Question about Toshiba 43H70 43" Rear Projection Television

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Need info when testing a resistor how do you know if it`s open or short what do i put my tester too?

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I made a couple videos about reading and testing resistors. Keep in mind, if you're reading a resistor while it's still in the circuit, it might not read the value that it says on the resistor because of the circuit it's in. While in circuit it can only read the value of the resistor or less. If it reads more ohms while in circuit, then the resistor is probably open. My meter reads OUCH when it's open and 0 when it's shorted.

Posted on Jan 27, 2016

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You set your tester to Ohms and if it is open the reading will not change, if it is shorted (not likely) the reading will go to zero, and finally if it is fine then the reading will correspond with the resistor value.

Remember not to hold both of the leads as you do these tests as you are a giant resistor and will change the readings.

Posted on Feb 26, 2009

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Convergence Resistors keep burning up


Some simple advice---if resistors are smoking one of the chips is shorted----The set has two voltages that go to them--one a positive voltage and one a negative voltage.

If either chip is shorted you can replace the resistors all year and not get anything. The resistors are protection in case one or both chips short----

Remove all old heat grease and install two new chips and replace the resistors at the same time.

Note that the set may have pico fuses on the power board also.

Jun 09, 2012 | Sony Projection Televisions

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KDF60XF955 LCD Projection TV


No you didn't but sometimes when lamp goes out there is a fuse also goes with it. If the new worked for a short time or never worked then I woul look for an open fuse. I would need schematic to find. Are you can keep asking here until someone give more helpful info.

Jan 04, 2008 | Projection Televisions

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Burnt smell blush picture


Maybe High Voltage Transformer, you can have a board replaced easier than buying a new set.

Dec 22, 2007 | Samsung PCN5425R 54" Rear Projection...

1 Answer

Pt-53tw53g hasflashing light flashes 3 times


Short protection and a 98 percent chance one or more of the 2.2 ohm resistors that protect the two STK-392-110 convergence chips are open.

I will enclose a photo of the chips and directly in front of them are a number of light powder blue resistors----look over the group for ones actually marked 2.2----look to see if any are discolored (somewhat in the middle). A meter can be used to test them instantly---the ones with values marked that are not 2.2 never fail.

If this is found it explains the three blinks---resistor opens and set detects no voltage to one of the two chips and shuts down.

Both chips and any open resistors (usually only one) need to be replaced.

I have my own start to finish instructions with more info based on having done this repair in this set hundreds of times.

A email address will result in getting a copy of them for free--they tell you everything you will need and how to do the repair.

SD TECH

5_23_2012_9_01_21_pm.jpg

May 23, 2012 | Panasonic Projection Televisions

1 Answer

Timer light flashing.tv not turning on


Hi kingkhang86,

This is an indication of out-of-regulation in the power supply section. The very common caused of this fault is the leaky electrolytic capacitor in that section. It will drop the supply from normal voltage and will disable the unit. Sometimes it has a bulged/dome at the top but not all, it is better that you have a capacitor checker/tester to determine its condition. Also, bad solder joints can produce the same symptom, it is hard to spot, you should use table lamp/portable lamp for finding the cold solder. Secondary reason of fault is the open fuse/fusible resistor in series with the output of regulator IC/transistor, shorted/openRegulator IC/transistor, shorted zener diode(all are in the power supply section) and the microcontroller. Best that you check the output voltage of each regulator to determine where the fault came from and narrow the job.

If you don't have necessary tools and test instruments, and can't do the job yourself, I would advice you to look for a professional to troubleshoot the problem. Don't attempt to work in the power supply if you don't know the safety precaution of handling it, there some stored electricity enough to hurt you with a little mistake only.

Also check if your unit is under warranty /extended warranty, avail it because the manufacturer of your unit will fix it for free. Don't open the back panel, this will void the warranty.

Hope I helped you.

Have a nice day!

Thanks for using Fixya.

Feb 20, 2011 | Mitsubishi Projection Televisions

1 Answer

Red light keep blinking on tv


Hi makemoneygre,

This is an indication of out-of-regulation in the power supply section. The very common caused of this fault is the leaky electrolytic capacitor in that section. It will drop the supply from normal voltage and will disable the unit. Sometimes it has a bulged/dome at the top but not all, it is better that you have a capacitor checker/tester to determine its condition. Also, bad solder joints can produce the same symptom, it is hard to spot, you should use table lamp/portable lamp for finding the cold solder. Secondary reason of fault is the open fuse/fusible resistor in series with the output of regulator IC/transistor, shorted/open Regulator IC/transistor, shorted zener diode(all are in the power supply section) and the microcontroller. Best that you check the output voltage of each regulator to determine where the fault came from and narrow the job.

If you don't have necessary tools and test instruments, and can't do the job yourself, I would advice you to look for a professional to troubleshoot the problem. Don't attempt to work in the power supply if you don't know the safety precaution of handling it, there some stored electricity enough to hurt you with a little mistake only.


Hope I helped you.

Have a nice day!

Thanks for using Fixya.

Feb 14, 2011 | Sony KP-51WS520 51" Rear Projection...

1 Answer

Tv still turning off blinking three times after hori ic replaced


Three blinks is short protection.

97% of the time it means one or more of the 2.2 ohm blue resistors around the two convergence IC's is OPEN.

There should be 8 or 10 of them: light blue in color and will have 2.2 printed on them ------look for any that are slightly discolored or white in the middle.

What happens here is if one opens====one of the two convergence chips got it----they can be tested in place like testing a fuse===no reading across any of them and it is gone-----set detects no voltage reaching the chips(Usually STK-392-110---black in color and on metal heat sinks with fins side by side.)

DO NOT JUST REPLACE THE RESISTOR IF YOU FIND ONE BAD=ONE OF THE CHIPS GOT IT.

I have start to finish, step by step instructions showing what is needed and the best way to replace the chips etc.

FIRST: LOOK TO SEE IF any OF THE RESISTORS ARE GONE. (BAD)

If you want the instructions let me know and I will post them here for you.

Regards, SD TECH


FYI= Whoever told you to replace the output transistor does clearly not know these sets very well as it will produce a 5 blink error code.



Jul 26, 2010 | Panasonic PT-53WX53 53" Rear Projection...

2 Answers

Panasonic PT-47WX49 convergence amplifiers


check R7059 and R7050
check for 2.2 ohm.
if not 2.2ohm replace them.
values are 2.2ohm at 2 watts
also look for bad soldier around all serounding resintors.
.

Jan 15, 2009 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

I attempted a repair


Yes those resistors are open. If you remove 1 leg of each of those resistors out of circuit then test them you will find that they are open, replacing those with the same rated flameproof resistors should solve your problem. You can contact me at slinteriors@yahoo.com and I will send you some Ebooks that will give you some basic instruction on electronic repair. I have a wealth of information and I dont mind sending you whatever can help you learn electronics. Its a fascinating field.

Apr 11, 2008 | Panasonic PT-53TW53 53" Rear Projection...

1 Answer

Watts of the resistors convergence tbl


give me the board location numbers and I`ll get you the info you need, (next to the resistors it will be printed on the board, )example: R100, R265, R565 etc. Let me know BMW Rider

Dec 28, 2007 | JVC AV-48WP74 48" Rear Projection...

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