Question about Toshiba 55H70 55" Rear Projection Television

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My Hitachi 50SBX70B wont stay on

Picture is great when on but quits after 5-10 minutes. Switching outlets turns it back on for a short period then again quits?

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  • donnapearson Dec 29, 2008

    tv comes on for a few minutes and then goes blank

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I think you may have a bad flyback. i have an hitachi that did that and ha to change mine out.

Posted on Dec 28, 2008

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1 Answer

50sbx70b made sizzling noise then quit


Sizzle cound be crt arching or hv transformer. look for burn marks on transformer on deflection board. unplug set and remove crt boards from the crts and see if set will turn on. if replace arching crt. expensive. not to be attempted by amature.

Jun 27, 2009 | Hitachi 51F59 51" HDTV Projection...

1 Answer

Lines and blurry screen


hi, sounds like u need some solder joints re-worked (probably quite a few for a set that old, but your right it`s a great set), price varies by region greatly, I`m in central florida we would charge 75 for service call & 95-125.00 for labor depending on how long it takes to do the solder rework, hope this answers your question, get it fixed it`s waaay better than the new hd (ha ha ha) sets, video-tek

Jun 02, 2009 | Hitachi Projection Televisions

1 Answer

Unit cuts out after short period.


Yes it could cost as much as $450.00.Your set Needs Both of the STKs replaced. Hope you can solder or get someone who can, STKs are convergence ics they also control power too! If you have in your set STK392-110s use the 180s 110s do not hold up They will be big black ICs

Dec 24, 2008 | Hitachi 50SBX70B 50" Rear Projection...

1 Answer

Picture loss


It sounds as though you have what is referred to as a climental problem. In laymen terms, a transistor, chip or regulator is heating up and breaking down. The way a technician normally isolates this type of problem is by using a cooling agent ( freeze spray ). When the set heats up and the picture goes away, the technician sprays some of the cooling agent on a part of the board ( select a small area, about 6 inches square ) at a time and see if the picture comes back on. When you do finally get to the bad area, the picture should come back on for a short period of time until the bad part heats up again. After a period of time and by using the freeze spray, a person can isolate the exact bad part. Replace that bad part, and any filter capacitors hooked to that bad part and the set should work properly. As always, use caution and unplug the set before opening the set and when using the freeze spray, be sure not to touch any connections in the tv as they could produce shocks.
I hope this has helped and good luck on your problem.
Ed
NC Electronic
Mills, Wyoming
Have a Great Presidents Day

Feb 18, 2008 | Hitachi 57SWX20B 57" Rear Projection...

1 Answer

Need help


If the green lites on bord lites up doesnt mean it is ok. If you check on that board in the middle at the back of the heatsink in the middle, there is two lights, green lights that is not lighting up. If i am wright. You have caps an a transistor on your powersup that is shorted. Take to somebody to fix powersupply.

Jan 24, 2008 | Hitachi 50SBX70B 50" Rear Projection...

2 Answers

Dark Picture


Symptom: NO PICTURE
Cause: DEFECTIVE 3D/YC COMB FILTER
Symptom: DARK PICTURE
Cause: DEFECTIVE 3D/YC COMB FILTER
Symptom: DARK PICTURE
Cause: DEFECTIVE C724

Jan 16, 2008 | Hitachi 50SBX70B 50" Rear Projection...

1 Answer

My 50SBX70B flicks than lost the power


Symptom: NO HOR SYNC
Cause: DEFECTIVE I008
Symptom: No Horizontal Sync. When PinP is called up, main picture may lock up for a 8 moment, then it goes back out of sync.
Cause: I008 defective (Sync Switch)

Jan 15, 2008 | Hitachi 50SBX70B 50" Rear Projection...

1 Answer

I have a hitachi 50sbx70b


sounds like either a tube is arcing or h.o.t is arcing.

Nov 12, 2007 | Hitachi 50SBX70B 50" Rear Projection...

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