My TV does not turn on or do anything because there is no 5 volts where it needs to be and i don't know which componet is the 5 volt regulator because i don't have a schematic so if you have any information or even a schematic i could download that would be a great help thank you
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Re: TV Needs new 5 volt regulator
Check for DC output at D653, if you have voltage there find Q682 and measure the voltage at the emitter. You should get 5 volts.
Just a question, if you are missing the 5 volts; do you have any other functions on the TV not working?
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I want you to know I have been where you are on this same TV and what I found is there are three ICs all in close proximity on the SIGNAL BOARD that I recommend strong you try REPLACING all caps on the ICs as follows:
IC2P02--12 volts input and 9 volts output change C1P01 on input 47 mfd/35 volts change C2P03 on output 100mfd/16 volts
IC2P01--11.9 volts on input and 9 volts output change C2P04 on input 47 mfd/50 volts change C2P05 on output 100 mfd/16 volts
IC2P03--4 volts on input pin 5 and 3.2 volts on output 1 and 3.7 volts input on pin 2 and output pin 4 is 3.2 volts. change C2P07 47 mfd/35 volts change C2P09 100 mfd/16 volts
I know this is a bit technical but it is what is wrong with your set. Caps have polarity (positive and negative connections) They all must be unsoldered and new ones soldered back
The Signal Board usually has the tuner on it where the coax connects. The board needs to be removed by unplugging it to change the caps.
TV needs screen volts adjustment, screen volt control knob is located on flyback transformer. Turn On tv and rotate screen volt (G2) control knob clockwise little bit to increase volts to get picture. This problem related with picture tube as its performance seems weak and causing problem.
Just to make you aware that this TV is 11 if not 12 years old.
With age comes issues with components such as the picture tube 'CRT' or more likely 'Capacitors' to which are drying out. These are like small little batteries that over time just don't hold their voltage charge anymore. If it's rated for 9 Volts DC it's only charging to 4 of 5 volts at first. Over some time when the TV is on it might just get up to 7 or 8 volts and start to work again.
Unless you change all or know what specific capacitors to change yourself. Might be best to invest in a new flat panel TV. Just a thought! Blessings, A/V Media Guy
Your TV will probably not work on 95 volts. It may even damage your set. To see if your TV is still working properly you need to find a source of 108 volts at the minimum. Why is your voltage so low? Are you using a meter to check it?
Sounds like the 5 volt supply is low, Look for the 5 volt regulator, Measure you can go directly to the sensor 3 pins 1 will be 0 volts one will have 5 volts the other is usually a fluctuating 3-5 volts if 1 pin has to have 5 volts if it is low check capacitors around the 5 volt regulator probably 47uf to 100uf look for rusty look on the leads. If you see it change it! check these voltages with set turned off ( standby ) do not attempt if you dont know what your doing. Good luck. The reason it works when it is on is because there is a run 5 volt supplement.
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.
this problem could be a few things. first if you know how touse a volt metter go to the crt pcb on the end of the picture tube. Try to measer the voltage on the collector of the red drive transistor. If when the red color goes away and the voltage shoots way up past 150 or so volts then the red drive is disapearing from the video jungle ic or through one of the componets from it. If the voltage drops way low like less then 65 to 75 volts or less then theres a cold solder connection between the b+ feed resistor that suppys the b+ to the drive transistor the driver power supply sourse.. In an extremely rare case would the Picture tube be at fault but certainly could be. Good Luck OOps almost forgot it could als be a bad connection on the crt socket as well..