Question about Toshiba TheaterWide 50HP16 50 in. Plasma HDTV

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Toshiba 50hp66 power light cycles will not turn on

I have a Toshiba 50hp66 that the power light cycles from red to green with a simultaneous clicking of a relay on the power board. I check for power at a few points per the Toshiba service manual and iy is pointing towards the scaler board. I was wondering if anyone has a confirmed fix for this or the 50hp16. Thanks, Nick

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premtech
  • 934 Answers

SOURCE: Toshiba 50HP16 - no picture or sound.

Drummer,
Check mosfet at Q104 2SK2370 which will sub to an Nte2970 on the main power supply. Leakage can cause cycling but my bet is on the scaler board also. You say you have +5v at pin 11 of CP3201 and 3.3 at pin 2 of IC3804 - and all the troubleshooting charts and schematics I've reviewed suggest replacing the scaler board, Toshiba p/n# 72784101 and unfortunately they're about $240.00 dollars. But that sounds like the problem to me...
Bill

Posted on Dec 01, 2007

Old Drummer
  • 5 Answers

SOURCE: Toshiba 50HP16 No Power

I bought a Scaler board from someone on eBay but it did not fix the unit however I'm not sure the replacement was not a dud. I planned to send the board to PTS Corp but haven't yet. I have sent other boards to PTS wit good success. http://www.ptscorp.com/tech_support.html

Posted on Dec 30, 2008

dspider
  • 30 Answers

SOURCE: I have a Toshiba 50hp66 that the power light

Check the fuses on the ysus & zsus boards. Are any fuses on boards open . Disconect power cabels to ysus board first {board on left} . put tv on . if the light is green the ysus board must be replaced.

Posted on Aug 11, 2010

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Toshiba 50hp66 Plasma repeats power sequence without turning on


A case of which came first the chicken or the egg, Power supply board may be the issue or the sustain board--have you looked for the usual bad caps on the power board?

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My tv suddenly wont turn on. it powers on by itself then immediately goes off then starts the same cycle again. I checked the capacitors and non of them are blown. any ideas. when the tv tries to start, i...


Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
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Check and replace the damaged component/s at its main board. Contact any service technician. If you wish to get some details; check the site linked here.

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I got the red dots really bad on my toshiba 50hp66 after an hour or two of watching tv. I found out that if you open up the tv in the back on the left you will find two adjustment pots labelled Vsc and Vy. I took a sharpie and marked where the factory defaults were first. Then I adjusted the Vy pot down a little bit and the red spots were gone! My tv looks great again!

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1 Answer

I have a Toshiba 50hp66 that the power light cycles from red to green with a simultaneous clicking of a relay on the power board. I check for power at a few points per the Toshiba service manual and iy is...


Check the fuses on the ysus & zsus boards. Are any fuses on boards open . Disconect power cabels to ysus board first {board on left} . put tv on . if the light is green the ysus board must be replaced.

Mar 28, 2010 | Toshiba TheaterWide 50HP16 50 in. Plasma...

1 Answer

Toshiba 50hp66 The tv shuts off and the red light


Sounds like a system failure - one of the controller boards may have gone bad. If the unit is still under warranty, contact Toshiba for warranty service. Otherwise you will need to contact one of the authorized service centers or your local TV repair guy to arrange for repair.

Nov 08, 2009 | Toshiba 50HP66 50 in. Plasma Television

1 Answer

My Toshiba 50HP66 will not turn on. It powers up like it is trying to turn on, then it makes a clicking sound and turns off. It will do this over and over until I unplug it.


Most TVs have a "Protection Mode" that turns the unit off when it detects a failed part inside the tv.
The most likely the tv has a power supply related problem. I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.

I hope I shed some light on the subject for you.

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2 Answers

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hy i got a toshiba 42" LCD tv ,when i press the power boton
iget the red light,& it stay that way ontil i pressthe power back off
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did you get your tv fixed? have same problem last night...a loud click and then blank screen and just tries to turn on, can you email at res116@comcast.net

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1 Answer

Toshiba 50HP66 plasma


It can be the power supply, and or a short on one of the boards that is causing the set to go in to protect mode.

The service tech will swap out boards to find the problem. He will leave the board installed that does the fix.

Be prepaired, these sets are rather expensive to service.

Jerry G.

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