Question about Hitachi 61SWX10B 61" Rear Projection Television

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No audio - replacing surround pwb every 2 years

I've just ordered my 4th surround pwb in 8 years. Does anyone know what is failing on this board? I'm capable of repairing the board myself but don't have much troubleshooting equipment anymore. I inspected it under a magnifying lens and did not see any heat-related damage, leaking caps, etc. I also sprayed cool-down on the ICs and board in general, and flexed the board while in operation - no change in symptoms.

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  • Dick Berry Jan 26, 2009

    I have the full service manual including schematics. I may try to inject some audio on the input and trace it until it fails to come out, depending on how complicated the power supply and supporting signal connections are. The mouting position in the TV makes it too difficult to do in-place. It will need to be on the bench for me to tackle it.



    As for heat, it seems to fail only after warm-up, that's why I tried cool-down spray. I can wait for it to fail then hit it with cool-down - but no change.



    If I find a solution I'll post it here. It seems many people with Hitachi TVs are experiencing this problem, and the supply of rebuilt boards is drying up. I found one at Sears after trying several parts suppliers found via Google. Most of them want me to send the board in.



    Thanks for your comments.

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Hello dickberr,

From what you have said it is not a thermal problem (hot or cold sensitivity) By the way did you try to test it with heat? a hair drying gun works great, not a circuit integrity problem (solder joints and cracks). That leaves component failure as the possible cause. What you could do is to get a known good board and and use it as a comparison to a know bad board, using a huntron tracker (can be gotten on ebay) or taking voltage measurements and comparing them them to the known good board and vice verse. This will at least give you an idea of which component might be malfunctioning. As you know you will need a schematic, and a voltmeter for the test of the voltage levels.

I believe that the problem is in the output stage after the board in question, something is causing the board to overdrive and this might be destoring the board. Try the heat test and take measurements to check the voltage levels on the good and bad boards.

I hope this helps,

Thank you,

Shuttle83,

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

Posted on Jan 26, 2009

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I plugged my marantz sr 8002 into 220 volts


  • There are a total of 8 fuses of varying types, wattage, and amperage ratings.
  • Disconnect the power cord to your surround receiver and let it sit for a while; hopefully capacitor drain will have occurred; just the same be careful not to contact any of the high voltage ones. They can knock you on your boom-boom or send you to the Pearly Gates before it's your time.
  • Remove the casement cover; look for the Printed Wiring Board (PWB) labeled REG_PWB...this is the regulator printed wiring board.
  • Following the circuitry from the main transformer there are 2 (two) fuses; one is located at position number F901 and the other at F902. Both are Time Lag 382 series radial lead fuses made by LITTLE FUSE. And both are 5-amp 250volt rated fuses- check for continuity using an Ohmmeter with tone. If you get tone, the are okay. If not, you'll have to de-solder them and solder in new one(s)
  • On the same board, there are 2 (two) fuse resistors rated at 0.33 Ohms, 1 watt; check their resistance values using the Ohmmeter scale. You will find their position markings at R903 and R904 on the PWB. If your resistant readings are below the spec values, you'll have to replace them.
  • The remaining fuses will be found on the PWB labeled, Standby PWB A. Check them using the continuity tester with tone.
  • Between position markings F701 and F703 the schematic shows a 10-amp/250 volt fuse
  • At position marking 701 there is a time lag series 6.3-amp/250 volt fuse.
  • At position marking F702 and F703 are 2 more fuses, both are the T382 "Little Fuse" series fuses rated at 3.15-amps/250 volt.
I believe that covers it...hope all works out well. :)

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1 Answer

What is the error code e7-80 on a Sharp ar-m450u ?


E7-80 MFP-SCU PWB communication error

Cause
SCU PWB connector connection trouble.
SCU PWB - MFP PWB connection trouble.
SCU PWB mother board connection trouble.
SCU PWB trouble.
MFP PWB trouble.
Mother board trouble.
Check & Remedy
Check connection of the SCU PWB, the MFP PWB,
and the mother board.
Check the ground.
Replace the SCU PWB.
Replace the MFP PWB.
Replace the mother board.

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1 Answer

C-3c50


C3C50 at power up.

PROBABLE CAUSES:

1. Loose connectors or failed PWB-C board.
Reseat all connectors and then replace PWB-C board (p\n 65FA-9360) if necessary.


2. Poor connection for the interface cable between the MFP and scanner.

Reseat the MFP-to-scanner interface cable its a large molex cable with thumb screws to remove on the outside of case.(p/n 4581-6876-01).


3. Failed PWB-F board.

Replace PWB-F board (p/n 4025-0103-27). Flash MFP with most current firmware. The latest version firmware or system software is available via the Konica Minolta Download if you need help with this write me back.


4. Incorrect scanner serial number.

Access service mode and select System Input. Verify the correct scanner serial number has been input under Serial # Input.this is in Service mode. if you need help with this write me back

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1 Answer

We are having xerox 1038 model usa made . we are getting the error u6 when we switch on our machine . so plz suggest us the best possible way to fix up the problem ...`````


U6-1 The main PWB failed checking the ROM.

Shut down and restart the copier. If it appears again U6-1, replace the main PWB.

U6-2 The main PWB failed checking the RAM.

Shut down and restart the copier. If it appears again U6-2, replace the main PWB.

U6-3 and U6-4 The main PWB failed to check the battery MNV (U6-3). Or the main PWB does not properly initialize the NVM (U6-4).

Follow the procedure in the development of memory to initialize the NVM, code 20-96. Shut down and restart the copier.

Jul 20, 2011 | Office Equipment & Supplies

1 Answer

I have a hitachi 62in. Model # 61swx10b My sound has gone out what can i do or check to fix it?


There is most likely an issue with the Surround PWB since you have the DP17 chassis. I would check the following items on the surround board. I have seen them all several times with the DP17

IT02 Shorted, pins 92 and 93 caused by Solder splash. IT02 Is also known to fail. Also pins 42, 43, & 44 have been known to have cracked solder
IT05 pins 20 & 21 shorted also Seems to have been caused by too much solder.

IS13, pins 1 & 2 shorted ( too much solder

Also check for cracked circuit trace patterns under IT05If you need further assistance let me know.

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1 Answer

Display scrambled on my model # LMVM2055ST


HI. this LCD is attached to the PWB assembly board. Unfortunately, this lcd is not sold separately and, you will need to replace the whole PWB assembly in order to fix this issue.This is actually a pwb(pcb) assembly failure.

CLICK HERE TO ORDER YOUR NEW PWB ASSEMBLY(LCD)

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1 Answer

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Bad capacitors on the FMT pwb is what is most likely causeing it are the lines going sideways acrooss the screen, yet the menu appears normal.? If so its bad capacitors. You can get the V26 FMT repair kit at the following link which has the replacement capacitors and instructions on how to do the repair. You may also have an issue with the terminal 1 and terminal 2 pwb in that model as virtually every board within the chassis is plauged with Capacitors that fail. Heres the link.
http://servicemanuals.vstore.ca/

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1 Answer

Coloured Pixels in or around black areas when watching TV


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I purchased a manual online and found my solution in it.
I have a Philips 42PF7220A/37 Plasma TV. The TV worked great one evening, I watched a movie and turned it off. The next morning when I turned it on, the TV didn't have a picture, the green power light came on and after a little while it went off and then I got the red flashing LED. 5 Flashes, then 2 seconds nothing and then it repeats. According to the manual this indicates that there is a severe hardware problem. Didn't sound good to me.
However, further in the manual it had some repair tips. I thought I'd give it a try.
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The manual says you'll probably get error 12 blink???
The solution is; disconnect the cable between the SSB and the Audio PWB and also the cable between the Main Power Supply and the Audio PWB. In my case that disconnected every plug on the Audio PWB. On my TV the Audio PWB is located Top Right, it is a small board of about 6x3" I then Powered the TV and the TV initialized. I was then able to get the Menu via the remote. I then turned the TV off, connected the antenna and turned it back on. To my surprise it worked again. Picture and sound. Thank you very much, it probably saved me about $ 750.-
I don't quite understand how this could happen, except that the night before I muted the TV. After about 15 minutes or so the sound came back on, so I muted it again. After that I turned it off and you know the rest.

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