Question about Toshiba 55H70 55" Rear Projection Television

Apparent problem with red projector?

TV is about 6 years old and have noticed lately that it takes a minute or two for the picture to "sharpen" after having been off awhile. Tonight turned it on and picture went out and got blinking red power light (no picture or sound). Opened back panel and removed the red connector at the very back of the board behind the STK's. After I plugged the TV back in, the picture and sound came back fine. Plugging the red connector back in (after power off/on) causes the blinking red light again. Does this sound like a problem with either of the two boards connected to the red projector or the red projector itself? Wondering on a cost estimate for parts and if it is even worth repairing. Thank you. Doug

tigernut Aug 24, 2007

Did some more troubleshooting tonight and found that the problem lies somewhere on the STK board.

I can plug the red connector into either the blue or green plug and the red turns on fine.

Possibly a problem with one of the STK's?

Would be helpful to have a schematic to look at.

1 Answer

Cary Farah

Level 3:

An expert who has achieved level 3 by getting 1000 points

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

President:

An expert whose answer got voted for 500 times.
Master
4,402 Answers

Service manual here
http://www.eserviceinfo.com/
I would not replace one stk but all....
more info here:
http://www.digitalhome.ca/forum/search.php
http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Posted on Dec 05, 2007

Add Your Answer

Upload

Upload an image from your computer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

Loading...

Include an image. It's worth a thousand words.

prev next

Related Questions:

1 Answer

TV loses picture

Sounds like your picture tube or bulb is going out. It depends on what kind of tv ( rp, lcd, plasma) it could also be a component issue.

Nov 22, 2013 | Televison & Video

1 Answer

I have a 4 year old 47" vizio lcd about 6 months ago it startied taking a long time for the picture to come on turn on get the vizio screen then black for a couple minutes then picture. couple nights

Defective LED back lights strips, or damaged EEPROM on main board. I will try a main board first, if you do nor have a TV LED strip tester.

Aug 12, 2017 | Vizio VO47L 47 in. LCD TV

1 Answer

Have a Hitachi 53sdx89BA Rear Projection TV. Turn on TV and red power light illuminates. No picture, but have sound. Check PC board in back and red led is flashing and green leds are lit. It was working...

Discharged Flyback Transformer. Removed main pc board from bottom of TV and flipped over, no apparent damaged components or blown board traces were found. Noticed a lot of flux in various areas on the board that seemed unusual (maybe TV was worked on before as I bought a showroom demo at Circuit City). Used a plastic screwdriver to remove all flux between connections on ICs, Transformers, Flyback Transformer, and various other components. Cleaned all debris, dust and crud accumulation (TV is over 10 years old and there was alot around the Flyback Transformer) from both sides of board using a lightweight paint brush.
Used a magnifying glass to check all solder joints for possible cold solders and found none. Did the same for Power Supply Board. Checked various ICs and Power Transistors for opens or shorts (in machine) and they seemed fine. Reinstalled boards, said a few Hail Mary's and fired it up.

The protector Led no longer flashed under power and lo and behold I got picture and sound!

I cleaned the lens on the projectors (again 10 years of dust accumulation) did a magic focus adjustment and it works fine!

After reading other fixes, I fully expected it to die after 10 minutes so I left it on all day and against all odds it still works.

What was the fix......Dirt buildup on and around Flyback and other components,,,,,,Flux conducting electricity between contacts on Flyback and other components.....or oxidation on connectors between Power Supply and Main Board.....I don't know.... all I know is that for the moment I saved around $ 300 - 400 in repair bills by doing it myself.

Feb 01, 2010 | Hitachi 53SDX89B 53" Rear Projection...

1 Answer

Picture getting dimmer (?)

Hi, yes it`s time to replace the lamp, and remember to turn maxxed out brightness to normal once you replace the lamp :) good luck, video-tek

Jun 29, 2009 | Sony Grand WEGA KDF-50WE655 50" Rear...

1 Answer

Flasing red light where the on light is

I have a philips pf50 9630a/37 tv may come on or it may not unplug it and take a chance then comes the 6 steady red flashes followed by 3 rapid red flashes the screen had been completely replaced by philips a year and a half ago

Mar 22, 2009 | Philips 50PF7321D 50 in. Plasma HDTV

1 Answer

Bad Clutch??

Hi

Before other checking change the spring of the clutch(2).

best regards savumihai71

Feb 14, 2009 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

Color loss on mitsubishi 73" medallion hd1080

TRake the fron grill off and the front board 6- screws on my 65inch there are three adjustment knobs one of them wil adjust the huge
one the whole screen,if not that,I have heard mold growing on and the inside of the blue bulb because it runs the coolest out of the three.

Jan 31, 2009 | Mitsubishi WD-52525 52" Rear Projection...

1 Answer

Dull almost Foggy picture.

you need to take the screws out from around the screen in the back, on edges, go to the front and take the screws out from the bottom of the screen, should be 4 or 6 in the front, pick up on the screen and lift off, only about 8 pounds, now clean the little mirror in front of the projector, and clean the dust off the projector lence, that will solve it, iv had to do this on about 50 of thease tv's

Jan 08, 2009 | Mitsubishi WD-52327 52" Rear Projection...

1 Answer

Red screen

Hi,
sounds like a picture tube problem its a problem that probably cant be fixed only by a professional

Nov 30, 2007 | Sony KP-51HW40 51" Rear Projection...

2 Answers

Won't piwer on

Tried to turn it on? Sounds like you need to replace the lamp. However, I got an additional week out of my unit. Although poorly dimmed and the red Lamp light blinked constantly for that one week, at least it gave me enough warning to seek out a replacement. But so long as you're not mistaking the Power/Standby or Timer light for the Lamp light then I would have to agree with you. http://store.l-f-l.com/prod/A-1606-034-B Includes shipping to the United States and no sales tax outside of California.

Aug 16, 2007 | Sony XL-2100U Projector Lamp for...