Question about Hitachi 50SBX78B 50" Rear Projection Television

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I have 50sbx78b set dead e994 blown. check Q777 horz output. remove q777 lift one end d724 to prevent shutdown all light come on but no heater voltage.

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The required blown parts are to be replaced and checked first.also check out the fuses are they near to end or got any burn marks on them. the parts are available at www,radioshack.com or at www.shopjimmy.com
thanks.please do rate.keep updated.

Posted on Jul 15, 2009

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1 Answer

Tv will not come on


Power Supply Board.. most likely circuit Q777.

http://www.tvrepairkits.com or partsstore.com

Q777 is a PANASONIC C5413. bout 20 bucks.

Mar 15, 2009 | Hitachi 53UWX10B 53" Rear Projection...

10 Answers

TV lost power - Protect LED D912 blinking


If E994 has continuity , then C701 is ok. defective C701 gives problem with colors and picture.

If there is no led flashing, and does not turn on at all then is the power unit, test the capacitors on the power board.

Sep 27, 2008 | Hitachi 50SBX70B 50" Rear Projection...

1 Answer

43uwx10b /dp14g -found q777 shorted ,open fp05, open rp24. replaced all. q777 short again. replaced w/ ip01. q701 shorted. replaced w/t701 .q701get hot then short. what next? ...


Please check the voltage on the board and the heat sink is connected to it are correct there must short in the board ,please point by point.........










good luck..............

Jun 11, 2008 | Hitachi Televison & Video

1 Answer

Please help need to watch tv


Well this gives you someplace to start!
Symptom: NO POWER
Cause: DEFECTIVE I912
Symptom: SHUTDOWN
Cause: Q777,I901
Symptom: SHUTDOWN
Cause: E994,D724
Symptom: SHUTDOWN
Cause: DEFECTIVE I401
Symptom: SHUTDOWN
Cause: DEFECTIVE I601
Symptom: SHUTDOWN
Cause: DEFECTIVE C715
Symptom: SHUTDOWN/OPEN E995,E996
Cause: DEFECTIVE T702

Jan 29, 2008 | Hitachi 50SBX70B 50" Rear Projection...

2 Answers

No power


You need to check E991, E994, Q777, for more info ctechnicians.com

Jan 09, 2008 | Hitachi 50SBX78B 50" Rear Projection...

2 Answers

Projection T.V. will not operate?


it sounds like it is a mechanical problem (i think the ray tube broke)

it looks like the tv needs to be professionally repaired or replaced

ssry

Dec 17, 2007 | Televison & Video

3 Answers

My 50SBX70B doesn't start


There are many reasons for a no start on your 50SBX70. I will give you the most common problem I have found. Check E994( 4a pico fuse on the 120v line in pwr supply) If it is bad, remove C701(.001/2kv) from the circuit located near Q777. Inspect the capacitor for any burn marks, if so put in a new fuse and leave the cap out and fire up the set.

Nov 07, 2007 | Hitachi 50SBX70B 50" Rear Projection...

1 Answer

Hitachi TV will not turn on.


If have already unplugged and waited for atleast 15min. and still no success. Then only if you are Electronicly inclined. Check to see if you get dead completely or you get an indicator light momentarly. Which these are two different symptoms. first dead no indicator. check R931,E994,Q777. Then if indicator light comes on and goes off, check E994 which is fuse opening, C707-1000pf 2kv cap, also check D915, I601, IK04, and 05

Aug 15, 2007 | Hitachi 55FX48B 55" Rear Projection...

1 Answer

Will not power on......what could be the problem on the board?...i am good at soldering things...will replace if I new what to replace


If have already unplugged and waited for atleast 15min. and still no success. Then only if you are Electronicly inclined. Check to see if you get dead completely or you get an indicator light momentarly. Which these are two different symptoms. first dead no indicator. check R931,E994,Q777. Then if indicator light comes on and goes off, check E994 which is fuse opening, C707-1000pf 2kv cap, also check D915, I601, IK04, and 05

Aug 04, 2007 | Hitachi 55FX48B 55" Rear Projection...

1 Answer

Anyone know


Usually this occurs when the Convergence ICs go bad along with some chemical fuses mounted on the deflection board. E994 usually blows along with the Horizontal out transistor going bad. This transistor, I believe is Q777 that usually goes bad. The fuses are either tiny little yellow fuse with a red band or green with a yellow band depending on your model number

Jul 08, 2007 | Hitachi 53UDX10B 53" Rear Projection...

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