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Whether there is picture in AV in put mode
yes
Check pin6 in TDA8844
yes
Check pin13 of N201
yes
Check N201
Check V203 V205 V206
Check if pin27、31、32 in N201
have signal input
yes
Check if R、G、B signal have output
no
Replace N201 TDA8844
No picture
no
Replace N201
no
25
no
Check pin48、pin49 in N201
have IF signal input
yes
HC101、 SF101、 A101
Check N201and its external circuit
yes
Check video amf.Voltage and
video amf.IC circuit
no
no
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