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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-13-2016, 07:40 AM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

2009XV645046 firmware works for any XV645U model but may need setup adjustment - see technical bulletins for instructions.

The firmware installation instructions are on the last page of the service manual 52XV645U or 40XV645U. Also attached are some bulletins with helpful information. Hope this helps others with similar problems
...

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-12-2016, 04:52 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

SOLVED!

Good news, I managed to find a copy of the firmware 200946xv645045 through information on Tomsguide.com and after installing it, the TV works again. So far (1 hour) with no issues. Just before this issue arose I had connected a new antenna to the TV (a China made version with amplifier) and that must have sent a signal or voltage that knocked out the firmware on the main board somehow? Anyway, there obviously was no hardware problem which I was only able to determine with the service manual.
...

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-12-2016, 12:15 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

I'm not having any luck finding info on google, it just returns lots of sales info that I don't understand.
Here are the IC numbers
IC161 = D051A 9T08 - I think this is a voltage regulator
IC160 = 935 665A
IC506 = 558E 09F1
IC512 = DX095M
IC921 = Z1017AI ZD9T14
IC901 = Z1094DI ZA9V21
IC931 = X2367DNE 96728587 MPSP32
IC770 = 935 761A

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-12-2016, 10:32 AM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Numbers on top of IC112 are: 930 761Y and a symbol that looks like Microchip Technology or Arizona Microtek

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-12-2016, 09:52 AM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Hi Dick_Barton, how does one "freeze the EEPROM" and where is the EEPROM? on the board?

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-12-2016, 07:38 AM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

There are two LEDs on the front of this set. One is titled "Power" (I presume STandby?) and the other "On-Timer".
The 'Power' LED blinks green in series of 3 blinks repeated. It seems to correspond to Mode 18 of the LED indications chart

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-11-2016, 08:46 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Here is the updated voltage readings showing the pin numbers to match the manual...

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-11-2016, 08:43 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

I have not been able to find a service manual for this TV but did get one that shares the same boards and layout (power board in the manual is not an exact match), though it does not have any schematics. From following the troubleshooting guide it looks like it is probably the Main Board or the firmware.
I was going to try re-installing the firmware first, but I could not find a copy of the latest firmware anywhere. If anyone has Toshiba firmware versions 2009XV645045 or 2009XV645046 it would be really helpful....

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-10-2016, 09:09 AM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Budm, I missed your second post from earlier, hence the redundant information i posted.
I followed your suggestion and disconnected the T-Con board from the Main board but nothing changed.
The backlights don't flash or come on at all. Is there a way to confirm they are still good and the LCD?
Is it definitely the Main Board? If so I could try changing it.

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-08-2016, 09:10 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

I did some more testing. There is a connector with 4 wires between the Main Board and the Inverter board. One of the wires (they are not designated) has 3.29V from when the power is plugged in which doesn't change. None of the other wires have any voltage at any time.
There is a two wire cable from the T-Con board to the Invertor board which has 1.6V from 9 sec after pushing the Power button until 22s and then it drops to 0V.

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-07-2016, 11:05 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

BTW, I also checked the capacitors and the two fuses on the Inverter board and they all appear good.

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-07-2016, 11:03 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

I followed the traces on the Power Board for S_24V and it is actually not connected to anything. The trace has lots of locations for components, but none are mounted, so it seems to be an option that is not implemented on this board.

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-07-2016, 08:22 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Oops, meant to upload the picture version, here it is for easier viewing...

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-07-2016, 08:16 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Hi Budm, I captured as much of this info as possible in the attached table. It shows the voltages with power to the TV and before the Power Button is pressed, after the Power button is pressed, after 9 sec (relay clicks), after 22 sec (another click), after 25 sec (third click and led on Control board goes off, and finally after 58 sec when the TV shuts itself off and then stays in that condition unless unplugged.
For POW_SIG it stays at 0V until 9 sec point when it goes to 2.92V and then it drops back to 0V at...

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-06-2016, 10:22 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Managed to get the voltage reading from C820 and C821. They seem to be wired in parallel. The voltage is 162V with the power to the TV. Then, after pushing the Power button it is 162v, after 9 sec a relay clicks and the voltage jumps to 390V, then after 22 sec another relay clicks and the voltage starts dropping slowly back to 162V and then stays there.

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-05-2016, 10:20 AM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Hi Budm, thanks for helping me out here. I'm not experienced with electonics, so sorry for not understanding.
Are you asking me to measure the voltages on the board?
Are there specific points I need to take the voltage measurements?

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-04-2016, 09:20 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

I also get 160V DC on the Bridge Rectifier. It goes before = 160V, After = 160V, 9sec = 160v, 22sec drops to 135v, 25sec back to 160v and stays there even when TV shuts itself down. I assume this is normal?

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-04-2016, 07:47 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

I rigged up some loads and tested the outputs from the power board
There are 6 states of the TV.
Before pushing the power button = before
Immediately after pushing the power button = After
9 seconds later (relay clicks on power board) = 9s
22 seconds after pushing the power button (relay clicks on power board) = 22s
25 seconds after pushing the power button (relay clicks on power board) = 25s
Power shuts off after 58 seconds

I attached a matrix of voltages...

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-03-2016, 10:49 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

"Check those 3 white low Ohms power resistors R851, 897, 898 to see if one of them has open circuit."
I checked them and and the resistance is R897 = 0.6 Ohm, R898 = 0.7 Ohm, R850 = 1.9 Ohm

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Paddy707 replied to Toshiba Regza 46xv645u won't turn on, blinking power led

in Troubleshooting TVs and Video Sources

06-01-2016, 11:06 PM
Re: Toshiba Regza 46xv645u won't turn on, blinking power led

Thanks for responding. That is the correct power board.

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