Toshiba 32L1350UD

[timbit]

Hi All.
Does anyone have a service manual for this TV?
It is dead, but there is voltage from PS to main board.

Why is Toshiba such a hard find for service manual? Everything else is out there.

Thanks in advance,

Tim

[Diah]

Re: Toshiba 32L1350UD

TOSHIBA didn't own their TV design or SW or HW too the most they bought licenses brand from Vestel so it will help when you post photos on the back side of the boards how they connected together and the label of MB and PSU

[budm]

Re: Toshiba 32L1350UD

Hi All.
Does anyone have a service manual for this TV?
It is dead, but there is voltage from PS to main board.

Why is Toshiba such a hard find for service manual? Everything else is out there.

Thanks in advance,

Tim

There are many Voltages and Control Voltages on the power supply connector, you need to show pictures and the Voltage readings of each pins of the power supply connector that goes to the main board, right now we have no idea as to what we are dealing with without seeing the pictures.

[nomoresonys]

Re: Toshiba 32L1350UD

After reporting those voltages. With tv unplugged from power, unhook cable from powerboard to mainboard, plug tv into power, see if backlight comes on and stays on.

[timbit]

Re: Toshiba 32L1350UD

After reporting those voltages. With tv unplugged from power, unhook cable from powerboard to mainboard, plug tv into power, see if backlight comes on and stays on.

Meter
pin 1 - 12Vcc - 12.67Vcc
pin 2 - 12Vcc - 12.67Vcc
pin 3 - 12Vcc - 12.67Vcc
pin 4 - GND - 0
pin 5 - GND - 0
pin 6 - 12_AUD - 12.67Vcc
pin 7 - GND - 0
pin 8 - 12V_LNB - 0
pin 9 - GND - 0
pin10 - 5V1 - 5.17
pin11 - AC_DETECT - 3.53
pin12 - POWER_TV - 3.32
pin13 - BL_On/off - 0
pin14 - 5V1 - 5.18
pin15 - PWM - 0.11

I did a tear down and tested the LEDs (3 strips) with a dc power supply and doing a continuity test. All three strips are dead.

[R_J]

Re: Toshiba 32L1350UD

How much dc voltage did you supply to test the led strips? Looks like there are 8 led's per strip. I doubt all 3 strings are open.
What did you test doing the "continuity test" ? the led strips?

[budm]

Re: Toshiba 32L1350UD

pin13 - BL_On/off - 0
pin15 - PWM - 0.11

It looks like you do not have Backlights on command or the PWM (Dimming) command from the Main board.

[timbit]

Re: Toshiba 32L1350UD

How much dc voltage did you supply to test the led strips? Looks like there are 8 led's per strip. I doubt all 3 strings are open.
What did you test doing the "continuity test" ? the led strips?

Did the continuity test with a meter and a continuity setting. ( and checked to make sure it worked first.) And did it on the LED strips one at time.
I applied about 20vdc .5 amp

[timbit]

Re: Toshiba 32L1350UD

pin13 - BL_On/off - 0
pin15 - PWM - 0.11

It looks like you do not have Backlights on command or the PWM (Dimming) command from the Main board.

So...ps or main is having the issue?

Tim

[nomoresonys]

Re: Toshiba 32L1350UD

With tv unplugged from power, unhook cable from powerboard to mainboard, plug tv into power, see if backlight comes on and stays on. Post #4, did you do this, it's a process, directions need to be followed or it just takes longer to get to the issue.

[Andrew F. Ali]

Re: Toshiba 32L1350UD

There is no BL-ON/OFF and PWM signals from the Main Bd. The BGA Chip could need some heating to fix this issue.

[timbit]

Re: Toshiba 32L1350UD

With tv unplugged from power, unhook cable from powerboard to mainboard, plug tv into power, see if backlight comes on and stays on. Post #4, did you do this, it's a process, directions need to be followed or it just takes longer to get to the issue.

Sorry. Yes I did. Nothing.

[budm]

Re: Toshiba 32L1350UD

So...ps or main is having the issue?

Tim

Main board issue.

[timbit]

Re: Toshiba 32L1350UD

So I have ordered a new main board. I will post a reply after it arrives. Thanks for all the help to all of you.

Tim

[cubytus]

Re: Toshiba 32L1350UD

So, I guess OP finally repaired his TV? I have the exact same model and symptoms only I couldn't test the LED strips as I've got no PSU able to push 20V.

[nomoresonys]

Re: Toshiba 32L1350UD

Test the voltages at the connector on the powerboard with EVERYTHING hooked up, it's the connector that the cable from powerboard to mainboard hooks into, most times there's a legend/map nearby that gives the expected voltages, you measure them with your mutimeter, set meter to 20 vdc then report them, put neg probe on chassis metal ground, pos probe on pin of connector, measure in standby take note, leave probes where they are then power on tv and again take note of voltages, report them here, example pin 1-ps-on-0 volts standby-power on-3.3 volts.

[nomoresonys]

Re: Toshiba 32L1350UD

Video example there, measure all the pins and report: https://www.youtube.com/watch?v=EQ4hWflmjEw

[nomoresonys]

Re: Toshiba 32L1350UD

Be careful what you touch on the powerboard, the HOT/DEADLY side has voltages in places that can easily kill, the measurements we are doing here are on the cold side.

[cubytus]

Re: Toshiba 32L1350UD

I took OP's list and updated with my values:

Meter
pin 1 - 12Vcc - 11.31Vcc
pin 2 - 12Vcc - 11.31Vcc
pin 3 - 12Vcc - 11.31Vcc
pin 4 - GND - 0
pin 5 - GND - 0
pin 6 - 12_AUD - 11.31Vcc
pin 7 - GND - 0
pin 8 - 12V_LNB - 0
pin 9 - GND - 0
pin10 - 5V1 - 4.86Vcc
pin11 - AC_DETECT - 3.13Vcc
pin12 - POWER_TV - 3.13Vcc
pin13 - BL_On/off - 0
pin14 - 5V1 - 4.86Vcc
pin15 - PWM - 0.1Vcc

This is from the cold side obviously, but the way the power board is made, the hot side is still very close and accessible.

[nomoresonys]

Re: Toshiba 32L1350UD

"pin13 - BL_On/off - 0" Sure looks like you have the same issue, no bl_on signal coming from the mainboard, replacement mainboard should do the trick.