Hi team,
My customer is using UB921 and UB940 for their application as below.
Issue: LOCK frequently unlock, and flicker screen.
Test has been done:
1. 940 Pattern mode:
|
test |
LOCK status |
|
1. pattern mode: internal CLK, internal timing |
GOOD |
|
2. pattern mode:external CLK, internal timing |
GOOD |
|
3 . pattern mode: external CLK, external timing |
GOOD |
2. 921 Pattern mode:
|
test |
LOCK status |
|
1. pattern mode: internal CLK, internal timing |
GOOD |
|
2. pattern mode: external CLK, internal timing |
NG |
|
3. pattern mode: external CLK, external timing |
NG |
3. Enable 940 link error count with 0x41=0x1F. no more unlock and display back to normal
4. fixed EQ at level 0 to 3, reduce the Unlock frequency, but still unlock
5. 940 MAP analysis as below.
Next to test:
1. PCLK jitter of UB921 input side.
2. CMLOUT of UB940
Do you have any more advice or test you may want to do for this case?
Thanks!
