20 Most Recent Toshiba 55H70 55" Rear Projection Television - Page 9 Questions & Answers

HOW TO CLEAN TV SCREEN;

Much like anything in your home, TV screens get dirty with fingerprints and dust and require a periodic cleaning. Keeping your TV screen clean is essential for ensuring a clear picture. However, cleaning the front of your TV is not something that should be left for the cleaning lady. The use of certain cleaning products and solvents can damage the front of your TV screen. Special care must be taken in order to make sure that your TV screen is cleaned properly.
Every kind of TV has different steps for proper cleaning. If you are unsure what kind of TV you own, consult your TV user's manual to ensure that you are using the right cleaning method.

• Direct-View - Older direct view TV's can be cleaned with glass cleaner and a paper towel. Newer tubes that may contain any special coatings, like an anti-glare coating, should be cleaned with a damp cotton cloth. If you are unsure if you have any special coatings, it is best to be safe and use the damp cloth.
  
• CRT Rear-Projection - Before you can begin cleaning, you need to determine if you do, or do not have a screen shield. A screen shield is a hard plastic cover over the front of the TV screen. If you can't tell, give the front of the TV a light tap. Another way to tell is to check for ridges in the screen area. If you can feel ridges on the screen, then you do not have a screen shield. Rear projection TVs without a screen shield require a special kind of cleaner and rag. These are available for purchase at your local TV service center. Those that do have a screen shield should be cleaned with a dry or damp soft cloth. If it's extremely dirty, a mild soap may be used. Do not use paper products, such as paper towels, to clean the screen shield. Paper products can easily scratch the surface of the shield. Screen shields can have a tendency to streak while cleaning. If this happens, use a dry cloth and buff the screen in a small circular motions.
  
• Microdisplay Rear-Projection - All microdisplay TVs have some sort of screen shield on the front. These TVs should be cleaned with a damp cloth. Microdisplays with a shiny screen shield can be cleaned with a mild soap if extremely dirty. Those with a flat screen shield should not be cleaned with any cleaning agents. Do not use paper products to clean the front of the TV because they could scratch the screen surface.
  
• Plasma - Plasma owners should clean the front of the TV with a soft, damp cloth. The use of a mild soap for heavy cleaning is acceptable. The use of heavy cleaning agents could strip the special coatings on the screen, and paper products can scratch the front of the TV.
  
  
• LCD Flat Panel - Be careful with flat panel LCD TVs! Use a slightly damp soft cloth to clean the LCD screen, then immediately dry with a soft cloth. Do not press ******* the screen during cleaning. Doing so could cause severe damage to the display. Do not use any cleaning solvents, such as glass cleaner or soaps, to clean the LCD screen. Paper products could scratch the front of the screen. If you have a pet or child that rubbed something on the screen that you feel could stain or damage it, contact your local TV service center for assistance.

When dusting the TV cabinets, dust with a damp cloth or a mild cleaner. Paper products can scratch the surface of high-gloss cabinets, so avoid paper products. Heavy cleaners can strip the finish off of TV cabinets over time. When cleaning speaker grilles, dust with a dry cloth. Wet cleaners could stain or damage the grille cloth.

Hope this may help;

DON'T FORGET TO RATE:

Try un-pluging the set for about 3 minutes then back in then on- (Hard Reset) Let me know?

http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000001850.pdf

You need Adobe Reader to read, but just load and click save = )

Pull off the two speaker grills. They will seem like they are going to break but they'll snap out. You'll then see the 8 screws that hold the plastic lower facing in place. (4 on each side) Once you remove the facing, you can see the 4-6 screws that attach the screen assembly at the bottom of the screen. Once you've removed them, you simply place a hand along the left anf right edge of the screen assembly and pull up. This will pull the screen assembly off the plastice hooks inside the cabinet that hold the screen assy. in place. You can now clean the mirror and lens assys. You can use windex on the mirror but many projection TVs have plastic lenses so use a prepared solution from a video store or make your own with luke warm water and a couple drops of dish washing liquid. Don't get the lens too wet, so that water drips onto other parts of the TV.

michtech

This is a problem within the convergence circuit. If you can solder you should be able to repair this yourself. Let me know if you wish to attempt the repair and I'll provide additional details and instructions.

Dan

NEED NEW SCREEN FOR MY TOSHIBA 55PJ6DB CAN YOU HELP

if he fied the tv and it cost that much he ripped you off...you can buy a brand new tv for 700.00 at walmart he overcharged you by about 500.00

You need to replace the two Convergence ICs. Please post the model number of your set and I will post the IC numbers you need and post a link where you can order replacements and get free instalation instructions with pictures so you can do the reppair yourself.

its the problem of convergence ic on the main board just will have to rep[lace that ic on the main board.number is 392 and there r 2 such ic just get it replaced,

Is there an advanced convergence setup anywhere in the menu where the screen displays a grid? If so, you might want to get into that and move along the grid to each section that looks off. Adjust until the color falls behind the gridline, and move on to the next. It can be a time-consuming process, but should take care of your convergence issues.

You need two STK392-110 ICs and the six feed resistors. You can get the complete kit at the following link which includes both Ics and the resistors along with step by step instructions on how to do the repair. The Kit you need is the Panasonic convergence repair kit type1. Heres the link.
http://servicemanuals.vstore.ca/

it sounds like a convergence problem and there are different settings for 720 and 1080 in the service registers

I think you need a remote to use the convergence features of this set. Does it have an auto convergence feature? And does it work?

Today, I started researching the exact same problem on the same model TV. From what I've learned, it seems this model TV (and many others with this part) suffers from a part that runs hot and is not very reliable. The part so frequently goes bad, that one person on the forums bought the parts for "when" not if it goes bad. So, you are far from alone.

The failing part apparently responsible for the color convergence problem you are experiencing is the STK392-110. There are two of them in your TV and together they control the color convergence of the 55H70. Basically, these 2 ICs need to be replaced with the newer and more reliable replacements, the STK394-160 (alternatively, you can also use the STK392-150 or STK329-180, but the STK394-160 is the latest and greatest equivalent for the original part). It is best not to replace the STK392-110 with another STK392-110 (which is what many repair shops will do).

To perform the replacment, you have 2 choices:

1. Hire out a repair at $400-$700. However, often TV breaks again with same problem in less than 6 months because many TV repairman replace only the bad ICs but not the "feeder" parts (i.e. resistors) so these bad feeder parts fry the new ICs also in one week to 3 months. If you hire it repaired, make sure the repairmen has checked the resistors around the IC to ensure they are within tolerance. Also, the repairmen should use thermal compound to reseat the ICs back to the heatsinks. Otherwise the repair won't last.

2. Fix it yourself for under $60. The process can be tricky, but if you are slightly technically inclined and know how to use a soldering iron, you can fix it yourself with less risk of it breaking shortly after.

IMO, option #1 doesn't make sense for a TV that is over 4 years old. That's just too much good money after bad. If option #2 is not feasible, personally, I'd rather put the $400 to $700 or more toward a newer model.

However, if the thought of holding a soldering iron doesn't intimidate you, then option #2 can make a great TV _better_ than new. So, assuming you choose to fix it yourself, this is what you'll need to do (AFAIK). First of all, make sure you only get Sanyo original parts (lots of Chinese knock-offs that don't last). The original STK394-160 is best purchased from a reputable Hitachi licensed dealer (Hitachi apparently makes the 55H70 and Toshiba puts in name on it). B&D, acme-sales, vance, tritronics are all good choices to buy reliable, Sanyo parts from. The STK394-160 is newer and harder to find. Best way to obtain this part if via the Hitachi kit part number X480293. I just purchased the part number X480293 , which I just purchased from Tritronics for $37 + $9 shipping at:

http://www.tritronicsinc.com/storefrontB2CWEB/itemdetail.do?action=prepare_detail&itm_id=567178&itm_index=0

This repair kit includes 2 STK394-160 ICs. Both will need to be replaced (even if only one is bad). This kit includes both ICs, plus some extra resistors. While the ICs are used in many TVs, the resistors have Ohm values that are specific to each TV. So, the resistors in the kit will likely be of no use to you on the 55H70. Still, it is a good idea to test all the resistors in your TV (R7711, R7721,
R7116, R7726, R7736, and R7731. are MF, 1.2 ohm, 2W resistors according to service manual) with a meter and make sure they are still reading the manufacturer values they are suppose to. If their resistance has changed from original specs, they will likely destroy the new ICs. Look for bad solder joints and resistors that test bad or look fried and replace and resolder. Pull the old STK392-110 ICs and replace with the new STK394-160 ICs. Be very careful while inspecting those solder joints and resistors because missing even one minor problem can prevent success. Also, remember to use the thermal compound to reseat the ICs against the heatsinks.

If this doesn't work and you have checked all the resistors and solder joints, the convergence yoke may also have problems. But cross that bridge when/if you come to it.

Some useful links with more instruction and pictures on how to do this replacement:

http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://www.fixya.com/support/t287302-put_stk392_110_part_in_tv_fix_double
http://www.hometheatershack.com/forums/service-support/5600-crt-based-rptv-convergence-repairs-5.html
http://www.fixya.com/support/t284130-green_pillow_after_conv_ics_replaced
http://www.fixya.com/support/t116226-convergence_ic_stk392_110_vs_stk392_110t

Note: I'm no expert and basically in the same boat as you. Just sharing what I've learned. So, any experts, please let me know if I missed or incorrectly stated anything.

Dean

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

the convergence ic's are faulty.

Your question is not appropriate for this website. Sorry.

what are the colored circles youre talking about?

If the red isnt responding via the remote you will need to replace the STK392-110 Ics as the service menu adjustment will not correct it 100% due to the IC being faulty and the red and half the green is controlled by one IC and the blue and other half of green is controlled by the second IC so without changing both ICs the set will progressively get worse. Both ICs are stk392-110. You can get replacements at the following link along with instalation instructions
http://servicemanuals.vstore.ca/