Question about Hitachi 50UX58B 50" Rear Projection Television

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50ux58b plug it in green leds power up & then go out

When I plug the set in a series of green LEDs on main board power up then go out.

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Had it repaired by service tech. was in the high voltage circuit. small part , & about 20 minutes time & he had me up & running for 240 bones. I'm sure it was a 50 cent part, oh well, it's a great picture.

Posted on Nov 07, 2008

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Working on a 60UX54B with identical problem (also has the same power supply as yours) which failed from power surge.

Can hear a quiet squealing sound when plugged in for about 2-3 seconds illuminating 6 of the 8 green power monitoring LEDs, actually powering up high voltage and audio and then shuts down. No other activity or response from power button or remote. +5VDC and +9VDC LEDs remain dark as no powerup command is sent by TV CPU which is normal. +12V standby LED does illuminate and then turns off with rest of LEDs. Is this +12V standby LED supposed to remain on at all times?

Red 'protect' LED illuminates dimly during this brief power-up time, gets bright and then intermittently flashes (very dimly) of all things after shutdown. There is no flash diagnostic feature for this LED. Vcc (pin 5) of PWM controller (I901) on PCB fluctuates between 14-21 VDC in sync with flashing of red "protect" LED.

No shorts or excessive loads in other parts of TV because no difference when power PCB is disconnected from the audio/tuner PCB. Still powers up for 2-3 seconds when plugged in and then off. LED's stay on much longer as there is no loads on power supply other than the LED's themselves.

All IC protectors test good.

So now I suspect STR-6811A (I901) PWM controller is at fault and it would indeed be damaged by a power surge. This is the 7 pin IC on the large heatsink near the switching power supply transformer where AC cord connects.

Ordered a replacement STR-6811A on ebay ($12.00 with shipping) and will update here if it solved my problem.

Posted on Nov 04, 2008

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Bad power supply

Posted on Sep 27, 2008

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1 Answer

WONT TURN ON


Older but good set---two things here to begin with

1. It has a line cord fuse in the set(if power light comes on at all that is good).

2. with back removed at plug in of power the set has several green Led's on the board---the red one should be on when set is plugged in.

3. The green ones at plug in should all be lit--each is connected to a different voltage line coming out of the power supply.
4. At plug in all should light and watch when set turned on if one or more go out and if all go out which was last or first to do so.

This was their way of pinpointing where the problem is.

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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.
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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,

Jan 12, 2012 | Hitachi 50UX58B 50" Rear Projection...

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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,

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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,

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1 Answer

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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,

Aug 21, 2008 | Hitachi 50UX58B 50" Rear Projection...

2 Answers

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hello. it sound like a power supply problem to me .!!! it could be a bad solder joint.!!! or a bad fly back transformer.? "good luck"

Jul 27, 2008 | Hitachi 50UX58B 50" Rear Projection...

1 Answer

No picture or sound


Remove the rear panel. With the TV on you should see a red LED near the center of the PCB. There should also be 5 green leds, 3 to the left a 2 behind. If there is no red leds, check the fuses. If there are no green leds or maybe 1 or 2, disconect PSD5. It's a connector on the left side of the power board that connects to the audio board. It's the 3rd on fro the back. It's labled. With that disconected, turn on the set and look for the green leds. If all 5 light, the power supply is OK and you have a problem beyond that. If they don't all light you have a bad power supply.

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I have seen that symptom many times. Most likely, the little blue capacitor next to the horizontal output transistor has shorted and popped the main B+ fuse. This is very common in those Hitachi projection sets. These parts should be replaced by a tech familiar with Hitachi projection sets.

Aug 14, 2007 | Hitachi 50UX58B 50" Rear Projection...

2 Answers

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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,

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HELLO I WOULD REPLACE THE HOLE BOARD.!!! AND GO FROM THERE. HOPE THIS HELP'S YOU.!!! "GOOD LUCK"

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