Question about Toshiba 65H80 65" Rear Projection Television

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I have a Toshiba 65H80 that won't turn on. The red light on the front flashes. I pulled the convergence IC's to see if they were bad and keeping the set off. No difference. I did find the F470

After replacing the F470 fuse, I tried turning the set on without the IC's and the set still won't turn on. I have pulled the IC's out of other tv's and they the tvs would come on without convergence. Does a Toshiba work the same way?

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  • John Porter Jan 22, 2013

    I checked the horizonal out put transistor and found it had a poor solder joint I resoldered it, but problem is still there. I am now waiting for a new 2sc 5579 transistor to replace it. When I checked it, my test either show it bad or I am not testing it right. I'll have the new transistor in 3 day. I'll post results.

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Posted on Jan 02, 2017

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SOURCE: TV is not powering up and red light keeps flashing

I had the same red blinking led problem on my Toshiba Theaterview tv. I resolved by:
- Unplugging the tv.
- Press several times (3 or 4 times) the tv Power button.
- Plug the tv back in and press the Power button once to turn the tv on....tv worked!!!

I've had the problem before and tried unplugging the tv for a couple of days and that had also worked, but I this recent solution seems to be faster.
Good luck!
Erick

Posted on Jul 14, 2008

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texasdan
  • 60 Answers

SOURCE: Toshiba TN55X81 Wont turn on but I hear clicking

Pull the three connectors to the yokes on the convergence board. If the set powers up, it's a good chance the STK392-110's need to be replaced. I fixed one today, and it has been running for 6 hours now.
-Dan

Posted on Sep 28, 2008

  • 2 Answers

SOURCE: Toshiba 57H81 Flashing Red Power Light, Blown Fused F850+F852

Solved by resoldering some solder joints!!!!!!!
********
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

  • Upon turning on set I got flashing red power light and nothing else.
  • Removing plug for one minute and plugging in results in:
    • Audible click, steady red power light for 2 seconds then slow flashing red light
    • Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
  • Removing power cord for several hours and plugging back in made no change
    • Audible click, steady red for about 2 seconds then slow flashing red light
  • Possible related note: Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
  • Fuses F850 and F852 found blown

Repairs Made:
  • PD0074 DEF/CON Power Board
    • There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
    • Replaced blown fuses F850 and F852.
      • I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
      • Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
      • Used a fast blow 2 Amp for F852.
  • PD0073 SIGNAL Board
    • Re-soldered Q751 + Q752 STK392-110 Convergence Amps
    • Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10
  • Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
  • Already owned Service Manual and Circuit diagrams from a different 2004 repair.
  • Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
  • Some solder. Already owned de-soldering tools, etc.
  • Visited both local authorized Toshiba factory service repair facilities. One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU! Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.

Posted on Jan 05, 2009

  • 1 Answer

SOURCE: No picture, sound and flashing red power light...

Pull off the back pressboard. At the bottom left hand corner is the power cord that attaches to the power supply board. There is a white plug that attaches directly to the power cord. With the TV power off, pull this white plug up to disconnect. Then push it back in. Then plug your TV back in and press the power button on the front of the TV. I just did this and it is working fine.

Posted on May 18, 2009

SD Tech
  • 14553 Answers

SOURCE: I have a toshiba 61h70. the tv had been shutting

You need to look with a meter at the resistors around the chips, they are usually gray in color with bands that denote value--a good guess is one or more were taken out by the chips--in these sets they will look fine---typical is 1.8 ohm (brown, gray, black bands).

At least one is open (bad--no reading across--like checking a fuse) and there will be several with identical color bands on them.

Let me know if I can help.

If this told you something you did not know, rate this solution as very helpful as I do this here for free.

SD TECH

Posted on Sep 16, 2010

Testimonial: "thank you sd tech for you input on my issue. I tested each resister and they read 1.4 ohms. but none of them were open. thanks again!"

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TV Won't turn on, Has flashing red light.


Flashes of standby light is fault indication. Count it and confirm the number of flashes occurs at one time switch ON. If you wish to get more details about these blinking codes to Toshiba sets, check this link. Pull up older posts there.

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If its a Toshiba either you did something wrong (set has 3 convergence yoke plugs that are identical but have to be plugged in correct socket) or you missed an open resistor near the chips---most of those are 1.8 to 2.7 ohms and will look perfect---I always check all of them when replacing the chips.

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FYI: WHOEVER told you 110 chips can be replaced with 120 chips is wrong.

Easy way at this point to way at this point to see if chips are the problem is to UNSOLDER AND REMOVE BOTH CHIPS. Make sure not shorted connections and power set up---set will function without the chips but look terrible.

Try Suburban Electronics for the correct chips----only safe replacement for them is the 150 chip----stk-392-110 and stk-392-120 are not interchangeable.

The blinking light indicates a short.

LET ME KNOW IF YOU HAVE QUESTIONS AS I HAVE FIXED hundreds OF THESE SETS.

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I have a 54" Toshiba TV Model # 57H81. The only thing it does when I turn it on is a small red light in the front is flashing. Please help me! Thank you so much!


If you have some garbage in the main processor you need to leave it unplug for 40 MIN, to reset it back to normal. If that don't work then you need to check for a shorted horizontal transistor, mounted on a metal heat sink near the fly back transformer, that is what turns your high voltage on.. If that is good , then the next common problem would be is a bad convergence module, and you are looking at around 400 on repairs.

Oct 14, 2010 | Toshiba 57H81 57" Rear Projection...

1 Answer

My Toshiba 65H80 has red convergence problem. It


You may have cooked your new IC's
I am working on the exact same problem with the same symptoms. Make sure the tv is unplugged for at least 5 minutes before poking around. The power cord can be unplugged from the power board and removed to keep anyone from plugging it in while you are working on it.
Check the output resistors that are beneath the heat sink on the left side of the board. There are also fusible resistors, like #7711, on that side.
Check fuse 853 on the Power board. This is the board on the left when viewed from the back of the TV. You can remove both boards in the carrier by carefully unplugging all connectors, noting their locations and routing.
To remove the high voltage wires from the splitter, mark them for position then grasp the boot and turn counter-clockwise about 10 degrees to unlock them and then pull up while holding the High voltage splitter. The small high voltage wire can be removed from the flyback transformer by pulling hard while holding the flyback.
STK392-110 can be replaced with STK392-120, STK392-180, STK394-160.
I have found most of the parts at newark.com. Also check out this site for some very good info: http://www.hometheatershack.com/forums/diy-repair-maintenance/5600-crt-based-rptv-convergence-repairs.html
btw: I am not affiliated in any way.
Make sure that while you have the boards out you look for any bad solder connections. A lot of problems arise or return because of this.
I hope this helps, I have been doing a lot of searching to get this info and hope it helps you.

Too many people want to trickle the info and pretend they are giving you gold. A few hobbyists or people that can't afford to pay $300+ for repairs are not going to hurt their business.
Be safe and share knowlege freely!

Jan 31, 2010 | Toshiba 65H80 65" Rear Projection...

1 Answer

Tv won't come on


Mine is Toshiba 55 TZ, have it since 98', shutdown and red light blinking problem, search the ned and found out, generally a Convergence IC (stk392-110) problem. bought 2 for $15 at suburban-elect.com (ebay). replaced following direction from http://www.casiasfamily.com/repairlog/tp50h15.html

Open back cover, 9 screws and wirings (pls mark), removed(soldered) a electronic board infront of convergence ic. removed IC (stk392-110) (screwed and soldered).

Replaced everything and voila...! it is now working again..
no more shutsdown and red blinking light. Saves mo $400 for a repariman. of course just be careful with static and stuff.

Feb 29, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

No picture red light blinks 7 times


in this model is commom that the convergence ic.s go bad and stop the set from turn on check for a couple of fuses that are in convergence board if is blow replace convergence ic

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1 Answer

Toshiba 42H81 problem set won't turn on


This repair is for technical skilled only.....
1) Pull chassis
2)Replace open fuse(s)
3)Replace Convergence IC"s
4)Solder specific bad connects
5)Reassemble,test

Please read my previous posts concerning convergence repairs.
Or provide Make,model,age and symptom.............T.

Jan 03, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Red convergence will only move up or down


Stk392-110 red convergence IC is bad...normal procedure===

1) pull chassis   2) replace both Stk's for reliable repair

3)re-assemble  4) re-align convergence

 

If you hire a technician, 400.00 is ave. price.

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