2. No Raster
No Raster
Is CRT |
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| Is Heater | Yes | Trouble in | |||||
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| Voltage (CRT PWB) | ||||||||||
heater |
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| CRT | |||||
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| about 6V? |
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Turn the Brightness |
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| Trouble in |
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& Contrast control |
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| power supply |
| power supply unit. | |||||
to set Maximum |
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| circuit |
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| Yes |
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Is whole |
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| Trouble in power |
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screen bright? |
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| supply circuit |
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| Yes |
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Check | No | ||
G1 voltage about | |||
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| Yes |
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Is CRT
G2 (screen) voltage No about 730V?
| Yes |
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Is 100Vdc | No | |
line normal? |
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Yes
Does
the Brightness control No make screen
bright?
Yes
Raster OK
Trouble in G1 line
Trouble in FBT or its pin4 ambient circuit
Trouble in 100Vdc | Refer to trouble | |
line of power | ||
in P.S.U | ||
supply unit | ||
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High Voltage trouble in FBT
16
