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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Panasonic 29" Tv red screen
Panasonic 29" TV, Model TX-29GF10X
Has a red tinge over the complete picture. No green is showing. Just red and blue. Measured the KB,KG and KR (assuming these are the cathode voltages) on the CRT board with it connected and disconnected KB =120VDC KG =195VDC KR =195VDC Also removed the board from the CRT and did the same test and same voltages apply. Going to swap some of the output transistors but am pretty sure they ok. Where to look next??? Thanks TEX |
#2
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Panasonic 29" Tv red screen
TEX wrote:
Panasonic 29" TV, Model TX-29GF10X Has a red tinge over the complete picture. No green is showing. Just red and blue. Measured the KB,KG and KR (assuming these are the cathode voltages) on the CRT board with it connected and disconnected KB =120VDC KG =195VDC KR =195VDC Also removed the board from the CRT and did the same test and same voltages apply. Going to swap some of the output transistors but am pretty sure they ok. Where to look next??? Thanks TEX Did some more. Swapped the transistor gun outputs (KR and KB) and the colours changed. So the screen that normally is blue when you get no TV signal is now red. Proves that the tube should be sweet. Can see a bit of green in this config, but very low. So it obviously is a signal issue. This is where it is out of my league. TEX |
#3
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Panasonic 29" Tv red screen
Trace the lines back from the crt board to the main board, you will probably
find a open driver transistor in the video circuit. Check the voltages right at the video processor ic and the drivers. "TEX" wrote in message news:1154058004.886587@ftpsrv1... TEX wrote: Panasonic 29" TV, Model TX-29GF10X Has a red tinge over the complete picture. No green is showing. Just red and blue. Measured the KB,KG and KR (assuming these are the cathode voltages) on the CRT board with it connected and disconnected KB =120VDC KG =195VDC KR =195VDC Also removed the board from the CRT and did the same test and same voltages apply. Going to swap some of the output transistors but am pretty sure they ok. Where to look next??? Thanks TEX Did some more. Swapped the transistor gun outputs (KR and KB) and the colours changed. So the screen that normally is blue when you get no TV signal is now red. Proves that the tube should be sweet. Can see a bit of green in this config, but very low. So it obviously is a signal issue. This is where it is out of my league. TEX |
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