Toshiba 55ZV650U No power

[CapLeaker]

Re: Toshiba 55ZV650U No power

I guess I am lucky only having 2!

[fatkid66]

Re: Toshiba 55ZV650U No power

Noob question alert: can i use a 1/2 watt 1K resistor?

[budm]

Re: Toshiba 55ZV650U No power

Yes.

[fatkid66]

Re: Toshiba 55ZV650U No power

Jumping 5vstby to powtv with 1K resistor with the main board dc'd only makes the relay SR80 change state. No leds, nothing else. The same thing happens when the main board is connected and set is plugged in.

[fzabkar]

Re: Toshiba 55ZV650U No power

the 2 replacable glass fuses are ok, there are 3 fusable resistors on the board...

I see 4 fusible resistors and 4 PCB fuses.

http://img-asia.electrocomponents.co...R377212-01.jpg

[pppp]

Re: Toshiba 55ZV650U No power

I have the exactly same tv and same issue as yours starting from this month. I just ordered the components and not start fix it yet. did you try to replace the STR-Y6456 (I saw someone talking about this part in youtube). for me, the resistor RGDU5M-5E is bad now. but also other part is bad too, which caused resistor RGDU5M-5E is broken.

I ordered the part is from here:
http://www.shopjimmy.com/toshiba-750...repair-kit.htm

[budm]

Re: Toshiba 55ZV650U No power

Is this your board?
http://assets.shopjimmy.com/media/ca...4752-top_2.jpg
The POW_TV is the PS-ON pin.

So the question is, do you have >2VDC at this pin when power switch is activated? If not, then the main board is nor sending the command to turn on the rest of the power supply or the PFC Voltage booster.
As other poster had indicated, bad relay/relay contact will cause the R850 to go open because that resistor is for the soft-start which is supposed to be bypassed by the relay contacts if the relay is OK to give the power supply the full power.
So you can have the problem with the main board + problem with the power supply board.

[fatkid66]

Re: Toshiba 55ZV650U No power

I will check voltage at powtv when switch is pressed n get back to you.

[fzabkar]

Re: Toshiba 55ZV650U No power

It might be worth taking a look at pages 18 - 25 of the 42HL196 service manual:


ftp://helpedia.com/pub/temp/datashee...shiba_42HL196_[SM].pdf

Pages 18 - 25 constitute the circuit diagrams for the PE0071 PSU. The PE0071 and PE0702 PSUs are by no means identical, but there are numerous similarities, and the design philosophy of the PE0071 helps to understand how the PE0702 works.

[jflo269]

Re: Toshiba 55ZV650U No power

how are you looking fatkid66? figure it out?

[mikemike123]

Re: Toshiba 55ZV650U No power

Hello Everyone,

I have the same model TV which just stopped working after a power off.

When I press the power button on the side of the TV and on the remote, the TV would not turn on. No relay clicking sound.

I also unplugged the TV from the outlet for a day and re plugged it back in and also the same problem. No power relay clicking sound.

So i dissembled the back cover of the TV and checked 2 of the fuse and they are not broken.

I've attached image and if you have any feedback on what to check, please let me know.

Whole Power Board - http://i.imgur.com/MFV4cfx.jpg
Right Side of Power Board - http://i.imgur.com/GrJoaq5.jpg
Left Side of Power Board - http://i.imgur.com/CLp40Fa.jpg
Capacitor Bulge? - http://i.imgur.com/A8crl3m.jpg
Capacitor Bulge #2? - http://i.imgur.com/IyJip9o.jpg

I did notice 2 of the bigger capacitors may be bulging a little.

If anyone have any suggestion on where to start, please let me know. Please also highlight any area of an image to show where to check etc.

[mikemike123]

Re: Toshiba 55ZV650U No power

anyone can help?

[fatkid66]

Re: Toshiba 55ZV650U No power

Ok, took a while, 3.28 volts dc at powtv before I even push the power button.
Pushing power button makes no change
If it is a matter of replacing boards, ill do it, just trying to narrow it down.

[CapLeaker]

Re: Toshiba 55ZV650U No power

So you put the 1k resistor between STBY 5v and Pow-tv. Did you put another 1k resistor from STBY to BLon (backlights)? The main board has to be unhooked, plug the PSU in and see what happens

[fatkid66]

Re: Toshiba 55ZV650U No power

I dont see a pin for the backlites

[fatkid66]

Re: Toshiba 55ZV650U No power



The pins are on the top left, no BL-on

[budm]

Re: Toshiba 55ZV650U No power

The BL-ON signal may not be routed through the power supply board connectors, we need to see the whole back side of the TV so we can see how all the boards are connected together. There should be some labels on the Inverter boards to tell you which one is the the BL-ON (INVR-ON) pin.