Question about Hitachi 50GX49B 50" Rear Projection Television

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50ux22ba no power open back all green light come on and then go off. red led says on. none the diodes or resistors look burnt,fuses okay. thank you john

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Re: 50ux22ba

Common failure is C702 Capacitor near flyback== 102K/2KV shorted==replace w/102K/3KV generic or Sony part number 1-161-754-00.Also,check E994 open 2 amp pico fuse.

Posted on Oct 09, 2007

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Will not power up has constant on off flicker , when I turn it on the green light clicks off and turns red and the cycle repeats. I have checked the fuses and also resolderd the power board. is there any...

Hi Eric,

First of all, thank you for contacting regarding on your TV problem.

I've suspected a convergence chips failure not the power supply board issue in this kind of symptoms. To confirm it, locate the convergence board inside the set, it has a Sanyo convergence chip STK392-110 that are mounted on the large heat sink. This board has a LED (light emitting diode) that will light up once the board gone to malfunction. Turn on the unit and then check if the LED will lit after the shuts down. If yes, then I would advice you to replaced both convergence Chips and check the resistance of the resistors in line with the +25V and -20V supply of the chips.
Let me know if the LED at the convergence board does not lit to continue our diagnosis... Check also the LED at the power supply board and on the deflection board(this is where the flyback transformer is located)

Have a nice day!

Goodluck and take care!

Kind Regards,


Dec 03, 2011 | Pioneer PRO-99 TV

1 Answer

57F500A, powered light on with no sound/picture, ticking noise

Over the years of servicing these sets and others for Convergence issues, I have on several times gotten defective Convergence ICs. In your case where a Resistor is now open, (Probably a 1.5 ohm 1/2 watt), I would suspect you had gotten a hold of a defective IC. I would replace them both again. Make sure to use Heat Sink Compound between the ICs and Heat Sink.(Just a thin coating on the metal area) You can get the heat sink compound from Radio Shack. They should also have the Resistor you need.
Good luck,

Jul 23, 2009 | Hitachi 57F500 57" Rear Projection...

1 Answer

Low voltage power supply problem

Hi, I agree that the regulator IC is probably toast but you`ll need a service manual to figure the rest because none of the leds are on which means NONE of the secondary supplies are running, check the chemical fuses and I`m sure some will be open. you can go to encompass parts on the internet to order the sm, trust me you`ll fix it a lot faster, gl, video-tek

May 31, 2009 | Hitachi 55FX20B 55" Rear Projection...

1 Answer

Philips 50P8341 green light

I believe its the vertical output IC. Diodes would tend to blow fuses . I would replace the vertical output and see if that takes care of the problem.

Aug 20, 2008 | Philips 50P8341 50" Rear Projection...

1 Answer

No power

Replace Convergence IC's STK392-110 and any burnt resistors
& check fuses F851,852,853,etc.........................T

Aug 11, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Wont power on

Good day, papamotts;

Hitachi has LED’s, green ‘lights’ and a red light to determine what circuit may be the problem; after removing the back of TV, bottom only, plug TV back in and observe which LED’s come on …..BUT most important which LED’s don’t come on; locate and note number, EG; DP37 and etc.

Good luck, big IRISH. Ps let me know.

Jun 21, 2008 | Hitachi 50UX26B/27K 50" Rear Projection...

1 Answer

Tv does not have power. power cord is good and so is fuse, but no power in tv. led light on TV does not come on.

well check bridge diodes first probally more then one fuse also transitter leakey cap bad solder or open bad resistor trouble soot if you can not perform call service tech.

Feb 19, 2008 | Projection Televisions

2 Answers

Will not stay on

RED light is protect circuit = do not disable !
Look for C702 near flyback transformer - might be hidden in
glue = check it = if shorted, replace 102K / 2KV with 3KV =
Sony part # 1-161-754-00 and replace E994 pico fuse.....T.

Nov 08, 2007 | Hitachi 60UX54B/55K 60" Rear Projection...

1 Answer

Wont power on

Needs Convergence amps replaced. Also fuses around this board are out. There should be small pico-fuses open around this board(replace)

Aug 26, 2007 | Hitachi 55FX48B 55" Rear Projection...

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