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**capkid** · 08-15-2013, 10:21 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Are any LEDs lit on the front of the TV when it's plugged in? Also, with the TV unplugged, check the white ceramic fuses for continuity on the Y-Sustain and Z-Sustain boards with a multimeter. If you're unsure, the Y-Sus is the big board with large heat sinks to the left of the power supply, and the Z-Sus is the board with large heat sinks to the right of the power supply.

Edit: Be careful adjusting the voltage knobs. Those voltages have to be fine-tuned to the panel specifications, and incorrectly adjusting them could cause problems.

**martino** · 08-15-2013, 10:28 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

I have that exact TV here with the Y-sustain board broken,if you guy's need any comparing voltage etc from power supply or anything let me know and I will be more then willing to supply the readings from my TV....Can't give you any technical advise as I'm a noob.But would gladly try and do something back for the excellent advise on this forum...

**capkid** · 08-15-2013, 10:46 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Originally posted by martino View Post

I have that exact TV here with the Y-sustain board broken,if you guy's need any comparing voltage etc from power supply or anything let me know and I will be more then willing to supply the readings from my TV....Can't give you any technical advise as I'm a noob.But would gladly try and do something back for the excellent advise on this forum...

Have you resolved the issues with your Toshiba? If not, and you want to start a separate thread, I'd be willing to help if I can. I've worked on three of these 50" Toshibas and a ton of similar 50" LG-based TVs. Others here have a fun under their belts, also.

**martino** · 08-15-2013, 11:04 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

I'm still on the hunt for a Y-sustain board....I wasen't trying to hijack this threat,more offering to help if you need a similar TV to get readings from

**capkid** · 08-15-2013, 11:17 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Originally posted by martino View Post

I'm still on the hunt for a Y-sustain board....I wasen't trying to hijack this threat,more offering to help if you need a similar TV to get readings from

Have you attempted to repair your existing Y-Sus?

**martino** · 08-15-2013, 11:28 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

The big IC units under the big cooling blocks are toast,heard it's a bit of a beaver to unsolder etc..priced the IC's out,came to 95 bucks,Complete board 130..
If you like I could start a new thread and we can discuss mine if you want??
I feel like I'm hijacking odins thread here,and don't wanna do that to him

**capkid** · 08-15-2013, 11:38 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Originally posted by martino View Post

The big IC units under the big cooling blocks are toast,heard it's a bit of a beaver to unsolder etc..priced the IC's out,came to 95 bucks,Complete board 130..
If you like I could start a new thread and we can discuss mine if you want??
I feel like I'm hijacking odins thread here,and don't wanna do that to him

Yeah, that's what I mentioned a few posts ago: You can start a new thread so we can address your issue. Anyway, it looks like someone in Canada is offering a repair service. If that complete board for $130 isn't a new board, I wouldn't touch it: http://www.ebay.com/itm/YSUS-Board-6...item27b575a6b9

Edit: Here's a video by norcal715 that guides you through replacing the ICs: http://www.youtube.com/watch?v=Y8MNQYXw8E0

Edit 2: The repair service mentions only replacing one of the IPMs; occasionally, in their words, both need to be changed. Most will tell you that both should be changed at the same time, so I'd ask about that if you consider their service.

**Odin8989** · 08-16-2013, 12:08 AM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Yeah the LED on the front of the TV turns on, when it turns on it's green, and when it turns off it's Red. I forgot to mention that I did in fact check all the fuses, they are good. The person who we got this from had messed with the voltage nobs on it, so I figured I couldn't hurt it anymore by doing the same. lol Is there some place that I can find the correct position for all of them?

I wont begrude you that much for hijacking my post martino. Just a little. :P

**martino** · 08-16-2013, 12:12 AM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Originally posted by Odin8989 View Post

I wont begrude you that much for hijacking my post martino. Just a little. :P

Haha.....Like I said,merely offered to help you with your tv by offering you with certain measurements from mine,then we got side tracked onto my tv,lol...
I will be following this thread with interest but won't mention my tv anymore,lmao...

**Odin8989** · 08-16-2013, 12:51 AM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

lol I don't mind if you keep talking about your TV here it might help me with my problem, you never know what could happen.

**capkid** · 08-16-2013, 01:21 AM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Unfortunately, the positioning is based on measurements with a multimeter. With the TV unplugged, what I would do is adjust each of the knobs to their midway points for now.

To start diagnosing, I would probably disconnect the Y-Sus and Z-Sus from the power supply to see if your power supply (PSU) outputs correct and steady voltages. VS and VA are the important panel output voltages to check on the PSU. Obviously, if your PSU stays on with Y-Sus and Z-Sus disconnected, you'll have to adjust the VS and VA knobs to match the voltages on the label at the top of the panel. Judging by your first picture, you may have some sort of issue related to the panel (not necessarily the panel itself), or you may have a combination of panel and PSU issues.

**Odin8989** · 08-16-2013, 11:35 AM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

What do you mean by the panel? I followed everything you said but that.

**tom66** · 08-16-2013, 11:44 AM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Panel = plasma display panel = the actual plasma screen.

**Odin8989** · 08-16-2013, 05:03 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

I unplugged both the Y & Z boards and you can still hear the power supply clicking on....off....on....off. So what should I try next?

**capkid** · 08-16-2013, 05:46 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Ok, so it sounds like your PSU has a fault. I just remembered that one of the Toshibas I worked also had a bad PSU; I'm used to these mainly having sustain issues. Tracking down the issue may not be easy on this PSU. So, you can try to fix it on your own, or you can use a repair service like Coppell offers (very reputable company): http://www.ebay.com/itm/APS-219-E135...-/110654425901

Edit: This price is $10 cheaper - they may not have updated their pricing: http://www.coppelltvrepair.com/p/324...repair-service.

Used boards are a little as $35 on eBay. This one is close by in Georgia: http://www.ebay.com/itm/TOSHIBA-50HP...item1c355ee5c5

Edit 2: Sorry. You can try scanning the board with a flashlight to see if you can locate a burned component. Personally, I would just buy a used board if this reveals nothing.

**Odin8989** · 08-16-2013, 05:49 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

You have any ideas about where I could start looking for what could be wrong? I'd like to fix it if you have any ideas.

**Odin8989** · 08-16-2013, 05:57 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Yeah I was actually just looking those up a few moments ago. I think that's what I'll end up doing is buying a new one. I hope it fixes it and I can use the TV again. Would the bad PSU make the screen look weird like that as well?

**capkid** · 08-16-2013, 06:33 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Like I mentioned previously, you probably have a couple issues. I'd try a cheap PSU replacement in an attempt to stabilize your PSU voltages, then I'd tackle any residual issues.

Edit: I don't have a lot of experience doing standalone voltage tests on the PSU, but you may be able to disconnect all the boards at the PSU and force the power supply on using a resistor from ground on the PSU to a pin on the PSU. I believe it's the RL_ON pin on the CN801 connector. Someone else may have a better idea of how to do that. My thinking here is to eliminate the logic board or main board as potential causes of the clicking issue.

Edit 2: Here's a video by norcal715: http://www.youtube.com/watch?v=dVaC2KVVLvs. If I remember correctly, RL_ON is the equiv. of PS_ON in LG TVs.

**Odin8989** · 08-16-2013, 06:33 PM

Re: 50HP66 Toshiba TV Turns On & Off And Wont Stay On

Alrighty, I'll get the PSU and let you know what happens after that.

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