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Toshiba 55H70 55" Rear Projection Television - Page 6 Questions & Answers
Duraing a power outage my tv went off and now will
Is your TV's indicator light ON? Did you try turning it on from the remote as well as from the TV's control panel?
If your TV's indicator light doesn't come ON, it could be that the fuse inside has blown due to the power fluctuations. If indicator is ON, your TV's internal power supply seems to be fine, you may have to take it to your technician.
Looking for resistor value on Toshiba PB7243 Power
R7711, R7721,
R7116, R7726, R7736, and R7731. are MF, 1.2 ohm, 2W resistors--MF means metal film or metal oxide--check all of them if you are replacing the two STK-392-110 CHIPS---
They are protect resistors in case some part of either chip shorts--if even one is bad--you need to replace both chips at the same time and adjust.
If you need help or advice let me know--I am here to help.
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SD TECH
It won't turn on. The red light blinks and a click
STK392-110 IC's. This problem is mentioned all over the place here.
Quick test: Remove the back cover. At the center of the closest side of
the circuit board are 3 identical plugs. The circuit board will be
labeled "Red, Green, Blue" and the plugs will have some matching
indicator. Mine are colored-marker stripes.
Unplug all three. Turn on the set. If it continues to run but the
picture is a mess -- it's the ICs. Use STK392-110T or STK392-118.
Replacing these takes a fair amount of skill with a soldering iron and familiarity with TV service. Or a death wish.
Convergence problem
We need a better description of what you mean by shadowing. However I am assuming:
1. You mean it ''bleeds'' off to the right when you have something with a hard red/blue drive.
2. When you turn the contrast and color down a bit it gets better.
unfortunatly I cannot tell you how to fix convergence, but I can think of some other possibilities.
In this case the red/blue emmision of the crt is dying off and going into saturation when driven hard. To fix, replace with a new picture tube/crt. In some cases you can get a little more life out of that tube (with a watchable picture) by having the screen, focus, cathode bias, and drives slightly readjusted. It will take someone with experience in doing these adjustments on a weak tube to get it looking as good as possible.
Given the construction of the cathodes (guns) in that crt, only a very low level crt reactivate should be tried on it. The hard rejuv most crt testers give is highly likley to completely destroy the cathode on that crt.
Toshiba 558 x 70 no picture
Try unpluging the set for about fifteen minutes or so. If that doesn't work more then it is your power supply board.
I have a Toshiba 55H70 that started with
this is a very old set and the problem you descrbe , sounds like the ics are not getting their -32 and +32 volts and this could be a fuse i do not have a diagram on habd due to age and I checked toshiba website and they no longer support this set i can tell you that
the fuse im talking about has a label of FA something it looks like a rectalngle cap take a look arounf the deflection board that is the one with the flyback on it
Double image
If you go into the customer menu and Select convergence and blue is skewed and will not adjust you have a convergence circuit problem.
Most of these Toshiba sets use two of the STK-392-110 convergence IC chips. Both chips along with any of the 1.8 ohm protect resistors around them that are bad (easy to check--like checking a fuse) need to be replaced and the set adjusted via remote control.
If you can do this yourself you can save a lot of money as most shops are going to charge 300 or more for this type of repair. You can buy a pair of the chips on Ebay for under 15 dollars plus shipping. Total parts cost for the repair should be under 30 dollars.
Both chips have 18 pins and are soldered in. The hard part of this repair is getting at them. If you think you or someone you know can solder and get at them I will be happy to give you general directions and answer any questions you have.
If you get a tech---some are going to say it has to go to the shop---keep looking as any good tech can do this in your home in about 1 hour----I know as I have done hundreds of them here.
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SD TECH
Power shuts off and on
this set has a power supply problem and has to be serviced call a reputable tv shop and get an estimate..
The convergence is off
Try to adjust it, if still does not work. Call a TV tech will need to Replace the amplifiers.
Good luck
N Sabre
Looks like 3D - the red won't converge and is distorted
55H70 model uses two of the STK-392-110 CONVERGENCE IC CHIPS.
If red is skewed and will not adjust you need to replace both chips and any of the protect resistors around them that are gone---Most of the time just the two chips need to be replaced.
You can buy a pair of the chips on Ebay for less than 12 dollars plus shipping----
The chips are black in color--2 1/2 wide X 1 1/2 tall with 18 pins each and are mounted on large metal heat sinks side by side----THEY WILL HAVE THE STK-392-110 PRINTED ON THE FRONT OF THEM IN WHITE.
The question is are you able to do this yourself? If you can you can save the set and a lot of money--most shops are going to charge 300 or more for this kind of repair---IT SHOULD BE FIXABLE IN YOUR HOME.
I HAVE repaired hundreds of these sets--just got back home from doing a Panasonic that uses the exact same parts your set uses.
The chips fail because a white grease to quickly transfer heat from them to the heat sinks dries out after time and one of the chips goes.
Let me know if you need more directions--the hard part of this repair is getting at the chips and the ability to unsolder and replace them.
TOTAL PARTS COST SHOULD BE UNDER 25 DOLLARS.
If this information has helped you, rate this solution as I do this here for free.
SD TECH
Watching tv and it just quit working. power
Typical behavior for a failed main power supply.
These are probably not built or repaired by Toshiba since this kind of subassembly is normally bought from other specialized manufacturers.
My suggested 'fix' is pasted below-
If it's failing to turn on, the main power supply is probably at
fault and without some technical background and a couple of test instruments,
you will not be able to do the repair yourself.
What you can do though is; unplug the set, let it
stand overnight or at least several hours, remove the back panel and look for a
separate board with mostly larger components on it; it will have a ferrite core
(no laminations as with a line-frequency part) transformer on it and several
larger capacitors which are cylindrical and mounted vertically to the board.
Before touching anything inside, especially on
that board, allow several hours to be safe since the larger capacitors can hold
a painful voltage charge for some hours.
If you see signs of overheating such as
discoloration of the board material, the PSU may not be repairable but if you
can find a part number on the board, you might be able to buy the power supply
from the mfr. and install it yourself but it will likely have the same problem
eventually unless they have altered the design or improved component quality.
If there are no signs of heat damage to the board,
there may be companies offering to repair it as a subassembly instead of
repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the main
power supply still may not be at fault since most are capable
of switching on and off if a downstream problem is causing an overload.
I have lines on pictur the re on the right side
you are having a convergence problem
you will need to change a couple ics and possibly some resistors there to correct the problem
if you have the tools and knowledge and can solder its not to bad to do
if not you may want to search for some local help from a service company
depending on area cost should be 280 to 320 for that repair
I have a 55" Toshiba
As your instincts have told you this MR.Techie is trying to rip you off. I think what you have is a faulty ballast. A ballast is a part in the projection tv that supplies power to the lamp. If the lamp is drawing more power than normal, then the ballast turns off and resets itself after a while. That's why the set works for a while before turning itself off again. A faulty ballast may reset even though the the lamp assembly is drawing normal power. You may also need to replace the lamp if it doesn't resolve the issue.It is a relatively inexpensive part but you will need the techie's assistance to replace it. Should cost you around 100-150$ for the repair.
Feel free to post back if you need more info.
Sai.
My tv turns on and I can see the picture just fine
COULD BE, THE BEST WAY TO TEST IS, IF THERE IS A PROVISION FOR HEADPHONES THEN PLUG IT, IF YOU CAN HEAR SOUND, THEN ITS YOUR SPEAKERS, IF NO SOUND IN THIS APPLIED STEP.. COULD BE THE AUDIO OUTPUTS, OR FUSABLE RESITORS BLOWN, OR DRY JOITS ON YOUR AUDIO IC..CHECK OUT
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