Question about Hitachi 53UWX10B 53" Rear Projection Television

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Convergence I have a 2002 Hitachi 53uwx10ba, its got the blue and yellow shadows. from what I've read for the solutions, it seems that I need to replace the convergence ICs. I wanted a second opinion on the correct part to use. I think the original part is stk392-110 and I was told I could use stk394-160. Is this true? There's a kit I can get online but I want advice first. Thanks, diduni

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Hello diduni,

Yes you can use them but read this first:

I could not have said it better myself, I keep this around for times like this.
The various IC's have different specs, one important one is the quiescent current. The higher number STKs have a higher quiescent current (+10%) If you replace a STK 392-110 with an STK 392-150 the small value resistors will "smoke" in many cases and have to be changed with different values. The different TV Help blogs are full of people that have put in the "new and improved" ICs then asked what to do now, all the resistors have smoked or the unit will not start. Hitachi has considerable information on the use of these ICs. In all cases they tell you to change the resistors for different values, to allow for the higher idle current. They also include information regarding alignment for minimum idle current in the circuit. This relates to height, width and hor/vert centre.
The design of the TVs is ok, the IC's fail from AC power bumps or lightning (accumulated damage to junctions over time). Semiconductors will run forever if they have a smooth DC power source, are ventilated to operate within temperature specs, and not overdriven. This was demonstrated when com satelites were first used. They had estimated electronic failure in 4 to 6 years and many last 20+ years. They are replaced when they run out of manouvering fuel or get an induced power surge from the sun. When the IC's run too "hot". there is usually a low ohm resistor that has increased in value and causes higher current output from the chip through the feedback in the circuit design. The resistor(s) may have changed from 1.8 ohms to 2.5 ohms, the TV will still run, but the IC will fail prematurely.
STK 392-110 will work fine if all the small value resistors are ok and the TV is not subjected to a hotter environment than normal or power line related troubles. Many RPTVs are mounted in enclosed areas with no air circulations or in direct sunlight. These situations will cause the unit to operate at raised air temperature around the IC's resulting in more failures. Some people have "hotter" houses than others, their convergence IC's will fail sooner.
If you can redesign the convergence circuits and waste your time replacing all the low ohms resistors, go for it. Otherwise use the STK 392-110, or whatever the manufacturer had in the unit. I know from experience. When Hitachi came out with "new and improved" replacement ICs we installed many STK 392-120 for STK392-110 in Hitachi and other makes. The result was many burnt resistors, many call backs and big expense. The same applies to the Samsung STK392-010 or STK392-040. Use the original IC.

This was borrowed from:
http://www.techlore.com/forum/thread/22290/Rear-projection-TV-STK-392-120-LG-convergence-problem/

from: easyab

I hope this helps

Shuttle83

http://www.electron-age-technologies-llc.com

Posted on Dec 23, 2008

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Electronix Online - Electronic Parts & Accessories for Technicians and Hobbyists
------------------------------------------------------
Order Number: 35987
Detailed Invoice: http://www.electronix.com/catalog/account_history_info.php?order_id=35987
Date Ordered: Monday 09 October, 2006
Ordered from IP Address: 65.33.214.137

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Products
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Sub-Total: $11.98
Tax: $0.00
Shipping: $6.30 via USPS priority Mail 1 X 0.7
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http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
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