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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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Samsung TXJ2754 bottom half of vertical missing
This set has some (1/2 inch) retrace lines at the top of the CRT. From
the center down there is no vertical deflection. I've changed some capacitors in the vertical along with the vertical output IC (LA7845) and have the same problem. All low value resistors in Vertical look good, no obvious signs. Ther are several zener diode that look ok in circuit along with other diodes / transistors. Does anyone have any information on this set ? I've Googled and found no vertical problems with this model. Take Care ! |
#2
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Samsung TXJ2754 bottom half of vertical missing
carneyke wrote:
This set has some (1/2 inch) retrace lines at the top of the CRT. From the center down there is no vertical deflection. I've changed some capacitors in the vertical along with the vertical output IC (LA7845) and have the same problem. All low value resistors in Vertical look good, no obvious signs. Ther are several zener diode that look ok in circuit along with other diodes / transistors. Does anyone have any information on this set ? I've Googled and found no vertical problems with this model. Take Care ! Grab a datasheet for the vertical out IC, check and make sure both positive and negative supply rails are present if used, aside from that check any remaining capacitors and solder joints. |
#3
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Samsung TXJ2754 bottom half of vertical missing
Jim,
I think it may be an EPROM problem as searching the WEB pointed to EPROM problems with this set (although the problems weren't vertical). I called the owner of the set for the remote (needed to adjust Vertical heighth / linearity). I'll write the numbers down then adjust them. I'll also take your advice on the datasheet. Thanks. James Sweet wrote: carneyke wrote: This set has some (1/2 inch) retrace lines at the top of the CRT. From the center down there is no vertical deflection. I've changed some capacitors in the vertical along with the vertical output IC (LA7845) and have the same problem. All low value resistors in Vertical look good, no obvious signs. Ther are several zener diode that look ok in circuit along with other diodes / transistors. Does anyone have any information on this set ? I've Googled and found no vertical problems with this model. Take Care ! Grab a datasheet for the vertical out IC, check and make sure both positive and negative supply rails are present if used, aside from that check any remaining capacitors and solder joints. |
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