Most chips are as follows pin 1 input voltage pin 2 common gnd pin 3 volts out ie 5vdc connect vom meter to it as follows black lead to middle pin red to pin in right if you can read the print on the chip set vom to vols dc and check it
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Re: how to test 5v ic regulator(3 pins)
Francis, 3 pin voltage regulators have the following;
1 pin is INPUT, let`s say 12 volts
1 pin is OUTPUT, let`s say 5 volts
1 pin is GROUND, all electronics equip. has to have a ground
the problem is they are not all wired internally the same so how do you tell which is input pin and which is output pin ? the best way to find this info is find the data sheet on-line. Google the letters NTE and click on their cross reference link and then enter the number on the front of your regulator and it will cross your device to NTE`s device and show you the info, hope this helps you, Happy Holidays BMW Rider
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1= this happen because th IVR fail, see the diagram and test it use the DVOM OR VOM for test the IC .l 2= test the thermistor or sensor for defective. 3= if the voltage of IVR is out of regulation in this case +12vdc,test for ground.if is o.k test by the side of battery side of the IVR, if this voltage is present replace the IVR, if regulated voltage is withing specifications, test the printed circuite from the IVR to the gaues, and if there are open circuite replace the circuit board. OF course test the fuse too. God bless you
Hi the problem you are having is going to be with the convergance ic they will need replacing this is a common problem with this type of tv and tv repair shops are familiar with this type of repair but getting this done will solve your problem and should last a good 2 to 4 years after repair has been done
maybe its on power supply try to check at power supply section check nearby parts of regulator ic if you can, test those passive and active parts using vom if those parts are ok then the regulator ic is defective
The easiest way to do this is to use a 3 pin regulator IC. For a 5 volt supply go to this WEB site, http://schematicwiring.com/simple-electronic-applications/5v-dc-regulator-with-3-pin-regulator-circuit-schematic-diagram/ For a variable voltage power supply go to this WEB site. http://www.engineeringslash.com/power-supply/three-terminal-adjustable-regulator.html
Check the volatage regulator in the mainboard resolder all you found dried unsolder parts inside mainboard. Voltage test the regulator IC if have a voltage flow 2.5 to 5v DC. check ribbon cable connector from mainboard to controller board if properly connected. In the controller board find the small fuse test it for open. Reminder:
When you voltage test in the power board
in the primary section of power supply
use hot ground. Do not use the hot ground
when you voltage testing the secondary
power supply, mainboard and controller
because it will cause of damage
semiconductor. For safety use cold ground
for secondary, mainboard and controller
The amps are 8-pin CHN 4558CN [K1D142]
and 8-pin PHIL TDA8199 [LD8136]
The Voltage Regulator is a 14-pin LM324N
There is a 3-pin LM7812CN 12-volt regulator...
They are in the sub-woofer housing which is held in place by tape so it can be pried off if done with care.
Hope this helps.
If you have all the cables and wires in place I would appreciate knowing the connection sequences (someone cut all the wiring to the set I have.)
The problem is IC 451, (Yamaha Part # XU814A00) (Number on part PQ05RD11 Made by Sharp). It's a + 5V 1A Voltage Regulator. It's located at the bottom of the power supply board mounted to the front heat sink. It's a four legged TO220 Package outline. So don't try to slip a three legged 5 volt regulator in it's place. This can cause serious damage and headaches. Change this part and everything should be good.
Check for 5 volts present at pins of EEPROM IC. ( 8 pin-center
front) = no 5 volts = Re-check power supply components such as AC in resistor 2.7 Ohm ?....Or 5 volts ok,then suspect EEPROM corrupted........part # 223957 ( install 8-pin socket,then re-plug in original, if that doesn't clear it, plug in
new part) Use pre-programmed after-market replacement,if you
can get it.....Let me know....T.