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Sound Board A-12738-50020 WH20
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Question
stuba
I have a couple of interesting problems and they may be related, fairly new to this so would appreciate someone double checking my approach - Someone also may have encountered something similar and maybe can point me straight to problem.
2 problems on powerup.
1. Factory reset every time. Batteries are fine. Battery holder is fine and correct voltage on CPU board (4.8). Following Marvins guide I have tracked problem to D2 which is testing 4.8 one end and 2.2 other end - should only be a .5v drop so conclude replace D2.
2. The main problem. I get 5 beeps on powerup (U14 error). I then get 2 U14 checksum errors (Sound board and bigfoot). The board did not have a U14 eprom when i got it - there were no sound effects, voices. From what i can gather U14 has the voices, sound effects. I replaced the U14 - same errors.. BUT sound testing now has all the voices sound effects except the 100M(?) which is a staticcy noise. Also note the sound board has cooked LM1875 which has been replaced (prior to me) and is obviously working (but job is a bit rough), looks like C15 replaced at same time.
Concerns/Issues/Questions:
Can the CPU board problem be affecting the sound board?
The U14 i put in was good and as proof it's working but why i am getting the 5 beeps error if its good, can a ROM partly be bad, one sound effect is missing?or could this be in the SB itself? maybe a U14 trace/component broken or dry?
I can swap a TZ board in to check the ROMS but don't want to do this until the CPU board problem fixed. Don't want to screw up my TZ board as well.:redface
Approach From Here:
Fix the D2 CPU problem. See if this makes any diff to SB. Test the ROMS in the TZ board - swap the TZ board into the wH20 and see if the ROMS ok. This will isolate prob to SB or ROMS. One other question while I'm going - sound quality is not great - is it worth just replacing all the caps on the sound board anyway? does anyone do this as a matter of course? Overkill?
Any thoughts, comments appreciated. I want to be sure I'm barking up the right tree.:unsure
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