Toshiba 37" inverter board failure

[whatusername]

Re: Toshiba 37" inverter board failure

http://www.digikey.com/product-searc...=0&pageSize=25

[budm]

Re: Toshiba 37" inverter board failure

So the cap CE92, CE901 are not shorted, then put them back in and verify that there i still no shorts. DE91 is 15V Zener diode.
Do you have any Zener diode?

[whatusername]

Re: Toshiba 37" inverter board failure

does it matter which way ce92 and 901 go in? being its a cap is there a neg and pos side?

[budm]

Re: Toshiba 37" inverter board failure

They are brown rectangular shape, right? then No polarity on those two ceramic cap.

[whatusername]

Re: Toshiba 37" inverter board failure

just put ce901 back in and the board is shorted

gonna remove it and try ce92

[whatusername]

Re: Toshiba 37" inverter board failure

or should i just replace them both along with de91?

[budm]

Re: Toshiba 37" inverter board failure

We need to verify that we do not have internal shorts between PIN 2 (IN) and PIN3 (SW) of the IC. The reason is that the 15V Zener is shorted out can be due to the 24V is fed through the shorts inside the IC and dump 24V instead of 12V at the output.

[whatusername]

Re: Toshiba 37" inverter board failure

tested no short on ic

[whatusername]

Re: Toshiba 37" inverter board failure

sorry i see u mean the ic... no short between 2 and 3

[budm]

Re: Toshiba 37" inverter board failure

OK, so far you found shorted out DE91 15V Zener, and shorted cap CE901 (10uF 16V), without those two parts installed, the shorts is no longer there. What you can do now is to removed those two wires for the 12VLCD that goes to the main board, connect 100 Ohms 2W resistor to the 12VLCD pin of the power supply and power up the TV to see if you do have 12VDC on the resistor. I want to verify just to be sure it does not put out 24V which will damage the T-CON and it will also trip the over voltage circuit.

[whatusername]

Re: Toshiba 37" inverter board failure

unfortunately i do not have a 100ohm 2W resistor i do not have any resistors i also did not test ce92 on the board alone to see if it was shorted i tried to test it off the board with the dmm in 200 ohm but all i got was open both ways

[whatusername]

Re: Toshiba 37" inverter board failure

these caps would they be general types? or high q types? i figure since they are tiny the case code is 0805 but i cant tell what the Temperature Coefficient / Code is or Operating Temperature Range

[whatusername]

Re: Toshiba 37" inverter board failure

may i should select the highest.. 55-125 deg celcius

[budm]

Re: Toshiba 37" inverter board failure

CE92 is fine, not shorted. We cannot just take a chance without using dummy load first, otherwise you can badly damage the T-CON board. Do you have 120V light bulb? You can use 60W bulb as a load (cold resistance of the lamp is about 20 Ohms).

[whatusername]

Re: Toshiba 37" inverter board failure

i have a 40w i just shut off and took out the socket will that work?

[budm]

Re: Toshiba 37" inverter board failure

CE92, 901: From service manual
TOSHIBA P/N 75005814. Part description: CAPACITOR, CERAMIC CHIP, 2012 GRM21BB31C106KE15L
Made by MURATA.

[whatusername]

Re: Toshiba 37" inverter board failure

i am gonna order 10 of those 100 0hm 2 watt resistors just to have them

[budm]

Re: Toshiba 37" inverter board failure

40W will work, just solder two wires to the lamp then solder them to the 12VLVCD pin on the power supply, you must disconnect those two 12VLCD going to the main board, you can cut the wires and splice them back together later.

[whatusername]

Re: Toshiba 37" inverter board failure

this is my mouser cart so far.. plse tell me if its good to go http://www.mouser.com/Cart/Cart.aspx

[whatusername]

Re: Toshiba 37" inverter board failure

2 wires to the bulb? i assume one on the ground body and 1 wire on the tip? then connect the ground bady wire to chassis ground? and tip to lvcd 12v pin?