Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

[nomoresonys]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

be very careful on the hot/primary side of the board high voltage in places, the big filter cap can easily have enough voltage to kill.

[angelos]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Where did you measure off these readings?
5V 5.15
Red 3.30
GRN 0.14
IR 5.07
GND 0
K0/S 3.30
K1/C+ 3.30
K2/C- 3.30
K3/V+ 3.29
K4/V- 3.27
K5/M 3.23
K6/P 3.31
K7/N 3.31
GND 0

[Seville]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

I measured the voltage readings from the backside of the board. The pin markings were there.

[Seville]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Thanks for the caution note, nomoresonys!

[angelos]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Can you take a photo of the markings where you took your measurements?
Also i want to know if you have a standby light?

[Seville]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Attached photo of the ports where the voltage readings were obtained and the lit red standby light.

When I press the power on button on the tv, nothing happens. Also, when I try the remote control power button, nothing happens, red standby light stays lit.

Would anyone know which ports to jump to force a turn on? Is that a good next step, or something else. Thank you for your questions and suggestions!

[angelos]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

I have attached a photo for you to see. Take a clear photo of the area in red. As far as i can remember there is a low drop out voltage regulator. Something with a marking like "1118". Its a 8 pin surface mount ic.
Pin 2 and 4 must have 5V on it but pin 5 needs to be 3.3V exactly
Pin 8 is 1.8V
With mine i always find out that the pin 5 (3.3V) is fluctuating around 3.1V and then the tv will not start up.
Please measure there and get back to me.
I have added the datasheet of the IC in question if you are not sure.

[Seville]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Thank you for the suggestion! Photo attached and here is what I measures at each pin for this 1118 component.
Pin 1 0v
Pin 2 5.15v
Pin 3 0v
Pin 4 5.16v
Pin 5 3.34v
Pin 6 3.34v
Pin 7 1.82v
Pin 8 1.82v

All seems to be good with this test. Keep the suggestions coming, please and thank you!

[angelos]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Ok, then you can switch on the unit and feel if anything is getting hot, like the processor etc. My bet is for now that your firmware is corrupt. To fix that you might need to get the firmware update from Westinghouse. If nothing then to the bin it goes.

[nomoresonys]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

dont know if you bought this tv or not, but good policy is avoid westinghouse.

[nomoresonys]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

https://www.consumeraffairs.com/home...o_reviews=true sure some give it 4 or 5 BUT theres a whole lot of 1's.

[lotas]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

If you have a programmer, try to read the dump and put it here, I'll look at the contents, and if the problem is in the firmware, then I'll try to fix it.

[Seville]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Wow, thanks for all of the support! Very impressive group willing to help here.

As an alternative, could I swap this ONN board currently on eBay with the Westinghouse board. It has the same footprint and connections.

ONN - ONC18TV-000 Mainboard TP-MS3553 - PB801 ROKU

[Seville]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Thanks for the offer Lotas.

Not sure how I would do this, but interested in learning on how to read the dump.

"If you have a programmer, try to read the dump and put it here, I'll look at the contents, and if the problem is in the firmware, then I'll try to fix it."

[lotas]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

There may be a different firmware, for a different panel, for a different remote control.

[vinceroger69]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Thanks for the offer Lotas.

Not sure how I would do this, but interested in learning on how to read the dump.

"If you have a programmer, try to read the dump and put it here, I'll look at the contents, and if the problem is in the firmware, then I'll try to fix it."

one of these programmers would probably work ok to read this chip
https://www.ebay.co.uk/itm/203585702...3ABFBM_q306fxg

[nomoresonys]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

voltage adjustable one there: https://www.ebay.com/itm/40373082870...Bk9SR7Dpy_78YA

[Seville]

Re: Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply

Thanks for the suggestion and eBay links on the eeprom readers/programmers.
You taught me something new about other various paths that could be taken.

Unfortunately, this is a bit out of my technical league on performing the download/upload.

Surfing the web tonight, I located a replacement board which I did not have any luck in finding over the last couple of weeks. It must have became newly available. I ordered it and will update when it arrives.

A "Midwest Nice" thank you for all of your guidance!