53FDX20D I have the above Hitachi TV. There is no picture and sound. The red LED light is on. The repair man told it needed a regulator circuit. Is this correct? And is so, where can you purchase one...

When u turn the tv on,u hear alot of clicking?That mean the Ballast that help the projection bulb to work is dead.Change the Ballast,might as well change the bulb too.U don't know what is the condition of the projection bulb in.

The 392-150 is a higher current device then the 110---you can use either--this is normal in the hitachi sets---I usually replace both with 150's---check the led that does not light---should indicate which voltage source is bad---if it is one of the 2 voltages for the convergence ic's(one is a positive and the other a negative voltage) then the convergence Ic's may be bad---look for any discolored resistors around the ic's---one way to tell if it is a convergence ic is to de-solder both ic's and see if the set turns on(the convergence will be out the window) but if it comes on change both and do the alignments with the Hitachi remote. By the way----the led should have a location number printed on the top of the circuit board.

The TV is in shutdown. The red LED is the shutdown indicator. Check fuse E994. If its open, the TV will need the deflection P.C.B. replaced. Its probably not worth the repair costs. These sets also have had problems with the voltage regulator circuit, requiring replacement of the regulator IC at a more reasonable cost.

michtech

There is a board on the right side of the tv called the convergence bd

There are little connectors that are on the left of the board
the last one is the power to the convergence Ic's

That is the one that is closest to you. they are little black conectors with wires in them


Carefully lift it up

Then plug the tv back in and see if it fires up

If it does do not run it long

just enogh to see the tubes light
then shut if off

If it goes on

your convergence ic's are Shorted

They have a kit for this tv it is available through local parts distributors
If you can't find it locally just Google HITACHI CONVERGENCE KIT

If you are not good with de-soldering and soldering do not attempt this repair. Remember to replace all the resistors in the kit

If you are not sure about doing this repair you should have your local tv guy do it for you


If it does not go on then I would suspect the regulator in the power supply But
Most of the time it's the ics

Hello repko,

This looks like a problem related to your High Voltage Protection circuit. This circuit shuts the TV down when it senses a high current condition (a short in a vital circuit). It may not involve extensive repairs, but it will involve some repair work. I can give you a better diagnosis if you do a few things for me.

1) unplug the TV and take the lower rear panel off
2) look at the back of the panel or in the TV for a chart showing you the diagnostic LEDs
3) Look at see if LED D912 is red or not (this may differ in your model, if so write down the numbers of all the diagnostic LEDs and there condition on or off red or green.
4)post these in a reply to this topic.

Once this is done I'll be able to give you some idea of how extensive this may be.

Thank you,

I hope this helps,

Shuttle83

Good Day, Gil;
Your problem is in deflection circuit (115+v) check these: FP05, DP15, Q777, QH01, TH01, T701, etc. BUT suspect C707 1k pfd, 2kv, and check all the pico fuses (brown) 2" to the right of cap. Good Luck, big IRISH.

Picture int disappears leaving snow on screen
Resolder the Xtal in the tuner
No picture
Replace IC (TDA8385J)
Sound but no picture
Check the LOT cable for short circuit

Either the main smoothing capacitor or the voltage regulator are faulty. You may find that the power LED will stay on after pulsating for several minutes, at which time you can switch the TV on.

Most likely have a regulator problem. Remove rear cover, look down on the main chassis, turn tv on watch the board to have some colored led's lit, usually a red one and couple of green. If the red is out, its your regulator, if a green one other problems off the circuit with green led are causing the tv not to power up.

If you have Hitachi model number 50UX58B, 60UX58B, 50UX58K, 60UX58K, 50SBX78B or 60SBX78B and you have the following symptoms you may want to grab a repair kit from www.TvRepairKits.com. They have put together a kit that includes the parts and instructions to fix these models. This is a fairly common problem with the above model numbers. It is typically caused by a blown capacitor and pico fuse. Again, you can get a kit from the above address. 
Here are the symptoms...

Primary Symptom: No Audio or Video. Power light will come on briefly then shut off.
Other Possible Symptoms : The green LEDs on the circuit board light up for a few seconds then turn off.

Hope this helps,