short test for IC10
Check again whether the marking on the circuit shows the display (ok, already done 100 times)
Use a protective resistor Rp approx. 220 Ohm (against unwanted short circuit), do not connect voltages directly to the PINs.
Connect voltmeter to PIN7
+ 12V via Rp at PIN5 -> PIN7 high, about 12V
+ 12V via Rp at PIN6 -> PIN7 low, about 0V
0V via Rp at PIN6 -> PIN7 high, about 12V
0V via Rp at PIN5 -> PIN7 low, about 0V
Connect PIN7 and PIN6 directly (analog IC10A) -> PIN7 5V +/- (approximately equal to PIN5); if 12V -> IC defective?
remove the wire PIN7 - PIN6
if no 5V +/- at PIN7:
if 5V +/- at PIN7 -> C22 defective ???
if further 12V -> IC10 defective ???
The voltages at PIN7 and PIN1 should be approximately the same.
vy 73 Reiner