Question about Hitachi 50UX58B 50" Rear Projection Television

3 Answers

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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Posted on Jan 02, 2017

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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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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,

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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

42PF5321D/37


Measure the connector from the logic board to the power supply the second pin from the left it will say Vs_ On if the set has 3.1 volts the problem is the SSB or the logic board. On the logic board there should be a solid led and a flashing led that shown that data id flowing and the problem is the SSB. The SSB is easy to replace just remember what you tokk loose and from where. You probely will save money that way. If the set is in warranty or just out of warranty contact Philips 1-888-744-5477 and see what they can do first.

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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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