Vizio VP50 HDTV20A Service Manual - Page 24

Subwoofer_side, Audio, Display, Correctly

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(SUBWOOFER_SIDE, AUDIO) IS NOT DISPLAY CORRECTLY Start Input signal good? Yes J1 input correct? Yes U1~U6output correct? Yes U7.U8 signal correct? Yes U7.U8 Volt correct? Yes U7.U8 output correct? Yes END N0 1. Check Audio source 2. Check the player of source N0 1. Check signal of Main Board 2. Check signal of Audio Board (J1) 3. Having TX and RX module or not? N0 1. Check the output volt of U1 ~ U6. N0 1. Check C200(Ch R) and C201(Ch L) and C170 (Ch SW) and C171 (VB) N0 1. Check VCC of U7 and U8. 2. Check 1/2VCC of U7 (R202.R203). 3. Check ZD2(Ch R) and ZD3(Ch L) and ZD4 (Ch CT) N0 1. Check feedback resistor and capacitor. CONFIDENTIAL - DO NOT COPY Page 9-8 File No. SG-0246

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CONFIDENTIAL
–
DO NOT COPY
Page
9-
8
File No. SG-0246
Yes
N0
N0
N0
Yes
Yes
Yes
N0
Yes
N0
N0
Yes
(SUBWOOFER_SIDE,
AUDIO)
IS
NOT
DISPLAY
CORRECTLY
Start
Input signal good?
1. Check Audio source
2. Check the player of source
J1 input correct?
1. Check signal of Main Board
2. Check signal of Audio Board (J1)
3. Having TX and RX module or not?
U7.U8 signal correct?
1. Check the output volt of U1 ~ U6.
END
U1~U6output correct?
1. Check C200(Ch R) and C201(Ch L)
and C170 (Ch SW) and C171 (VB)
U7.U8 Volt correct?
1. Check VCC of U7 and U8.
2. Check 1/2VCC of U7 (R202.R203).
3. Check ZD2(Ch R) and ZD3(Ch L)
and ZD4 (Ch CT)
U7.U8 output correct?
1. Check feedback resistor and
capacitor.