Question about Hitachi 50GX49B 50" Rear Projection Television

1 Answer

No Picture, Raster or Sound

PROBLEM DESCRIPTION: Believe the problem is in the power suppy. Model: Hitachi CU 5002k 50" 3 tube projection. No picture, raster or sound. In a dark room there is no lights or filiment glow. Unfortunately no burned out parts, smoke or sparks either. I have no scope. Have VTOM. Output from the Sub Power Supply is, and should be, 122 VAC (Point AD). Imput to the Power Deflection Circuit (Point AD) 122 VAC. Then goes to a Diode/Capacitor Bridge Circuit and emerges at a fuse at 76 VDC. It then goes thru two capacitors to a test point (30). At test point 30 the voltage should be 129 VDC and is 76VDC None of the diodes on heat sinks are (temperture) hot or even warm. Haven't preceeded on to the flyback transformer because it is much further down the line. SUMMARY: I suspect all the parts in the circuit. In particular the bridge rectifier and a switching transitor. I don't expect a definative answer, but would like your thinking on a solution to this problem (Am I looking in the right place?) Going to a TV repair shop with this older set (1992) is not an option and I do have limited electronic knowledge; altho this knowledge was gain on tube sets...A long time ago! Your imput would be sincerely appreciated.

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The Knight

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  • Hitachi Master
  • 76,584 Answers

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on Mar 03, 2017


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SOURCE: tv powers on but no picture or sound

luckyly here are tech that have knowledge of electronic,if you dont whant any boddie ripp you off, well this gonna help you. Definitively, your set have a short, in the power supply or in the horizontal circuit, with this in mind request to varius tech an estimate, and what, they think is the problem, then you can take a good decision...good luck

Posted on Aug 10, 2006



  • 1 Answer

SOURCE: 1998 50" Rear Projection Hitachi Model #50SBX70B--NO picture

My tv has stopped working for a week now, just turned off, have no sound or picture.
Have tried to turn off for a bit and then tried to turn back on, still the same.
there was no loud sound from tv. to think it was the bulb and the picture looked great till just went blank, and freinds say they think it's fuse. Was wondering if you you can let me know what
I can do ASAP. Thx so much.

Posted on Sep 16, 2008


Shahid Electronics

  • 10594 Answers

SOURCE: Hitachi 55FX20B 55 in. Rear Projection - no picture or sound

TV always has high voltage shock risk while repair. As you said you are not familiar with TV repair so better to handle repair person this issue.

Posted on Oct 01, 2008



  • 5138 Answers

SOURCE: REPOST: Hitachi 60SX12B Rear Projection TV typical(?) problem

If you can solder you can Fix It STK ICs they are big black ICs will have part number on them example STK392-110 replace Both and these resistors RK42 3.3ohms RK46 1.8 RK5 2.7 RK54 1.5 RK58 3.9 RK60 2.2ohms upgrade to STK392-150s better ICs

Posted on Dec 03, 2009

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atelier mj

atelier mj

  • 70 Answers

SOURCE: 52 Hitachi rear projection T.V. (model #, 53FDX01B)

look for EP98, Q655 and D756.

Posted on Apr 22, 2010

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the problem may be in the heater supply, there are 3 picture tubes in projection tv. remove the back cover, switch on the tv & observe the heaters are glowing inside picture tubes. if not unplug the tv wait for 2 minutes, & trace the picture tubes' heater wires. there may be dry solders in heater power supply.

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When the sound is working and the picture is not it indicates the main power supplies are working but the picture supply is not. The picture supply that powers the projection tubes is a high voltage generator and is very expensive to repair. Not even most tv techs now how to troubleshoot them. So, I cannot recommend you repair it yourself unless you are a trained high voltage tech.

The cost of repair - my wild guess - would be around $300. However, the real cost can only be determined by someone who can make an accurate diagnosis - which will require a hands-on approach the problem.

If you have any other problem please ask me..
Please don't forget to rate me as fixya..

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And possible areas and parts are as fallows.

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