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It covers issues such as no sound when warm, picture loss, crackling in speakers, excessive heat in a thyristor, intermittent protection circuit operation, tuning/search problems, and various display abnormalities (stripes, blank screen, distorted lines, screen behavior on switch-off). Remedies include replacing specific components on designated boards, adjusting resistor/capacitor values, reworking cables and earth connections, and applying production changes by week or software version (e.g., TDA4680, NICAM ICs).",{"@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":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/philips-gr21-fault-list-symptoms-and-cures/559939/",{"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/philips-gr21-fault-list-symptoms-and-cures/559939.png","ImageObject",300,407,{"name":92,"@type":93},"\tJames","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/octet-stream","2026-10-13","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What should be checked when there is no sound after the set warms up?","Question",{"text":112,"@type":113},"Check for a defective IC7309 (TDA4680) and blocks that interfere with the IIC bus; replace the defective IC.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What repair is recommended when the picture disappears and there is no sound?",{"text":117,"@type":113},"Inspect the flat cable connections to the horizontal deflection coil and RGB flat cable; keep the horizontal deflection coil cable at the correct distance from the RGB flat cable to the picture tube base board.",{"name":119,"@type":110,"acceptedAnswer":120},"How can memory-related channel problems be addressed?",{"text":121,"@type":113},"The cures mention that the IIC bus is low at 15-second intervals; replacing the NICAM unit helps, improving how new channels are taken into memory.","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},559939,1791907456,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":34,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":66,"faqs":140,"seo_title":141,"seo_description":67,"update_tm":142,"read_time":143},2336474466412,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","PHILIPS GR2.1 hibák\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: No sound when the set is warm, led blinks \u000bCURE: Defective IC7309 (TDA4680; 4822 209 31592) blocks IIC bus.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Picture disappears, no sound \u000bCURE: Flat cable to horizontal deflection coil is too close to RGB flat cable to picture tube base board.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Crackling noise in left loudspeaker. \u000bCURE: Replace R3214 on NICAM IF board by special resistor 4822 116 83726. Also resolder all 6 components around 7217.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Thyristor TH6670 (SROR5043) warms too much \u000bCURE: Change the value of R3663 to 5k6 (4822 051 10688).\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Protection circuit working from time to time \u000bCURE: Diode 6592 (LL2C30; 4822 130 80928) leaks. Voltage to protection circuit was ca. 400 mV, it should be 28...23 mV.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Poor search tuning in monosets in cable network \u000bCURE: Add elco 1uF/16V (4822 124 40242) from item R3714/R3755 to earth. Place capacitor to item 2707.Capacitor will not be added in production, which has ended.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: During search UHF channels 27, 38, 44 and 45 are thrown away. \u000bCURE: Add elco 1uF/16V (4822 124 40242) from item R3714/R3755 to earth. Place capacitor to item 2707.Capacitor will not be added in production, which has ended.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Whistling LOT. Discharge is audible. Loudness depends on picture. \u000bCURE: As a result line output transistor becomes defective. Break earth pin A. This pin connects ferrite core to earth via spring. Cut as close to the plastic holder as possible. This pin is not in the Service Manual. REMARKS : From week 9223 onwards transformers are without this pin. They are stamped 37952 (4822 140 10414) and 37992 (4822 140 10417).\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: No sound, no functions and no picture. \u000bCURE: On firstly checking the power supply this proved to be OK. On then checking the power on reset circuit, this was identified to be fault. Replacing D6665 (4.7V Zener; 4822 130 80883) and T7663 (BC858; 4822 130 42513) restored operation.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: S in screen, cannot go from service mode. \u000bCURE: Diode 6705 (BZV55; 4822 130 80914) leaks.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Does not take (new) channels into memory \u000bCURE: IIC bus were low in 15 s intervals. Replacing NICAM unit helps.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Dark screen, LED blinks \u000bCURE: If the LED obeys RC, uP is OK. Fault in power supply or TDA4680 (IC7309; 4822 209 63733). The problem occurs in sets produced in the beginning of the series. There is no problem if the software is MR5.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Bended horizontal lines at top and bottom of the picture \u000bCURE: Mount correctionmodule 4822 212 31384 (seagull), and do the alignments on this module.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Does not start from cold situation. \u000bCURE: Replace resistors R3610 (15B). R3624 (330K) and R3625 (560K): R3624330K 1W 5% TOL 4822 053 10334 R3625560K 0.5W 5% TOL 4822 053 21564 R3610 (4822 050 25601) 10R (Safety) 4822 052 10109 Add resistor of 560R in parallel with C2660 4822 050 25601 In cases of specific complaint these changes can be applied as a service solution to earlier sets, in which case the 560R resistor can be fitted across C2660 on the print side of the panel.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Sound mute on cable networks and with some VCRs. \u000bCURE: Remove R3064 on stereo IF module, replace R3065 by 4K7 (4822 051 10472). Add on R3070 8K2 (4822 051 10822).\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: Set does not start up from standby \u000bCURE: The following change has been introduced in production : Position OldNew Code no. R36634K75K6 4822 051 10562 R36741K11K4822 050 11002 D6670SFOR5043 TAGE0102AA4822 130 20272 IC7624 CNR50selected4822 209 30992 version Introduced from week 9142 onwards. In cases of specific complaint this change can be applied as a service solution.\nMODEL/CHASSIS: GR2.1 \u000bSYMPTOM: No start voltage on pin 7 and 8 of IC7600 \u000bCURE","cbCaitUtxi8C5bb0","https://ap.wps.com/l/cbCaitUtxi8C5bb0","doc",103424,"English","[{\"question\":\"What should be checked when there is no sound after the set warms up?\",\"answer\":\"Check for a defective IC7309 (TDA4680) and blocks that interfere with the IIC bus; replace the defective IC.\"},{\"question\":\"What repair is recommended when the picture disappears and there is no sound?\",\"answer\":\"Inspect the flat cable connections to the horizontal deflection coil and RGB flat cable; keep the horizontal deflection coil cable at the correct distance from the RGB flat cable to the picture tube base board.\"},{\"question\":\"How can memory-related channel problems be addressed?\",\"answer\":\"The cures mention that the IIC bus is low at 15-second intervals; replacing the NICAM unit helps, improving how new channels are taken into memory.\"}]","PHILIPS GR2.1 hibák - symptom and cure list | DOC",1791801584,18]