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Re: AKAI Rear projection...
The back panel of the tv where the inputs go. that panel is usually attached to the signal board by clips. Resolder the clip pins on the back side of the signal board. The tuner should be a small rectangle box with a coax cable coming from it going to the coax input on rear panel. resolder where that tuner attaches to the signal board.
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Set may have two tuners or a combined one (no model here) and average cost is well over 100 just for the part--it is soldered in.
IF the tuner is bad there is another option---if a DVD etc works via rear audio/video inputs you can route with a box signal in the same way to one of those inputs---bypass the tuner and use the box for signal and changing channels.
Google the model number of the set with "parts" if you want to try to locate the tuner or the entire board (may not be available).
hi, the input blocks are where you will need to look for this problem. sometimes these block connection become lose and detached from the main logic board. this could happen due to a minor crack in the solder or to much pressure when inserting cables and input rac jacks etc.. replacing or repairing this section of your TV's board will fix this issue.
Try looking over the tuner solder joints as well as the pins where Input board feeds to the singal board. Sounds like a solder issue or a weak capacitor. Check the solder with a good quality magnifying glass. Let me know how you make out and I will try to help you through the process to nail it down.
1) IT02 Shorted, pins 92 and 93 Cause: Solder splash 2) IT05 pins 20 & 21 shorted. Cause: Seems to have been cause by too much solder. 3) IT02 was found to be defective. Cause: Defective component. 4) IS11 missing circuit trace. Cause: Caused by some one that replaced/removed this IC previously. 5) IT02 solder, pins 42, 43 & 44 Cause: Two boards found with these same pins with cracked solder 6) IS13, pins 1 & 2 shorted Cause: Seems to have been cause by too much solder. 7) Audio Quits when board is tapped. Cause: Soldered all IC's on bottom of board. Also soldered IT04, I516, I517, I510, I501. 8) Also, please resolder IT05 and IT06 9) Check for cracked patterns under IT05
It sound like the components are ok. Are any of the component leads
discolored from excessive heat? If so it may be that the resolder looks
ok but is not actually adhering to the lead. Use solder wick or a
desolder iron to remove the old solder, clean the lead(s) by scraping
with a sharp knife edge to bare good metal and resolder.
If you have a good picture except for a missing color all the various circuits are working OK. Most likely you have a bad solder joint or component in the red circuit. This would also be indicated by the fact that ocassionaly the red pops in. If you have the experience remove the boards and inspect for cracked or cold solder joints. Resolder anything that looks suspicious. If this does not fix it you will have to troubleshoot the red drive circuits from the CRT back to the video IC. Another possibility is that you have a bad/intermitant red crt. I doubt that you have the equipment to check this but you can test it by moving the green crt board to the red crt. If it now works the red crt is OK. If all this fails you will need to find a reputable repair shop to look at it. If the unit is more than 5 years old it may not be worth fixing. Good luck.