Hansol H950VI B19BF, Service Manual, Page: 14 / 41

Troubleshooting
Service Manual 14
4. Troubleshooting
4-1 Micom(WT61P4L44)
We can check the micom operation correctly by press the soft power switch.
When the chip does not operate in the normality, power indicating the LED is always extinguished.
In the normality, if the screen appear 'No Signal' or 'No Cable', the LED is green amber.
When the screen is displayed, the LED is green light.
4-2 When the LED operate in the abnormality
4-3 When H950 is not displayed in abnormality.
4-3-1 When screen is just white !
LVDS CABLE Check connection of LVDS CABLE. LVDS CABLE
Does appear white screen ?
U6 Does appear DC 3.3V at pin 4 of U6 ? U6,U7 &
U7 Does appear DC 2.5V at pin 4 of U7 ? Related circuit
U4 Dose proper Clock pulse(14.3MHz) at U4
122,123pin of U4
J1 Dose appear active signal pin 10,11,22,23 of J1 U4
Replace Panel !
Diagram
Check
point
Order
Check &
Replace Item
YES
YES
YES
YES
Press the soft power switch! Key PCB
The Screen is normal, only the key is abnormal.
U2 Does appear DC 5V at pin 7 of U2
U2 Does appear Clock pulse(12MHz) at pin 9,10 of U2 Y1
U2 Does appear active low input at pin 25 of U2 U2
U2 Does appear DC 5V at pin 5 of U2 U2
Update the latest F/W of H950 and check the LED. Replace
Does it update in normality ,and operate the LED? Main PCB !
It's fine !
Diagram
Check
point
Order
Combo B/D
&
D21,22,23
Check &
Replace Item
NO
YES
YES
YES
YES
YES