Hitachi 32LD660b couple of issues

[josh1e]

Hiya,

I'm hoping to fix my Hitachi 32LD6600b tv.

currently i only have a sky remote (no original) so am limited with remote ablilities.

the tv turns on. a couple of seconds later i see "snow" on the tv tuner input. no channels have been stored, so only snow and channel number, input type on menu. after a few seconds a countdown as no valid channel selected.

the menu button, channel up/down, volume up/down and standby work fine.

the av button causes the tv to "lockup" and become unresponsive. only option is to power off completely and turn on again.

once on again, i am back to square 1. tv tuner input with "snow" and full end user menu access. I cannot change to another source. turning the tv on with vga input and scart input connected with live inputs still has the same problem.


If i am right, (which is unlikely  ) the LVDS is working okay, if not the picture i can see (snow, menu's etc) would all be corrupt..?


I think it is a problem with the AV board? does this sound right to you guys? I am used to working with a multimeter and have mediocre oscilloscope skills

any ideas would be great - ty. if anyone has replacement board or remote for this, please feel free to say,

thanks in advance.

[watteau]

Hello,
Possible fault is memory corrruption.
If I'am correct, the main PCB is a 17MB15, and on these, the memory EEPROM is in
a socket (the eight pin IC near the centre of the board, a 24C.. something), it might be
worth replacing it with a blank one before considering a new PCB.
Sometimes, shorting pins 5, and 6, of this IC, then switching on willl reset it, see other posts
regarding this proceedure.
Regards,
John.

[sparky]

hi
is child lock on try play thro scart skt with ,dvd etcalso
are you in an area were anologue is no longer transmit
dave

[josh1e]

Hi watteau & sparky,

thanks for the advice, I will check on the memory, i didn't notice any socketed chips, but might have overlooked it.... 

your right, the board IS a 17MB15E-3. there are later versions (E-5 & E-7) however I am told these have different connections and power is wired differently, so they wouldn't be a straight swop replacement 

I took the main av board (17MB15E-3) out and cleaned both sides with switch cleaner and a PCB brush. careful not to damage any components or soldered low guage cables... after leaving it 45mins in fresh air to dry / evaporate the cleaner, I re-fitted it and re-connected all the internal cabling,

after performing a factory reset via the service menu, the tv is working great! 

I've had it on test for 12 hours as well as checking other sources all work fine. other than quite a grainy image, it'll do great for my teenage son,

thanks again for your help,


kr,