Hi,
Have a Canon HF100 Camera which the mini HDMI output jack fell apart, took unit apart and fitted new FFC flexible cable and connected to a standard HDMI socket. Wired as per manual connections, but although plugging into TV recognises the cable being plugged in, there is no picture.
Looking for some help to be able to test the output signals from the Camera.
I have a scope so should be able to see the communications between Camera and TV.
David
David-OLW
Member
Last Activity: 01-31-2017, 02:42 PM
Joined: 01-16-2017
Location: Stafford, Staffordshire
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HDMI testing souce to sink
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Re: Toshiba 19BL502B replaced diode worked, now not working
Replaced Led Driver Board and it worked.
Only lasted for 5 days and backlight not working again.
I think it's time to give up and buy a new TV.
I think it is still connected to do with the power supply as I have 11.5 volts and 27 volts. The 27 is probably putting high volts on Led circuit. Don't know how sort PSU to get 12 volts and 24 volts.
David... -
Re: Toshiba 19BL502B replaced diode worked, now not working
Yes...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Yes, well it's shows 27 volts...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
At the two red arrows I have zero volts.
On the TS61199 I have Pin1 = 0.17 volts and Pin 20 = 1.27 volts the rest are all zero volts.
Thanks David....Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Which are the connections to the LED's? the only connection other than the one from PSU is the one circled red which is a small ribbon cable is this the connection the LED's?
How to test the LED's?
Which components are the Boost Converter?
Thanks David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
All three diodes were replaced together from same lot.
Has it damaged Main Board as well because the PWM_DIM signal goes down to 0.23 volts.
David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Which are the connections to the LED's? the only connection other than the one from PSU is the one circled red which is a small ribbon cable is this the connection the LED's?
How to test the LED's?
Which components are the Boost Converter?
Thanks David...Last edited by David-OLW; 01-22-2017, 10:01 AM.Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Yes that was correct Led Driver board showed 0 dc volts.
Connected a 1K resistor between dim line on the LED driver board and the 5 volt standby but backlights do not come on, reading across 1K resistor 5.04 Main board side and 4.84 volts Led Driver Board side.
Thanks for all your help David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
That is coming from the main Board via the PSU board.
Because the PSU board is connected via a 20 Pin plug I could not see any way to disconnect the wire there and as the 6 way connector has wires going to the LED driver Board I cut the wire there and measured either way
Look at the PSU schematic the PWM_DIM appears to go straight through to the Main Board.
Is this just so the TV can control the Level of Background light?
Thanks David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Have cut wire from PSU to LED Driver board.
Coming from PSU/Main Board
on standby 0.312
Turned On goes to 3.4 and then drops back to 0.257
No voltages on wire from LED Driver board
Thanks David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
In standby it is zero on turning on it goes up to 3.09 volts then slowly reduces (over about 10 seconds) to 0.23, have repeated several times.
Thanks David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Pin 3 BKL_ON/Off when ON is 3.04 volts
Pin 4 PWM_DIM when ON is 0.23 volts
David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Many Thanks for your help.
I have 27.2 volts both sides of the fuse. Have checked all zero resistors with multi meter and have continuity across them.
David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Which Board has the LED Driver and inverter on then?. Where are the connections to the LED's? the main board only has a ribbon type cable from it.
Thanks David.Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Yes using a bright light I can see the Menu.
Thanks for your help
David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Yes I had read that thread.
Is there any where I can get the schematic diagram for the Main Board 23039106? Anyone know what components could be faulty. Is there any way to apply a voltage to Pin 4 on T-Con to check Backlight?
Thanks David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
On Pin 4 I have 0.23 volts, I am only measuring this with a multi meter, if it is PWM should I look at it the scope, should this be higher.
On the Diagram the only other place PWM_DIM is shown is on the Pin !3 on Main Board connector, does this signal come from the main Board.
Pin 1 and 2 27 volts
Pin 3 3.04 volts
Pin 4 0.23 volts
Pin 5 and 6 Ground
Thanks for your help
David...Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
Yes the red standby light comes and then using remote turns on to give green steady light....Leave a comment:
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Re: Toshiba 19BL502B replaced diode worked, now not working
How do I do That?
David...Leave a comment:
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