Question about Hitachi 50SBX70B 50" Rear Projection Television

1 Answer

I have a hitachi 50sbx70b

I was watching it and it started making a crackly sound then justed went of what could be wrong with it. when i took the back of 5 lights light up then 2more then it turns off but wont turn on but the 120v green light dont come on.

Posted by robert1984 on

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Cary Farah

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Sounds like either a tube is arcing or h.o.t is arcing.

Posted on Jan 29, 2008

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ctf1800

Cary Farah

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SOURCE: hitachi 50sbx70b

This update covers to the following Hitachi models and chassis
46UX50B/51K, 50UX52B/53K, 60UX54B/55K, 50SBX70B, 60SBX72B, 70SBX74B. All projection televisions using the AP73 & 74 chassis's From Dennis Viereck
SYMPTOM:
Intermittent loss of Raster, On Screen Display, sometimes sound. BUT ALWAYS HAS HIGH VOLTAGE! Also removing power and reapplying it again restores operation.
THE PROBLEM: There is a lack of a secondary ground for the CRT Dag connected to each CRT board. You can identify this missing ground on the CRT board by locating two vacant pins on each CRT driver board near the CRT socket. The connector is named P801, P831, and P861 relative to each board. The pin nearest the socket is the ground pin in question. The pin furthest from the socket is connected to the cathode of the CRT.

OBJECTIVE: Run a separate ground wire from the "GROUND" pin on each CRT board to the chassis ground. You can use the circuit board mounting screw on the frame under the green CRT. See drawing below.
DIRECTIONS: Obtain 3 wires 10, 14, and 18 inches long. The wire is 18 gauge stranded with an insulated jacket. Attach one wire to each ground pin on the CRT socket. Choose the correct length of wire so that all wires will connect to the circuit board mounting screw near the center of the chassis frame.

EXPLANATION: The extra ground is needed if an internal arc occurs in the CRT. This energy must find a path to ground. Before, the only path to ground is through the signal ground wire on the RGB drive connector. This thin wire does not go directly to chassis ground and is inadequate ground for the CRT dag. If the energy level of the discharge is high enough it may corrupt the data flow on the data & clock lines or negatively effect the OSD microprocessor. Since electricity takes the shortest path to ground, the additional ground wire will route the majority of that static pulse to chassis ground quicker and reduce the possibility of corrupting operation of the OSD processor.

Posted on Jan 04, 2008

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Dec 06, 2008 | Hitachi 43UWX10B 43" Rear Projection...

1 Answer

Please help need to watch tv


Well this gives you someplace to start!
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Jan 29, 2008 | Hitachi 50SBX70B 50" Rear Projection...

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Symptom: DARK PICTURE
Cause: DEFECTIVE 3D/YC COMB FILTER
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Cause: DEFECTIVE C724

Jan 16, 2008 | Hitachi 50SBX70B 50" Rear Projection...

1 Answer

My 50SBX70B flicks than lost the power


Symptom: NO HOR SYNC
Cause: DEFECTIVE I008
Symptom: No Horizontal Sync. When PinP is called up, main picture may lock up for a 8 moment, then it goes back out of sync.
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Jan 15, 2008 | Hitachi 50SBX70B 50" Rear Projection...

1 Answer

Hitachi 50sbx70b


This update covers to the following Hitachi models and chassis
46UX50B/51K, 50UX52B/53K, 60UX54B/55K, 50SBX70B, 60SBX72B, 70SBX74B. All projection televisions using the AP73 & 74 chassis's From Dennis Viereck
SYMPTOM:
Intermittent loss of Raster, On Screen Display, sometimes sound. BUT ALWAYS HAS HIGH VOLTAGE! Also removing power and reapplying it again restores operation.
THE PROBLEM: There is a lack of a secondary ground for the CRT Dag connected to each CRT board. You can identify this missing ground on the CRT board by locating two vacant pins on each CRT driver board near the CRT socket. The connector is named P801, P831, and P861 relative to each board. The pin nearest the socket is the ground pin in question. The pin furthest from the socket is connected to the cathode of the CRT.

OBJECTIVE: Run a separate ground wire from the "GROUND" pin on each CRT board to the chassis ground. You can use the circuit board mounting screw on the frame under the green CRT. See drawing below.
DIRECTIONS: Obtain 3 wires 10, 14, and 18 inches long. The wire is 18 gauge stranded with an insulated jacket. Attach one wire to each ground pin on the CRT socket. Choose the correct length of wire so that all wires will connect to the circuit board mounting screw near the center of the chassis frame.

EXPLANATION: The extra ground is needed if an internal arc occurs in the CRT. This energy must find a path to ground. Before, the only path to ground is through the signal ground wire on the RGB drive connector. This thin wire does not go directly to chassis ground and is inadequate ground for the CRT dag. If the energy level of the discharge is high enough it may corrupt the data flow on the data & clock lines or negatively effect the OSD microprocessor. Since electricity takes the shortest path to ground, the additional ground wire will route the majority of that static pulse to chassis ground quicker and reduce the possibility of corrupting operation of the OSD processor.

Nov 12, 2007 | Hitachi 50SBX70B 50" Rear Projection...

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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...

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