I have a DCLLCD DCL7A that when turned on shows a very (and I mean VERY) quick flash of the back lights and then goes to a black screen. I have read several threads on badcaps.net concerning the LM004 Rev:3 inverter board. I have replaced all of the electrolytic caps with Panasonic FM / FR and have even swapped out the big capacitor with one of equal value. I have resoldered the pins on the two transformers and also the grey block capacitors near the transformers (one of the legs of one of the capacitors had a cracked joint).
I have measured the transistors as follows:
Q6:
0.599 kohms
1.930 kohms
1.212 kohms
Q7:
0.600 kohms
1.929 kohms
1.212 kohms
Q11:
174.6 ohms
128.5 ohms
90.6 ohms
Q12:
174.8 ohms
128.8 ohms
90.4 ohms
The voltages on the connector to the input board from top to bottom (in the overall picture of the boards):
0 VDC
4.84 VDC
4.84 VDC
0 VDC
4.87 VDC
4.87 VDC
4.87 VDC
0 VDC
0 VDC
4.03 VDC
0 VDC
0 VDC
no wire
0.657 VDC
4.72 VDC
The voltage across the main capacitor is 160.1 VDC
The voltage across the start-up capacitor is 13.73 VDC
Forgive me for the pictures since it's been raining here for the last two days and I couldn't take them outside in natural light. The back side of the input card is a little blurry and I can take it again if someone needs any information from it.
I have measured the transistors as follows:
Q6:
0.599 kohms
1.930 kohms
1.212 kohms
Q7:
0.600 kohms
1.929 kohms
1.212 kohms
Q11:
174.6 ohms
128.5 ohms
90.6 ohms
Q12:
174.8 ohms
128.8 ohms
90.4 ohms
The voltages on the connector to the input board from top to bottom (in the overall picture of the boards):
0 VDC
4.84 VDC
4.84 VDC
0 VDC
4.87 VDC
4.87 VDC
4.87 VDC
0 VDC
0 VDC
4.03 VDC
0 VDC
0 VDC
no wire
0.657 VDC
4.72 VDC
The voltage across the main capacitor is 160.1 VDC
The voltage across the start-up capacitor is 13.73 VDC
Forgive me for the pictures since it's been raining here for the last two days and I couldn't take them outside in natural light. The back side of the input card is a little blurry and I can take it again if someone needs any information from it.
Comment