[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-560923-105":59,"doc-detail-560923-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","ph-gr1ax-dead-troubleshooting","PH GR1AX - Dead Troubleshooting","","Troubleshooting notes for a device labeled PH GR1AX that fails to start or shows abnormal behavior. The checklist covers multiple “Dead” symptoms including loss of line oscillation, low or missing 95V/HT rails, standby light flashing, protection triggering, short circuits in the line drive/LOP stage, leaky zener diodes, faulty capacitors, and problems around the TDA8305/TDA2579 timebase and startup pulses (e.g., IC 7020 pin 11 and pin 26).",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/ph-gr1ax-dead-troubleshooting/560923/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/ph-gr1ax-dead-troubleshooting/560923.png","ImageObject",300,407,{"name":92,"@type":93},"Terk","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/octet-stream","2026-10-24","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What checks are recommended when the set is dead with no line oscillation?","Question",{"text":112,"@type":113},"Verify the startup and line-osc inputs, then check relevant capacitors and zener components such as C2519 (150pF), the 12V zener at pin 26 with TDA8305, and the noted Zener/zener-related parts listed in the checklist.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How should low or missing 95V/HT rails be diagnosed in this log?",{"text":117,"@type":113},"Check the HT/95V rail at the PSU, then inspect the specified zeners and capacitors (including parts like D6610/D6613 and C2618), and confirm whether the HT rises correctly before proceeding to the line-drive stage.",{"name":119,"@type":110,"acceptedAnswer":120},"What actions are suggested for sets that won’t exit standby or fail to start from cold?",{"text":121,"@type":113},"Inspect the standby-to-on path: change or verify the EPROM (IC7785 ST24C02CP) for standby exit failures and replace startup capacitance such as C2058 (33uF to 47uF 100V) when cold-start issues occur.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},560923,1792144397,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":8,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":81},1099525198933,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","PH GR1AX\n\n1. Dead\t\n-CHECK L5524 - 9v SUPPLY TO LINE OSC FROM PIN 26 STARTED FROM PULSE ON PIN 11 OF i.c. 7020\n\n2. DEAD , NO LINE OSC.\t\n-Check C2519 ( 150pF ) pin 26 TDA8305 Check D6030 12v ZENER & D6523\n\n3. Dead - st/by light flashing - ht=70v \n-Loptx faulty\n\n4. Dead\t\n-D6546 BY228 EW mod diode s/c, F1534 fuse blown;\n\n5. Dead\t\n-D6613 15v zener, D6610 10v zener & D6644 1N4148 all leaky & LOP Tr s/c - check R3616 & R3680 1R in series\n\n6. Dead\t\n-L5519 o/c; C2523 6ｵ8 63v low cap\n\n7. DEAD , NO LINE OSC.\t\n-Check C2519 ( 150pF ) pin 26 TDA8305 Check D6030 12v ZENER & D6523\n\n8. Dead - 95v HT low at 15v\t\n-C2618 27nF o/c - blue plastic body\n\n9. Dead - HT at 15v\t\n-D6610 BZX79C10 leaky\n\n10. Dead - HT at 8v\t\n-R3613 120k in startup fet cct hi res\n\n11. Dead - HT ok - no lop activity\t\n-L5224 supply to line dr discoloured & o/c\n\n12. Dead - LOPTr s/c & replacement lasted 5 mins\t\n-Line drive wfm dist - L5519 3ｵ3 in series with o/p from line timebase chip shorted turns\n\n13. Dead - low o/p from psu\t\n-R3610 & R3613 faulty - caused by D6610 zener in FET gate faulty\n\n14. Dead - no 95v from PSU.\t\n-D6638 ( BZX79-B36 ) s/c.\n\n15. Dead - no line osc\t\n-D6030 12v zener o/c\n\n16. Dead - pri HT only\t\n-Loptx o/c winding 1/5\n\n17. Dead - psu not starting HT = 15v\t\n-D6613 15v zener - checked ok out of cct\n\n18. Dead - psu shutdown\t\n-s/c between pins 1 & 6 of Loptx - replaced\n\n19. Dead - tripped due to high HT\t\n-R3610 330k in psu hi res\n\n20. DEAD 95v RAIL AT 5v\t\n-D6671 4v3 US\n\n21. DEAD LOP TRANSISTOR SC REPLACEMENT BLOWS AFTER 5min\t\n-L5519 ( LINE DRIVE ) OR LOPTX\n\n22. Dead set - psu OK\t\n-Micro not working but replacement didn't cure - unplug Txt panel got set working - IC7880 PCA84C81AP/098 u/s\n\n23. Dead with burning smell\t\n-BUT11AF lop tr & dry joints scan coil connector etc\n\n24. Dead with HT only 1.5v & PSU whistles\t-Replace 6641 SF2D41 protection thyristor\n\n25. DEAD WITH LED FLASHING AFTER A FEW SECS\t-IF NOT LOPT , MAY BE D6613 15v ZENER\n\n26. Dead with low freq sound\t\n- 95v HT ok but 9v start up only 5v \n- Loptx faulty FAT30057\n\n27. Dead with slight hum - 95v HT at LOPTr\t-L5524 coil o/c in line dr stage\n\n28. Dead with st/by light flashing - PSU OK\n-No line drive or start up volts pin 16 TDA2579 timebase gen \n- R3455 1k safety feed res high res\n\n29. Dead.\t\n-D6610 ( BZX79C10 ) zener.\n\n30. Set fails to start-up from standby mode, or at cold temperature.\t\n-Change C2058 from 33 uF to 47 uF 100V \n\n31. Set is intermittently not coming on, especially from cold.\t-High Tension coming up to normal voltage but there is no line drive. Check start up pulse to line osc IC - pin 11 of IC 7020. If OK, check to see if line drive appears for an instant at switch on, on pin 26. If so, check on base of line output transist\n\n32. Set will not come out of standby\t\n-Check/replace the EPROM, IC7785 (ST24C02CP; 4822 209 62098) \n\n33. Shuts once in a while and goes to stand-by.\t-Check C2631 (22nF; 4822 122 30103) on leakage. \n\n34. Slow start up fropm cold with no OSD\t\n-TR7765 (BC548) s/c between B-E, C2523-68uF","cbCaime0NVmYfsg1","https://ap.wps.com/l/cbCaime0NVmYfsg1","txt",3098,"English","# Dead Troubleshooting\n## Common Dead and No-Line-Osc Symptoms\n## HT/95V Low or Missing Conditions\n## LOP/Line-Drive Protection and Short-Circuit Causes\n## Startup/Standby, EPROM, and Intermittent Power Issues","[{\"question\":\"What checks are recommended when the set is dead with no line oscillation?\",\"answer\":\"Verify the startup and line-osc inputs, then check relevant capacitors and zener components such as C2519 (150pF), the 12V zener at pin 26 with TDA8305, and the noted Zener/zener-related parts listed in the checklist.\"},{\"question\":\"How should low or missing 95V/HT rails be diagnosed in this log?\",\"answer\":\"Check the HT/95V rail at the PSU, then inspect the specified zeners and capacitors (including parts like D6610/D6613 and C2618), and confirm whether the HT rises correctly before proceeding to the line-drive stage.\"},{\"question\":\"What actions are suggested for sets that won’t exit standby or fail to start from cold?\",\"answer\":\"Inspect the standby-to-on path: change or verify the EPROM (IC7785 ST24C02CP) for standby exit failures and replace startup capacitance such as C2058 (33uF to 47uF 100V) when cold-start issues occur.\"}]","PH GR1AX - Dead Troubleshooting | TXT",1791804495]