TV Needs new 5 volt regulator

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.

Just to add to "wd4ity" very comprehensive test. If the battery voltage with the engine running is within the range quoted, Your problem is your battery. Over time the electrolyte or the plates degrade and they go to the great battery shop in the sky(just like all man made things.

Hi There,
9 out of 10 times it is loose battery terminals, corroded terminals. - Clean and tighten.

TEST:
Test your volatge regulator by attaching a voltmeter to you battery:
With bike off battery meter should read 12.50 +/- .25 volts - anything lower-battery needs charge
With Bike on at idle meter should read 12.80 +/- .25 volts - anything lower-voltage regulator bad
Rev to 2000 rpm meter should read 13.75 - 14.80 volts - anything lower-voltage regulator bad

Before replacing the voltage regualtor make sure the groung wire from the voltage regulator is tight and recheck with the meter.

Check your ignition wire screws, one may have vibrated loose. - Inspect / check for tightness
Check that wires connected to coil are tight .

Most of the time its just a loose connection. Find and tighten.

An original spec is all that is needed, all the Reg/Rect does is convert generator AC volts to DC volts for storage in the battery.

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.

Hello,
I repaired a KP53SH30 with 6-blinks error.
Sony says the error indicated loss of or short on the 5V regulator. The 5V regulator was bad, so I looked at the 6-volt regulator (it supplies 6-volts to the 5-volt regulator input.
I found a bad capacitor on the "G" board. The top was bulged. It was in the 6-volt power supply. I replaced the 6-volt regulator, the two caps on the input, two caps on the output. I also replaced the comparator chip. I don't know what part was bad, but these parts did the trick. I bought all of the parts at Mouser for about $10.00.
If you are a techno, I can send you the service manual if you need it.
I just noticed your code is 4-blinks.
Sony says it indicates +/-15 volt not supplied, and IC8003 is faulty. Hope this helps,
Dan

I have the schematic diagram if you need it.
Let me know where to send it to.

I don't know this radio individually, but heres the common thing that happens:
Sounds to me like the 8 volt regulator chip has blown after overvoltage. I expect the power supply has gone too, putting 18+ volts into the radio.
Repair the power supply. (Check its 13-13.8 Volts).
Then check the regulator (7808) is putting out anything, should be middle pin ground then 13V one side and 8V the other, if nothing, its blown. Replace it if gone.
Hopefully thats all thats gone and it should work again.

1) Unplug wire harnesses = pull chassis ( requires 2 chassis bolt
removal)
2) Dis-mount Convergence / power supply board = the one with
large heatsink
3) Locate 5 volt regulators mounted to heatsink
4) Remove old solder from pins of all four regulators =
Re-solder + solder any / all bad conncts on board....
5) Replace bad 4 amp fuse hidden in power supply area...
6) Reassemble

Is a good thing the main fuse is not open,your problem is in the power supply ,as I understand you have no indication of power(no lights,No clicks)The 5 volts that power the microprocessor might be missing,this 5 volts usually come from a regulator,this regulator should have 12 volts in one side and the 5 volts in the other,the 12 volts come from the secondary of a transformer and it has its own fusible resistor,if the resistor is open is because the regulator is shorted and it need to be replaced.This is a good place to check.Be careful when checking this parts.If you are not too familiar with tv service seek the assistance of a servicer,it should not be too expensive.