Hi everyone. I'm looking for some help with a projection tv Hitachi 50SBX78B. The red power light comes on when plugged in but that's it, no sound or picture. On the chip board there are about 8 led's that all light up but one is very dim almost not lit at all. This led is marked D940 +B 120v. I haven't been able to locate a service manual and really don't want to screw up this tv as it's a pretty nice 50" television. Can anyone help me out at all?
Randy, this set has a common problem where the coolent in the CRT's leak out on the printed circuit boards Also there are issues in the main power supply of this TV set. You will need a service manual and a mutimeter and most likely a capacitor checker. You would need to start out by first looking around the bottom board of this TV forsigns of moisture, and if you do see like an oily substance on the board, you must clean off these board before any damage happens to the board. If you have no electronic circuit training, I highly advise you to call in a pro to assist you in this repair. Good Luck and let us know what you find wrong with this TV set.
Thanks Larry. I'm going to try and find a service manual somewhere online. I'll let you know what I can figure out.
Well I managed to fix it! Turned out to be C707 a high voltage capacitor and E994 a protector fuse. I replaced both plugged it in and we were up and running. All Led's in the board nice and bright!
Good Job Randy. Thanks for letting us know.
if you still have it, I have truck and will pick it up. Call me (510) 472-8569 for arrangements.
You can get the parts from www.TvRepairKits.com They have put together a kit that includes the parts and instructions to fix the following models (50UX58B, 60UX58B, 50UX58K, 60UX58K, 50SBX78B or 60SBX78B). The kit includes the E994 pico fuse and the C707 capacitor.
We put together a repair kit for anyone who needs the repair instructions, parts ( E994 & C707) and service manual. You can get it at www.tvrepairkits.com
Being that you work at tvrepairkits.com would you be so kind as to