Thompson 32HS3033 dead. All voltages OK but one for buttons

[edugimeno]

Hi!
I have this TV that won't light up the stby led, won't turn on, etc
Opened it and found all expected voltages in the backside test pads BUT one. There are a lot of +5V sources but one of them, the one that's driven to the backpanel keys module.
There are lots of other +5v points working but this one specifically is dead.
I took a close picture of the area where this voltage is generated
There is a LD05 missing but this may be from factory? Should I short it?
All the thru-board capacitors have a steady and valid voltage on them
The small SMD caps by the faulty +5v source are not shorted

What else can I try?

Thanks!

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

You could have lost the firmware, from power surges in the network, if you have a programmer, then try reprogramming this spi flash, I will provide you with a working firmware.

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

You could have lost the firmware, from power surges in the network, if you have a programmer, then try reprogramming this spi flash, I will provide you with a working firmware.

Would that be a cause for the STBY led to be off? Can the firmware control that?
How can I determine that? I mean I don'¡t have an SPI programmer here right now, I could get one but I would like to determine if the firmware is the culprit before buying one

Thanks a lot!

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

On 8 pin. does spi flash have 3.3v?, besides 5v the board should have 1.1v, 1.8v or 2.5v and 3.3v do you have them?

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

I have measured all those voltages at different test pads (specific for Vxx_yy) around the board, including some other +5vcc, but I don't know if specific 3.3v for SPI is present
What do you mean with "on 8 pin"? A specific socket ? Or IC?

Thanks

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

I have measured all those voltages at different test pads (specific for Vxx_yy) around the board, including some other +5vcc, but I don't know if specific 3.3v for SPI is present
What do you mean with "on 8 pin"? A specific socket ? Or IC?

Thanks

spi flash has 8 pin (+3.3v), 4 pin (GND).

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Here on these inductors and converters there should be output voltages relative to the ground.

[Rajnhl]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Would that be a cause for the STBY led to be off? Can the firmware control that?
How can I determine that? I mean I don'¡t have an SPI programmer here right now, I could get one but I would like to determine if the firmware is the culprit before buying one

Thanks a lot!

yes firmware problem can cause no standby light.
before doing anything ,take backup of firmware and reprogram your tv.

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

I will give this TV its last chance... Is this a valid programmer (see photo) to dump/write this flash IC? I just found it in some old boxes I had around...

I will check voltages first...

Thanks

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

yes firmware problem can cause no standby light.
before doing anything ,take backup of firmware and reprogram your tv.

Thanks Rajnhl, I found time today to check this. I tested the SPI Flash and it IS getting +3,28V on Vcc so I believe that this is correct.
Should I assume in this case that the issue is in the firmware?
Can I get some directions, if that's the case, to backup and reprogram the firmware?
Is the interface I showed above valid for this?

Thanks a lot!

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

This programmer will not work, here you need at least the simplest, most accessible and cheapest one - CH341A and an adapter for it for your spi flash.

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Ok I see. I just ordered a CH341A based programmer interface with the SMD clip
It will take 2 weeks to be delivered.
Where can I find the correct firmware to upload? This IC is Winbond 25Q64FVSIG

Thanks!

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Ok I see. I just ordered a CH341A based programmer interface with the SMD clip
It will take 2 weeks to be delivered.
Where can I find the correct firmware to upload? This IC is Winbond 25Q64FVSIG

Thanks!

Well, when the programmer arrives, then we'll talk and help with the firmware.

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Ok. So today is the day.
The programmer arrived and I was able to read the current content from the flash IC
BIN files is attached. I can't find any other reference bin file online.
Can you check if this file is ok and if not, share a working bin file with me?

Thanks a lot!

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Try.

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Ok, it took me a while and had to try 2 different programs, as one of them wasn't actually erasing the flash before programming, and when the new file was correctly programmed and verified, I tried to power up the TV with the new firmware but unfortunately there was no change
So I guess there is no firmware issue, there has to be something in hardware, but Im a bit lost on what to try first....
Thanks

[lotas]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Check the resistance of the input lines of the HDMI ports relative to ground, if there is low or short on these lines, then the processor has suffered.

[edugimeno]

Re: Thompson 32HS3033 dead. All voltages OK but one for buttons

Check the resistance of the input lines of the HDMI ports relative to ground, if there is low or short on these lines, then the processor has suffered.

Tested. No, those small smd components you pointed show no resistance to ground, nothing at all, infinite.
I checked the actual HDMI pins and 5 of them show GND, which is what the specs for HDMI pinout specify (5 GND pins)
Thanks