Question about Hitachi 53FDX20B 53" Rear Projection Television
TV would work fine when turned on then after a while it would go 3d looking and hitting it would fix it. Sometimes you would have to hit it harder than other times. Then it got to where it did it more often and it would do it only after a few minutes of being on and now its messed up as soon as you turn it on and hitting doesnt fix it anymore.
I did Magic Focus and it checked red, then froze as soon as it got to green then after sitting on green for a minute it gave black screen with a 4 in the bottom right, which I assume is an error code. So I looked it up in the service manual and here is what it gave for the countermeasure:
1. Check the placement of sensor
2. Adjustment check (H/V size, centering)
3. Conv. amp. gain check *1 (check resistor values only)
*1 -- RK 41, 46, 50, 54, 58, 62 check these resistors.
Looked in Service manual couldn't find anything about RK41 and don't know if its even in the tv.
Symbol Part Part Description
RK46 - AT03193S - 1.5 OHM 1W
RK50 - AT03199S - 2.7 OHM 1W
RK54 - AT03191S - 1.2 OHM 1W
RK58 - AT03206S - 4.7 OHM 1W
RK62 - AT03195S - 1.8 OHM 1W
Also I took the convergence board out just to see If I could see anything obviously wrong and on the bottom there was a wire running from one of the convergence ic's to a Zener Diode RD36E TAPE(B3) SI 500MW 36V not really sure if this is normal or not but I thought maybe that zener diode could be the problem as well but i'm not really sure how to test any of this stuff.
Can someone please help me out here? I took a few picture of what the screen looks like if you need to see them to diagnose the problem. Thanks in advance!
The convergence IC's are bad. (They are probably STK392-110) If you look at the connections, yuo'll probably see little rings in the solder where the pins come thru the board. Your problem probably started as bad connections and has now led to complete failure of the IC's. Replace them both. Look for burned resistors
Posted on Dec 04, 2008
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