: 01-16-2019, 07:12 PM
Joined: 11-23-2018
Location: Griswold
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Re: Sceptre 40" TV X405BV-FMD8HM07 - No power
No I don't have tools to do SMD repair. I do have a good adjustable soldering iron and have replaced capacitors on another big screen TV power board successfully.
I was hoping for an easy fix like swelled cap or a blown fuse. I was also hopeful someone else had a similar problem with this board which could offer advise.
From the info I have provided so far does it point to the power board being bad? If so I could just buy a replacement.
ThanksLeave a comment:
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Re: Sceptre 40" TV X405BV-FMD8HM07 - No power
Sorry I am not providing the right info.
How do I find out the Pin identification for this board? (PSon, BLon, GND, etc)
I did find a table for board MLT666T (My board in MLT666FL) which has a similar layout that further identifies the pin outs. It is attached. (Pin identification table.jpg and Pin identification-rev.jpg )
Based on that info:
standby/plugged in but off
Pin-CON4
Pin 1, 2 GND +5V +5VSB +12VDC RETURN --->0 VDC
Pin 3, 4 +5V +5VDC OUTPUT...Leave a comment:
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Re: Sceptre 40" TV X405BV-FMD8HM07 - No power
Ok, I tested all pins on the connectors from mainboard to powerbard on powerboard side, with all the board cables connected.
See the attached "Pin numbers.jpg" file for pin numbers. The picture shows the cable disconnected but I tested with them connected. Test was done to chassis ground.
standby/plugged in but off
Pin 1 0 VDC
Pin 2 0 VDC
Pin 3 0 VDC
Pin 4 0 VDC
Pin 5 4.55 VDC
Pin 6 5.24 VDC
Pin 7 0.02 VDC
Pin 8 0.02 VDC
Pin 9...Leave a comment:
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Re: Sceptre 40" TV X405BV-FMD8HM07 - No power
The 5VSB pin has +5.23 DCV.
I will test all mainboard to powerboard pins with various power conditions and report back, hopefully tomorrow.
Thanks so much for the quick response.Leave a comment:
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Sceptre 40" TV X405BV-FMD8HM07 - No power
I have a Sceptre 40" TV X405BV-FMD8HM07 I am troubleshooting that has no power and no red power light.
I disconnected the video board and tested power. I have 160+ DCV at the large capacitor and +3.86 DCV at the 5V connector. I have zero DCV at the 12V and 24V connectors.
I am not sure what the fuses look like. I have basic electrical knowledge and have an volt\ohm meter to troubleshoot.
I would appreciate any help this forum can give. I see I can buy a power board for around $60.
Pictures attached
Thanks in advan... -
Re: Sceptre X405BV-FHD3 No power Won't turn on
I read with interest this thread. I also have a Sceptre of a similar model I am hoping to get some troubleshooting advise on.
I will create a new thread once I am approved.
Thanks, ellisol from IowaLeave a comment:
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